MC68HRC98JK1ECP [MOTOROLA]
Microcontrollers; 微控制器
| 型号： | MC68HRC98JK1ECP |
| 厂家： | 
MOTOROLA |
| 描述： | Microcontrollers |
| 文件： | 总226页 (文件大小：1479K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MC68HC908JL3E
MC68HC908JK3E
MC68HC908JK1E
MC68HRC908JL3E
MC68HRC908JK3E
MC68HRC908JK1E
MC68HLC908JL3E
MC68HLC908JK3E
MC68HLC908JK1E
Technical Data
M68HC08
Microcontrollers
MC68HC908JL3E/D
Rev. 2, 12/2002
MOTOROLA.COM/SEMICONDUCTORS
MC68HC908JL3E/JK3E/JK1E
MC68HRC908JL3E/JK3E/JK1E
MC68HLC908JL3E/JK3E/JK1E
Technical Data
Motorola reserves the right to make changes without further notice to any products
herein. Motorola makes no warranty, representation or guarantee regarding the
suitability of its products for any particular purpose, nor does Motorola assume any
liability arising out of the application or use of any product or circuit, and specifically
disclaims any and all liability, including without limitation consequential or incidental
damages. “Typical” parameters which may be provided in Motorola data sheets and/or
specifications can and do vary in different applications and actual performance may
vary over time. All operating parameters, including “Typicals” must be validated for
each customer application by customer's technical experts. Motorola does not convey
any license under its patent rights nor the rights of others. Motorola products are not
designed, intended, or authorized for use as components in systems intended for
surgical implant into the body, or other applications intended to support or sustain life,
or for any other application in which the failure of the Motorola product could create a
situation where personal injury or death may occur. Should Buyer purchase or use
Motorola products for any such unintended or unauthorized application, Buyer shall
indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and
distributors harmless against all claims, costs, damages, and expenses, and
reasonable attorney fees arising out of, directly or indirectly, any claim of personal
injury or death associated with such unintended or unauthorized use, even if such claim
alleges that Motorola was negligent regarding the design or manufacture of the part.
Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer.
Motorola and the Stylized M logo are registered in the U.S. Patent and Trademark Office.
digital dna is a trademark of Motorola, Inc.
© Motorola, Inc., 2002
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
3
Revision History
To provide the most up-to-date information, the revision of our
documents on the World Wide Web will be the most current. Your printed
copy may be an earlier revision. To verify you have the latest information
available, refer to:
http://motorola.com/semiconductors
The following revision history table summarizes changes contained in
this document. For your convenience, the page number designators
have been linked to the appropriate location.
Revision History
Revision
Level
Page
Date
Description
Number(s)
Added appendix A for low-volt devices.
217–224
109, 110
—
Updated Monitor Mode Circuit (Figure 9-1) and Monitor Mode
Entry Requirements and Options (Table 9-1) in Monitor ROM
section.
Dec 2002
May 2002
2
1
First general release.
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Technical Data – MC68H(R)C908JL3E/JK3E/JK1E
List of Sections
Section 1. General Description . . . . . . . . . . . . . . . . . . . .23
Section 2. Memory Map . . . . . . . . . . . . . . . . . . . . . . . . . .31
Section 3. Random-Access Memory (RAM) . . . . . . . . . .41
Section 4. FLASH Memory (FLASH) . . . . . . . . . . . . . . . .43
Section 5. Configuration Register (CONFIG) . . . . . . . . .53
Section 6. Central Processor Unit (CPU) . . . . . . . . . . . .57
Section 7. System Integration Module (SIM) . . . . . . . . .77
Section 8. Oscillator (OSC) . . . . . . . . . . . . . . . . . . . . . .101
Section 9. Monitor ROM (MON) . . . . . . . . . . . . . . . . . . .107
Section 10. Timer Interface Module (TIM) . . . . . . . . . . .121
Section 11. Analog-to-Digital Converter (ADC) . . . . . .143
Section 12. Input/Output (I/O) Ports . . . . . . . . . . . . . . .153
Section 13. External Interrupt (IRQ) . . . . . . . . . . . . . . .165
Section 14. Keyboard Interrupt Module (KBI). . . . . . . .171
Section 15. Computer Operating Properly (COP) . . . .179
Section 16. Low Voltage Inhibit (LVI) . . . . . . . . . . . . . .185
Section 17. Break Module (BREAK) . . . . . . . . . . . . . . .189
Section 18. Electrical Specifications. . . . . . . . . . . . . . .197
Section 19. Mechanical Specifications . . . . . . . . . . . . .209
Section 20. Ordering Information . . . . . . . . . . . . . . . . .213
Appendix A. MC68HLC908JL3E/JK3E/JK1E. . . . . . . . .217
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List of Sections
List of Sections
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List of Sections
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Table of Contents
Section 1. General Description
1.1
1.2
1.3
1.4
1.5
1.6
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
MCU Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Pin Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Section 2. Memory Map
2.1
2.2
2.3
2.4
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
I/O Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Monitor ROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Section 3. Random-Access Memory (RAM)
3.1
3.2
3.3
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Section 4. FLASH Memory (FLASH)
4.1
4.2
4.3
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
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Table of Contents
4.4
4.5
4.6
4.7
4.8
4.9
FLASH Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
FLASH Page Erase Operation . . . . . . . . . . . . . . . . . . . . . . . . .46
FLASH Mass Erase Operation . . . . . . . . . . . . . . . . . . . . . . . . .47
FLASH Program Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . .48
FLASH Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
FLASH Block Protect Register . . . . . . . . . . . . . . . . . . . . . . . . .50
Section 5. Configuration Register (CONFIG)
5.1
5.2
5.3
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Section 6. Central Processor Unit (CPU)
6.1
6.2
6.3
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
6.4
CPU Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
Accumulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
Index Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
Stack Pointer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
Program Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
Condition Code Register . . . . . . . . . . . . . . . . . . . . . . . . . . .62
6.4.1
6.4.2
6.4.3
6.4.4
6.4.5
6.5
Arithmetic/Logic Unit (ALU) . . . . . . . . . . . . . . . . . . . . . . . . . . .64
6.6
6.6.1
6.6.2
Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
6.7
6.8
6.9
CPU During Break Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . .65
Instruction Set Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
Opcode Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
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Table of Contents
Section 7. System Integration Module (SIM)
7.1
7.2
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78
7.3
SIM Bus Clock Control and Generation . . . . . . . . . . . . . . . . . .81
Bus Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81
Clock Start-Up from POR. . . . . . . . . . . . . . . . . . . . . . . . . . .81
Clocks in Stop Mode and Wait Mode . . . . . . . . . . . . . . . . . .81
7.3.1
7.3.2
7.3.3
7.4
7.4.1
7.4.2
7.4.2.1
7.4.2.2
7.4.2.3
7.4.2.4
7.4.2.5
Reset and System Initialization. . . . . . . . . . . . . . . . . . . . . . . . .82
External Pin Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82
Active Resets from Internal Sources . . . . . . . . . . . . . . . . . .83
Power-On Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84
Computer Operating Properly (COP) Reset. . . . . . . . . . .85
Illegal Opcode Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . .85
Illegal Address Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . .85
LVI Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86
7.5
SIM Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86
SIM Counter During Power-On Reset . . . . . . . . . . . . . . . . .86
SIM Counter During Stop Mode Recovery. . . . . . . . . . . . . .86
SIM Counter and Reset States. . . . . . . . . . . . . . . . . . . . . . .87
7.5.1
7.5.2
7.5.3
7.6
7.6.1
Exception Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87
Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87
Hardware Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89
SWI Instruction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91
Interrupt Status Registers. . . . . . . . . . . . . . . . . . . . . . . . . . .91
Interrupt Status Register 1 . . . . . . . . . . . . . . . . . . . . . . .92
Interrupt Status Register 2. . . . . . . . . . . . . . . . . . . . . . . .92
Interrupt Status Register 3. . . . . . . . . . . . . . . . . . . . . . . .93
Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93
Break Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93
Status Flag Protection in Break Mode . . . . . . . . . . . . . . . . .94
7.6.1.1
7.6.1.2
7.6.2
7.6.2.1
7.6.2.2
7.6.2.3
7.6.3
7.6.4
7.6.5
7.7
7.7.1
7.7.2
Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94
Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96
7.8
SIM Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97
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7.8.1
7.8.2
7.8.3
Break Status Register (BSR) . . . . . . . . . . . . . . . . . . . . . . . .97
Reset Status Register (RSR) . . . . . . . . . . . . . . . . . . . . . . . .98
Break Flag Control Register (BFCR) . . . . . . . . . . . . . . . . .100
Section 8. Oscillator (OSC)
8.1
8.2
8.3
8.4
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .101
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .101
X-tal Oscillator (MC68HC908JL3E/JK3E/JK1E). . . . . . . . . . .102
RC Oscillator (MC68HRC908JL3E/JK3E/JK1E) . . . . . . . . . .103
8.5
I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .104
Crystal Amplifier Input Pin (OSC1). . . . . . . . . . . . . . . . . . .104
Crystal Amplifier Output Pin (OSC2/PTA6/RCCLK). . . . . .104
Oscillator Enable Signal (SIMOSCEN). . . . . . . . . . . . . . . .104
X-tal Oscillator Clock (XTALCLK). . . . . . . . . . . . . . . . . . . .104
RC Oscillator Clock (RCCLK). . . . . . . . . . . . . . . . . . . . . . .105
Oscillator Out 2 (2OSCOUT) . . . . . . . . . . . . . . . . . . . . . . .105
Oscillator Out (OSCOUT). . . . . . . . . . . . . . . . . . . . . . . . . .105
8.5.1
8.5.2
8.5.3
8.5.4
8.5.5
8.5.6
8.5.7
8.6
8.6.1
8.6.2
Low Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105
Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105
8.7
Oscillator During Break Mode. . . . . . . . . . . . . . . . . . . . . . . . .106
Section 9. Monitor ROM (MON)
9.1
9.2
9.3
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .107
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .107
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .108
9.4
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .108
Entering Monitor Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . .110
Baud Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .113
Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .114
Echoing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .114
Break Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .115
9.4.1
9.4.2
9.4.3
9.4.4
9.4.5
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9.4.6
9.5
Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .115
Security. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .119
Section 10. Timer Interface Module (TIM)
10.1 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .121
10.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .122
10.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .122
10.4 Pin Name Conventions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .122
10.5 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .123
10.5.1 TIM Counter Prescaler . . . . . . . . . . . . . . . . . . . . . . . . . . . .125
10.5.2 Input Capture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .125
10.5.3 Output Compare. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .125
10.5.3.1
10.5.3.2
Unbuffered Output Compare . . . . . . . . . . . . . . . . . . . . .126
Buffered Output Compare . . . . . . . . . . . . . . . . . . . . . . .127
10.5.4 Pulse Width Modulation (PWM) . . . . . . . . . . . . . . . . . . . . .127
10.5.4.1
10.5.4.2
10.5.4.3
Unbuffered PWM Signal Generation . . . . . . . . . . . . . . .128
Buffered PWM Signal Generation . . . . . . . . . . . . . . . . .129
PWM Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . .130
10.6 Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .131
10.7 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .131
10.7.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .132
10.7.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .132
10.8 TIM During Break Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . .132
10.9 I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .133
10.10 I/O Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .133
10.10.1 TIM Status and Control Register (TSC) . . . . . . . . . . . . . . .134
10.10.2 TIM Counter Registers (TCNTH:TCNTL). . . . . . . . . . . . . .136
10.10.3 TIM Counter Modulo Registers (TMODH:TMODL) . . . . . .137
10.10.4 TIM Channel Status and Control Registers (TSC0:TSC1).138
10.10.5 TIM Channel Registers (TCH0H/L:TCH1H/L) . . . . . . . . . .142
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Section 11. Analog-to-Digital Converter (ADC)
11.1 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .143
11.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .143
11.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .144
11.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .144
11.4.1 ADC Port I/O Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .145
11.4.2 Voltage Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .146
11.4.3 Conversion Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .146
11.4.4 Continuous Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . .146
11.4.5 Accuracy and Precision . . . . . . . . . . . . . . . . . . . . . . . . . . .147
11.5 Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .147
11.6 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .147
11.6.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .147
11.6.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .147
11.7 I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .147
11.7.1 ADC Voltage In (ADCVIN) . . . . . . . . . . . . . . . . . . . . . . . . .148
11.8 I/O Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .148
11.8.1 ADC Status and Control Register. . . . . . . . . . . . . . . . . . . .148
11.8.2 ADC Data Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .151
11.8.3 ADC Input Clock Register . . . . . . . . . . . . . . . . . . . . . . . . .151
Section 12. Input/Output (I/O) Ports
12.1 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .153
12.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .153
12.3 Port A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .156
12.3.1 Port A Data Register (PTA) . . . . . . . . . . . . . . . . . . . . . . . .156
12.3.2 Data Direction Register A (DDRA) . . . . . . . . . . . . . . . . . . .157
12.3.3 Port A Input Pull-up Enable Register (PTAPUE) . . . . . . . .158
12.4 Port B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .159
12.4.1 Port B Data Register (PTB) . . . . . . . . . . . . . . . . . . . . . . . .159
12.4.2 Data Direction Register B (DDRB) . . . . . . . . . . . . . . . . . . .160
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12.5 Port D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .161
12.5.1 Port D Data Register (PTD) . . . . . . . . . . . . . . . . . . . . . . . .162
12.5.2 Data Direction Register D (DDRD). . . . . . . . . . . . . . . . . . .163
12.5.3 Port D Control Register (PDCR). . . . . . . . . . . . . . . . . . . . .164
Section 13. External Interrupt (IRQ)
13.1 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .165
13.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .165
13.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .165
13.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .166
13.4.1 IRQ1 Pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .167
13.5 IRQ Module During Break Interrupts . . . . . . . . . . . . . . . . . . .169
13.6 IRQ Status and Control Register (INTSCR) . . . . . . . . . . . . . .169
Section 14. Keyboard Interrupt Module (KBI)
14.1 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .171
14.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .171
14.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .171
14.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .172
14.4.1 Keyboard Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . .174
14.4.2 Keyboard Status and Control Register. . . . . . . . . . . . . . . .175
14.4.3 Keyboard Interrupt Enable Register. . . . . . . . . . . . . . . . . .176
14.5 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .177
14.5.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .177
14.5.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .177
14.6 Keyboard Module During Break Interrupts . . . . . . . . . . . . . . .177
Section 15. Computer Operating Properly (COP)
15.1 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .179
15.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .179
15.3 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .180
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15.4 I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .181
15.4.1 2OSCOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .181
15.4.2 COPCTL Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .181
15.4.3 Power-On Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .181
15.4.4 Internal Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .181
15.4.5 Reset Vector Fetch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .182
15.4.6 COPD (COP Disable). . . . . . . . . . . . . . . . . . . . . . . . . . . . .182
15.4.7 COPRS (COP Rate Select) . . . . . . . . . . . . . . . . . . . . . . . .182
15.5 COP Control Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .183
15.6 Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .183
15.7 Monitor Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .183
15.8 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .183
15.8.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .183
15.8.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .184
15.9 COP Module During Break Mode . . . . . . . . . . . . . . . . . . . . . .184
Section 16. Low Voltage Inhibit (LVI)
16.1 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .185
16.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .185
16.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .185
16.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .186
16.5 LVI Control Register (CONFIG2/CONFIG1). . . . . . . . . . . . . .186
16.6 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .187
16.6.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .187
16.6.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .187
Section 17. Break Module (BREAK)
17.1 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .189
17.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .189
17.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .190
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17.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .190
17.4.1 Flag Protection During Break Interrupts. . . . . . . . . . . . . . .192
17.4.2 CPU During Break Interrupts . . . . . . . . . . . . . . . . . . . . . . .192
17.4.3 TIM During Break Interrupts. . . . . . . . . . . . . . . . . . . . . . . .192
17.4.4 COP During Break Interrupts . . . . . . . . . . . . . . . . . . . . . . .192
17.5 Break Module Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . .192
17.5.1 Break Status and Control Register (BRKSCR) . . . . . . . . .193
17.5.2 Break Address Registers . . . . . . . . . . . . . . . . . . . . . . . . . .194
17.5.3 Break Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . .194
17.5.4 Break Flag Control Register (BFCR) . . . . . . . . . . . . . . . . .196
17.6 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .196
17.6.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .196
17.6.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .196
Section 18. Electrical Specifications
18.1 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .197
18.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .197
18.3 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . .198
18.4 Functional Operating Range. . . . . . . . . . . . . . . . . . . . . . . . . .199
18.5 Thermal Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . .199
18.6 5V DC Electrical Characteristics. . . . . . . . . . . . . . . . . . . . . . .200
18.7 5V Control Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .201
18.8 5V Oscillator Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . .202
18.9 3V DC Electrical Characteristics. . . . . . . . . . . . . . . . . . . . . . .203
18.10 3V Control Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .204
18.11 3V Oscillator Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . .205
18.12 Typical Supply Currents . . . . . . . . . . . . . . . . . . . . . . . . . . . . .206
18.13 ADC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .208
18.14 Memory Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . .209
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Section 19. Mechanical Specifications
19.1 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .211
19.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .211
19.3 20-Pin PDIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .212
19.4 20-Pin SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .212
19.5 28-Pin PDIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .213
19.6 28-Pin SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .213
19.7 48-Pin LQFP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .214
Section 20. Ordering Information
20.1 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .215
20.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .215
20.3 MC Order Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .216
Appendix A. MC68HLC908JL3E/JK3E/JK1E
A.1
A.2
A.3
A.4
A.5
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .217
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .217
FLASH Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218
Low-Voltage Inhibit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218
Oscillator Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218
A.6
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218
Functional Operating Range . . . . . . . . . . . . . . . . . . . . . . .218
DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . .219
Control Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .220
Oscillator Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . .220
ADC Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .221
Memory Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . .222
A.6.1
A.6.2
A.6.3
A.6.4
A.6.5
A.6.6
A.7
MC Order Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .223
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List of Figures
Figure
Title
Page
1-1
1-2
1-3
1-4
MCU Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
28-Pin PDIP/SOIC Pin Assignment . . . . . . . . . . . . . . . . . . . . .27
20-Pin PDIP/SOIC Pin Assignment . . . . . . . . . . . . . . . . . . . . .27
48-Pin LQFP Pin Assignment. . . . . . . . . . . . . . . . . . . . . . . . . .28
2-1
2-2
Memory Map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Control, Status, and Data Registers . . . . . . . . . . . . . . . . . . . . .34
4-1
4-2
4-3
4-4
FLASH I/O Register Summary . . . . . . . . . . . . . . . . . . . . . . . . .44
FLASH Control Register (FLCR) . . . . . . . . . . . . . . . . . . . . . . .45
FLASH Programming Flowchart. . . . . . . . . . . . . . . . . . . . . . . .49
FLASH Block Protect Register (FLBPR). . . . . . . . . . . . . . . . . .50
5-1
5-2
6-1
Configuration Register 2 (CONFIG2) . . . . . . . . . . . . . . . . . . . .54
Configuration Register 1 (CONFIG1) . . . . . . . . . . . . . . . . . . . .55
CPU Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
6-2
6-3
6-4
6-5
6-6
Accumulator (A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
Index Register (H:X) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
Stack Pointer (SP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
Program Counter (PC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
Condition Code Register (CCR) . . . . . . . . . . . . . . . . . . . . . . . .62
7-1
7-2
7-3
7-4
7-5
7-6
7-7
SIM Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
SIM I/O Register Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . .80
SIM Clock Signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81
External Reset Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82
Internal Reset Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83
Sources of Internal Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83
POR Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84
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Figure
Title
Page
7-8
7-9
Interrupt Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .88
Interrupt Entry. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89
7-10 Interrupt Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89
7-11 Interrupt Recognition Example . . . . . . . . . . . . . . . . . . . . . . . . .90
7-12 Interrupt Status Register 1 (INT1). . . . . . . . . . . . . . . . . . . . . . .92
7-13 Interrupt Status Register 2 (INT2). . . . . . . . . . . . . . . . . . . . . . .92
7-14 Interrupt Status Register 3 (INT3). . . . . . . . . . . . . . . . . . . . . . .93
7-15 Wait Mode Entry Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .95
7-16 Wait Recovery from Interrupt or Break . . . . . . . . . . . . . . . . . . .95
7-17 Wait Recovery from Internal Reset. . . . . . . . . . . . . . . . . . . . . .95
7-18 Stop Mode Entry Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96
7-19 Stop Mode Recovery from Interrupt or Break. . . . . . . . . . . . . .97
7-20 Break Status Register (BSR) . . . . . . . . . . . . . . . . . . . . . . . . . .97
7-21 Reset Status Register (RSR) . . . . . . . . . . . . . . . . . . . . . . . . . .99
7-22 Break Flag Control Register (BFCR) . . . . . . . . . . . . . . . . . . .100
8-1
8-2
X-tal Oscillator External Connections . . . . . . . . . . . . . . . . . . .102
RC Oscillator External Connections . . . . . . . . . . . . . . . . . . . .103
9-1
9-2
9-3
9-4
9-5
9-6
9-7
Monitor Mode Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .109
Low-Voltage Monitor Mode Entry Flowchart. . . . . . . . . . . . . .112
Monitor Data Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .114
Sample Monitor Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . .114
Read Transaction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .114
Break Transaction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .115
Monitor Mode Entry Timing. . . . . . . . . . . . . . . . . . . . . . . . . . .119
10-1 TIM Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .123
10-2 TIM I/O Register Summary. . . . . . . . . . . . . . . . . . . . . . . . . . .124
10-3 PWM Period and Pulse Width . . . . . . . . . . . . . . . . . . . . . . . .128
10-4 TIM Status and Control Register (TSC) . . . . . . . . . . . . . . . . .134
10-5 TIM Counter Registers (TCNTH:TCNTL) . . . . . . . . . . . . . . . .136
10-6 TIM Counter Modulo Registers (TMODH:TMODL). . . . . . . . .137
10-7 TIM Channel Status and Control Registers (TSC0:TSC1) . . .138
10-8 CHxMAX Latency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .141
10-9 TIM Channel Registers (TCH0H/L:TCH1H/L). . . . . . . . . . . . .142
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Page
11-1 ADC I/O Register Summary . . . . . . . . . . . . . . . . . . . . . . . . . .144
11-2 ADC Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .145
11-3 ADC Status and Control Register (ADSCR). . . . . . . . . . . . . .148
11-4 ADC Data Register (ADR) . . . . . . . . . . . . . . . . . . . . . . . . . . .151
11-5 ADC Input Clock Register (ADICLK) . . . . . . . . . . . . . . . . . . .151
12-1 I/O Port Register Summary. . . . . . . . . . . . . . . . . . . . . . . . . . .154
12-2 Port A Data Register (PTA) . . . . . . . . . . . . . . . . . . . . . . . . . .156
12-3 Data Direction Register A (DDRA) . . . . . . . . . . . . . . . . . . . . .157
12-4 Port A I/O Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .157
12-5 Port A Input Pull-up Enable Register (PTAPUE) . . . . . . . . . .158
12-6 Port B Data Register (PTB) . . . . . . . . . . . . . . . . . . . . . . . . . .159
12-7 Data Direction Register B (DDRB) . . . . . . . . . . . . . . . . . . . . .160
12-8 Port B I/O Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .161
12-9 Port D Data Register (PTD) . . . . . . . . . . . . . . . . . . . . . . . . . .162
12-10 Data Direction Register D (DDRD) . . . . . . . . . . . . . . . . . . . . .163
12-11 Port D I/O Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .163
12-12 Port D Control Register (PDCR). . . . . . . . . . . . . . . . . . . . . . .164
13-1 IRQ Module Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . .167
13-2 IRQ I/O Register Summary. . . . . . . . . . . . . . . . . . . . . . . . . . .167
13-3 IRQ Status and Control Register (INTSCR) . . . . . . . . . . . . . .169
13-4 Configuration Register 2 (CONFIG2) . . . . . . . . . . . . . . . . . . .170
14-1 KBI I/O Register Summary . . . . . . . . . . . . . . . . . . . . . . . . . . .172
14-2 Keyboard Interrupt Block Diagram . . . . . . . . . . . . . . . . . . . . .172
14-3 Keyboard Status and Control Register (KBSCR) . . . . . . . . . .175
14-4 Keyboard Interrupt Enable Register (KBIER) . . . . . . . . . . . . .176
15-1 COP Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .180
15-2 Configuration Register 1 (CONFIG1) . . . . . . . . . . . . . . . . . . .182
15-3 COP Control Register (COPCTL). . . . . . . . . . . . . . . . . . . . . .183
16-1 LVI Module Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . .186
16-2 Configuration Register 2 (CONFIG2) . . . . . . . . . . . . . . . . . . .186
16-3 Configuration Register 1 (CONFIG1) . . . . . . . . . . . . . . . . . . .187
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
19
List of Figures
List of Figures
Figure
Title
Page
17-1 Break Module Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . .191
17-2 Break I/O Register Summary . . . . . . . . . . . . . . . . . . . . . . . . .191
17-3 Break Status and Control Register (BRKSCR). . . . . . . . . . . .193
17-4 Break Address Register High (BRKH) . . . . . . . . . . . . . . . . . .194
17-5 Break Address Register Low (BRKL) . . . . . . . . . . . . . . . . . . .194
17-6 Break Status Register (BSR) . . . . . . . . . . . . . . . . . . . . . . . . .194
17-7 Break Flag Control Register (BFCR) . . . . . . . . . . . . . . . . . . .196
18-1 RC vs. Frequency (5V @25°C) . . . . . . . . . . . . . . . . . . . . . . .202
18-2 RC vs. Frequency (3V @25°C) . . . . . . . . . . . . . . . . . . . . . . .205
18-3 Typical Operating IDD (MC68HC908JL3E/JK3E/JK1E),
with All Modules Turned On (25 °C) . . . . . . . . . . . . . . . . .206
18-4 Typical Operating IDD (MC68HRC908JL3E/JK3E/JK1E),
with All Modules Turned On (25 °C) . . . . . . . . . . . . . . . . .206
18-5 Typical Wait Mode IDD (MC68HC908JL3E/JK3E/JK1E),
with All Modules Turned Off (25 °C) . . . . . . . . . . . . . . . . .207
18-6 Typical Wait Mode IDD (MC68HRC908JL3E/JK3E/JK1E),
with All Modules Turned Off (25 °C) . . . . . . . . . . . . . . . . .207
19-1 20-Pin PDIP (Case #738) . . . . . . . . . . . . . . . . . . . . . . . . . . . .212
19-2 20-Pin SOIC (Case #751D) . . . . . . . . . . . . . . . . . . . . . . . . . .212
19-3 28-Pin PDIP (Case #710) . . . . . . . . . . . . . . . . . . . . . . . . . . . .213
19-4 28-Pin SOIC (Case #751F). . . . . . . . . . . . . . . . . . . . . . . . . . .213
19-5 48-Pin LQFP (Case #932) . . . . . . . . . . . . . . . . . . . . . . . . . . .214
Technical Data
20
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
List of Figures
MOTOROLA
Technical Data – MC68H(R)C908JL3E/JK3E/JK1E
List of Tables
Table
Title
Page
1-1
1-2
Summary of Device Variations . . . . . . . . . . . . . . . . . . . . . . . . .23
Pin Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
2-1
Vector Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
6-1
6-2
Instruction Set Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
Opcode Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
7-1
7-2
7-3
7-4
Signal Name Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
PIN Bit Set Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82
Interrupt Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91
SIM Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97
9-1
9-2
9-3
9-4
9-5
9-6
9-7
9-8
9-9
Monitor Mode Entry Requirements and Options. . . . . . . . . . .110
Monitor Mode Vector Differences . . . . . . . . . . . . . . . . . . . . . .113
Monitor Baud Rate Selection . . . . . . . . . . . . . . . . . . . . . . . . .113
READ (Read Memory) Command . . . . . . . . . . . . . . . . . . . . .116
WRITE (Write Memory) Command. . . . . . . . . . . . . . . . . . . . .116
IREAD (Indexed Read) Command . . . . . . . . . . . . . . . . . . . . .117
IWRITE (Indexed Write) Command . . . . . . . . . . . . . . . . . . . .117
READSP (Read Stack Pointer) Command. . . . . . . . . . . . . . .118
RUN (Run User Program) Command. . . . . . . . . . . . . . . . . . .118
10-1 Pin Name Conventions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .122
10-2 Prescaler Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .135
10-3 Mode, Edge, and Level Selection. . . . . . . . . . . . . . . . . . . . . .140
11-1 MUX Channel Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .150
11-2 ADC Clock Divide Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . .152
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
21
List of Tables
List of Tables
Table
Title
Page
12-1 Port Control Register Bits Summary. . . . . . . . . . . . . . . . . . . .155
12-2 Port A Pin Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .159
12-3 Port B Pin Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .161
12-4 Port D Pin Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .164
18-1 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . .198
18-2 Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .199
18-3 Thermal Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . .199
18-4 DC Electrical Characteristics (5V) . . . . . . . . . . . . . . . . . . . . .200
18-5 Control Timing (5V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .201
18-6 Oscillator Component Specifications (5V) . . . . . . . . . . . . . . .202
18-7 DC Electrical Characteristics (3V) . . . . . . . . . . . . . . . . . . . . .203
18-8 Control Timing (3V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .204
18-9 Oscillator Component Specifications (3V) . . . . . . . . . . . . . . .205
18-10 ADC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .208
18-11 Memory Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . .209
20-1 MC Order Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .216
A-1 Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218
A-2 DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . .219
A-3 Control Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .220
A-4 Oscillator Component Specifications . . . . . . . . . . . . . . . . . . .220
A-5 ADC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .221
A-6 Memory Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . .222
A-7 MC68HLC908JL3E/JK3E/JK1E Order Numbers . . . . . . . . . .223
Technical Data
22
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
List of Tables
MOTOROLA
Technical Data – MC68H(R)C908JL3E/JK3E/JK1E
Section 1. General Description
1.1 Contents
1.2
1.3
1.4
1.5
1.6
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
MCU Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Pin Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
1.2 Introduction
The MC68H(R)C908JL3E is a member of the low-cost, high-
performance M68HC08 Family of 8-bit microcontroller units (MCUs).
The M68HC08 Family is based on the customer-specified integrated
circuit (CSIC) design strategy. All MCUs in the family use the enhanced
M68HC08 central processor unit (CPU08) and are available with a
variety of modules, memory sizes and types, and package types.
Table 1-1. Summary of Device Variations
Device
Oscillator Option
FLASH Memory Size
Pin Count
MC68HC908JL3E
MC68HRC908JL3E
MC68HC908JK3E
MC68HRC908JK3E
MC68HC908JK1E
MC68HRC908JK1E
X-TAL
RC
4096 bytes
28
X-TAL
RC
4096 bytes
1536 bytes
20
20
X-TAL
RC
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
23
General Description
General Description
All references to the MC68H(R)C908JL3E in this data book apply
equally to the MC68H(R)C908JK3E and MC68H(R)C908JK1E, unless
otherwise stated.
1.3 Features
Features of the MC68H(R)C908JL3E include the following:
• EMC enhanced version of MC68H(R)C908JL3/JK3/JK1
• High-performance M68HC08 architecture
• Fully upward-compatible object code with M6805, M146805, and
M68HC05 Families
• Low-power design; fully static with stop and wait modes
• Maximum internal bus frequency:
– 8-MHz at 5V operating voltage
– 4-MHz at 3V operating voltage
• Oscillator options:
– Crystal oscillator for MC68HC908JL3E/JK3E/JK1E
– RC oscillator for MC68HRC908JL3E/JK3E/JK1E
• User program FLASH memory with security1 feature
– 4,096 bytes for MC68H(R)C908JL3E/JK3E
– 1,536 bytes for MC68H(R)C908JK1E
• 128 bytes of on-chip RAM
• 2-channel, 16-bit timer interface module (TIM)
• 12-channel, 8-bit analog-to-digital converter (ADC)
• 23 general purpose I/O ports for MC68H(R)C908JL3E:
– 7 keyboard interrupt with internal pull-up
(6 keyboard interrupt for MC68HC908JL3E)
– 10 LED drivers (sink)
– 2 × 25mA open-drain I/O with pull-up
1. No security feature is absolutely secure. However, Motorola’s strategy is to make reading or
copying the FLASH difficult for unauthorized users.
Technical Data
24
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
General Description
MOTOROLA
General Description
Features
• 15 general purpose I/O ports for MC68H(R)C908JK3E/JK1E:
– 1 keyboard interrupt with internal pull-up
(MC68HRC908JK3E/JK1E only)
– 4 LED drivers (sink)
– 2 × 25mA open-drain I/O with pull-up
– 10-channel ADC
• System protection features:
– Optional computer operating properly (COP) reset
– Optional low-voltage detection with reset and selectable trip
points for 3V and 5V operation
– Illegal opcode detection with reset
– Illegal address detection with reset
• Master reset pin with internal pull-up and power-on reset
• IRQ1 with schmitt-trigger input and programmable pull-up
• 28-pin PDIP, 28-pin SOIC, and 48-pin LQFP packages for
MC68H(R)C908JL3E
• 20-pin PDIP and 20-pin SOIC packages for
MC68H(R)C908JK3E/JK1E
Features of the CPU08 include the following:
• Enhanced HC05 programming model
• Extensive loop control functions
• 16 addressing modes (eight more than the HC05)
• 16-bit index register and stack pointer
• Memory-to-memory data transfers
• Fast 8 × 8 multiply instruction
• Fast 16/8 divide instruction
• Binary-coded decimal (BCD) instructions
• Optimization for controller applications
• Efficient C language support
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
25
General Description
General Description
1.4 MCU Block Diagram
Figure 1-1 shows the structure of the MC68H(R)C908JL3E.
INTERNAL BUS
M68HC08 CPU
CPU
REGISTERS
ARITHMETIC/LOGIC
UNIT (ALU)
KEYBOARD INTERRUPT
MODULE
¥
PTA6/KBI6**
PTA5/KBI5**
PTA4/KBI4**
PTA3/KBI3**
PTA2/KBI2**
PTA1/KBI1**
PTA0/KBI0**
‡
‡
‡
‡
‡
‡
CONTROL AND STATUS REGISTERS — 64 BYTES
8-BIT ANALOG-TO-DIGITAL
CONVERTER MODULE
#
USER FLASH:
MC68H(R)C908JK3E/JL3E — 4,096 BYTES
MC68H(R)C908JK1E — 1,536 BYTES
USER RAM — 128 BYTES
MONITOR ROM — 960 BYTES
2-CHANNEL TIMER INTERFACE
MODULE
PTB7/ADC7
PTB6/ADC6
PTB5/ADC5
PTB4/ADC4
PTB3/ADC3
PTB2/ADC2
PTB1/ADC1
PTB0/ADC0
BREAK
MODULE
USER FLASH VECTOR SPACE — 48 BYTES
MC68HC908JL3E/JK3E/JK1E
OSC1
X-TAL OSCILLATOR
COMPUTER OPERATING
PROPERLY MODULE
¥
OSC2
†‡
PTD7**
MC68HRC908JL3E/JK3E/JK1E
RC OSCILLATOR
†‡
PTD6**
PTD5/TCH1
PTD4/TCH0
POWER-ON RESET
MODULE
‡
PTD3/ADC8
PTD2/ADC9
‡
SYSTEM INTEGRATION
MODULE
PTD1/ADC10
PTD0/ADC11
* RST
#
LOW-VOLTAGE INHIBIT
MODULE
EXTERNAL INTERRUPT
MODULE
* IRQ1
* Pin contains integrated pull-up device.
** Pin contains programmable pull-up device.
† 25mA open-drain if output pin.
VDD
POWER
‡ LED direct sink pin.
VSS
# Pins available on MC68H(R)C908JL3E only.
¥ Shared pin: MC68HC908JL3E/JK3E/JK1E — OSC2
ADC REFERENCE
MC68HRC908JL3E/JK3E/JK1E — RCCLK/PTA6/KBI6
Figure 1-1. MCU Block Diagram
Technical Data
26
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
General Description
General Description
Pin Assignments
1.5 Pin Assignments
28
27
26
25
24
23
22
21
20
19
18
17
16
15
IRQ1
PTA0/KBI0
VSS
1
RST
2
PTA5/KBI5
PTD4/TCH0
PTD5/TCH1
PTD2/ADC9
PTA4/KBI4
PTD3/ADC8
PTB0/ADC0
PTB1/ADC1
PTD1/ADC10
PTB2/ADC2
PTB3/ADC3
PTD0/ADC11
PTB4/ADC4
3
OSC1
4
OSC2/RCCLK/PTA6/KBI
PTA1/KBI1
VDD
5
6
7
PTA2/KBI2
PTA3/KBI3
PTB7/ADC7
PTB6/ADC6
PTB5/ADC5
PTD7
8
9
10
11
12
13
14
PTD6
MC68H(R)C908JL3E
Figure 1-2. 28-Pin PDIP/SOIC Pin Assignment
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
IRQ1
RST
VSS
OSC1
PTD4/TCH0
PTD5/TCH1
PTD2/ADC9
PTD3/ADC8
PTB0/ADC0
PTB1/ADC1
PTB2/ADC2
PTB3/ADC3
PTB4/ADC4
Pins not available on 20-pin packages
OSC2/RCCLK/PTA6/KBI
VDD
PTA0/KBI0
PTA1/KBI1
PTA2/KBI2
PTA3/KBI3
PTA4/KBI4
PTA5/KBI5
PTD0/ADC11
PTD1/ADC10
PTB7/ADC7
PTB6/ADC6
PTB5/ADC5
PTD7
PTD6
Internal pads are unconnected.
MC68H(R)C908JK3E/JK1E
Figure 1-3. 20-Pin PDIP/SOIC Pin Assignment
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
27
General Description
General Description
1
36
NC
NC
NC
2
3
35
34
33
32
31
30
29
28
27
26
NC
OSC1
NC
4
PTD2/ADC9
PTA4/KBI4
PTD3/ADC8
NC
OSC2/RCCLK/PTA6/KBI6
5
PTA1/KBI1
NC
6
MC68H(R)C908JL3E
7
VDD
8
PTB0/ADC0
PTB1/ADC1
PTD1/ADC10
NC
PTA2/KBI2
PTA3KBI3
PTB7/ADC7
NC
9
10
11
25
NC 12
NC
NC: No connection
Figure 1-4. 48-Pin LQFP Pin Assignment
Technical Data
28
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
General Description
General Description
Pin Functions
1.6 Pin Functions
Description of the pin functions are provided in Table 1-2.
Table 1-2. Pin Functions
PIN NAME
PIN DESCRIPTION
IN/OUT
In
VOLTAGE LEVEL
5V or 3V
VDD
VSS
Power supply.
Power supply ground
RESET input, active low.
Out
0V
RST
Input
VDD
With Internal pull-up and schmitt trigger input.
External IRQ pin.
With software programmable internal pull-up and
schmitt trigger input.
VDD to VDD+VHI
IRQ1
Input
This pin is also used for mode entry selection.
OSC1
X-tal or RC oscillator input.
In
Analog
Analog
MC68HC908JL3E/JK3E/JK1E:
X-tal oscillator output, this is the inverting OSC1
signal.
Out
OSC2
MC68HRC908JL3E/JK3E/JK1E:
Default is RC oscillator clock output, RCCLK.
Shared with PTA6/KBI6, with programmable pull-up.
In/Out
VDD
7-bit general purpose I/O port.
In/Out
In
VDD
VDD
Shared with 7 keyboard interrupts KBI[0:6].
Each pin has programmable internal pull-up device.
PTA[0:5] have LED direct sink capability
8-bit general purpose I/O port.
PTA[0:6]
PTB[0:7]
In
VDD
In
VSS
In/Out
In
VDD
Shared with 8 ADC inputs, ADC[0:7].
Analog
VDD
8-bit general purpose I/O port.
In/Out
Input
In/Out
In
PTD[3:0] shared with 4 ADC inputs, ADC[8:11].
PTD[4:5] shared with TIM channels, TCH0 and TCH1.
PTD[2:3], PTD[6:7] have LED direct sink capability
Analog
VDD
PTD[0:7]
VSS
PTD[6:7] can be configured as 25mA open-drain
output with pull-up.
In/Out
VDD
NOTE: On the MC68H(R)C908JK3E/JK1E, the following pins are not available:
PTA0, PTA1, PTA2, PTA3, PTA4, PTA5, PTD0, and PTD1.
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
29
General Description
General Description
Technical Data
30
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
General Description
Technical Data – MC68H(R)C908JL3E/JK3E/JK1E
Section 2. Memory Map
2.1 Contents
2.2
2.3
2.4
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
I/O Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Monitor ROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
2.2 Introduction
The CPU08 can address 64 Kbytes of memory space. The memory
map, shown in Figure 2-1, includes:
• 4,096 bytes of user FLASH — MC68H(R)C908JL3E/JK3E
1,536 bytes of user FLASH — MC68H(R)C908JK1E
• 128 bytes of RAM
• 48 bytes of user-defined vectors
• 960 bytes of Monitor ROM
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
31
Memory Map
Memory Map
$0000
↓
$003F
I/O REGISTERS
64 BYTES
$0040
↓
$007F
RESERVED
64 BYTES
$0080
↓
$00FF
RAM
128 BYTES
$0100
↓
$EBFF
UNIMPLEMENTED
60,160 BYTES
$0100
↓
$F5FF
UNIMPLEMENTED
62,720 BYTES
$EC00
↓
$FBFF
FLASH MEMORY
MC68H(R)C908JL3E/JK3E
4,096 BYTES
FLASH MEMORY
MC68H(R)C908JK1E
1,536 BYTES
$F600
↓
$FBFF
$FC00
↓
$FDFF
MONITOR ROM
512 BYTES
$FE00
$FE01
$FE02
$FE03
$FE04
$FE05
$FE06
$FE07
$FE08
BREAK STATUS REGISTER (BSR)
RESET STATUS REGISTER (RSR)
RESERVED (UBAR)
BREAK FLAG CONTROL REGISTER (BFCR)
INTERRUPT STATUS REGISTER 1 (INT1)
INTERRUPT STATUS REGISTER 2 (INT2)
INTERRUPT STATUS REGISTER 3 (INT3)
RESERVED
FLASH CONTROL REGISTER (FLCR)
$FE09
$FE0A
$FE0B
$FE0C
$FE0D
$FE0E
$FE0F
FLASH BLOCK PROTECT REGISTER (FLBPR)
RESERVED
RESERVED
BREAK ADDRESS HIGH REGISTER (BRKH)
BREAK ADDRESS LOW REGISTER (BRKL)
BREAK STATUS AND CONTROL REGISTER (BRKSCR)
RESERVED
$FE10
↓
$FFCF
MONITOR ROM
448 BYTES
$FFD0
↓
$FFFF
USER VECTORS
48 BYTES
Figure 2-1. Memory Map
Technical Data
32
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Memory Map
Memory Map
I/O Section
2.3 I/O Section
Addresses $0000–$003F, shown in Figure 2-2, contain most of the
control, status, and data registers. Additional I/O registers have the
following addresses:
• $FE00; Break Status Register, BSR
• $FE01; Reset Status Register, RSR
• $FE02; Reserved
• $FE03; Break Flag Control Register, BFCR
• $FE04; Interrupt Status Register 1, INT1
• $FE05; Interrupt Status Register 2, INT2
• $FE06; Interrupt Status Register 3, INT3
• $FE07; Reserved
• $FE08; FLASH Control Register, FLCR
• $FE09; FLASH Block Protect Register, FLBPR
• $FE0A; Reserved
• $FE0B; Reserved
• $FE0C; Break Address Register High, BRKH
• $FE0D; Break Address Register Low, BRKL
• $FE0E; Break Status and Control Register, BRKSCR
• $FE0F; Reserved
• $FFFF; COP Control Register, COPCTL
2.4 Monitor ROM
The 960 bytes at addresses $FC00–$FDFF and $FE10–$FFCF are
reserved ROM addresses that contain the instructions for the monitor
functions. (See Section 9. Monitor ROM (MON).)
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
33
Memory Map
Memory Map
Addr.
Register Name
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write:
Reset:
Read:
Write:
Reset:
Read:
0
PTA6
PTA5
PTA4
PTA3
PTA2
PTA1
PTA0
Port A Data Register
(PTA)
$0000
Unaffected by reset
PTB4 PTB3
Unaffected by reset
PTB7
PTB6
PTB5
PTB2
PTB1
PTB0
Port B Data Register
(PTB)
$0001
$0002
$0003
$0004
$0005
$0006
$0007
Unimplemented Write:
Read:
Port D Data Register
Write:
PTD7
0
PTD6
PTD5
PTD4
PTD3
PTD2
PTD1
PTD0
(PTD)
Reset:
Read:
Unaffected by reset
DDRA6
DDRA5
DDRA4
DDRA3
DDRA2
DDRA1
DDRA0
Data Direction Register A
(DDRA)
Write:
Reset:
Read:
0
DDRB7
0
0
DDRB6
0
0
DDRB5
0
0
DDRB4
0
0
DDRB3
0
0
DDRB2
0
0
DDRB1
0
0
DDRB0
0
Data Direction Register B
(DDRB)
Write:
Reset:
Read:
Unimplemented Write:
Read:
DDRD7
0
DDRD6
0
DDRD5
0
DDRD4
0
DDRD3 DDRD2 DDRD1 DDRD0
Data Direction Register D
(DDRD)
Write:
Reset:
Read:
0
0
0
0
$0008
↓
Unimplemented Write:
$0009
Read:
Port D Control Register
Write:
0
0
0
0
0
0
0
0
SLOWD7 SLOWD6 PTDPU7 PTDPU6
$000A
(PDCR)
Reset:
0
0
0
0
= Unimplemented
R
= Reserved
Figure 2-2. Control, Status, and Data Registers (Sheet 1 of 5)
Technical Data
34
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Memory Map
Memory Map
Monitor ROM
Addr.
Register Name
Bit 7
6
5
4
3
2
1
Bit 0
Read:
$000B
↓
Unimplemented Write:
$000C
Read:
Port A Input Pull-up
Enable Register Write:
PTA6EN PTAPUE6 PTAPUE5 PTAPUE4 PTAPUE3 PTAPUE2 PTAPUE1 PTAPUE0
$000D
(PTAPUE)
Reset:
0
0
0
0
0
0
0
0
$000E
↓
Read:
Write:
Read:
Unimplemented
$0019
0
0
0
0
KEYF
0
ACKK
0
Keyboard Status and
MODEK
IMASKK
$001A
Control Register Write:
(KBSCR)
Reset:
0
0
0
KBIE6
0
0
KBIE5
0
0
KBIE4
0
0
KBIE3
0
0
KBIE1
0
0
KBIE0
0
Read:
Keyboard Interrupt
Enable Register Write:
KBIE2
0
$001B
$001C
(KBIER)
Reset:
0
Read:
Unimplemented Write:
Read:
0
0
0
0
IRQF1
0
ACK1
0
IRQ Status and Control
IMASK1 MODE1
$001D
$001E
$001F
Register Write:
(INTSCR)
Reset:
0
0
R
0
0
R
0
0
LVIT1
0*
0
LVIT0
0*
0
0
Read:
Configuration Register 2
Write:
IRQPUD
R
R
R
(CONFIG2)†
Reset:
0
COPRS
0
0
SSREC
0
0
STOP
0
0
COPD
0
Read:
Configuration Register 1
Write:
R
R
LVID
R
(CONFIG1)†
Reset:
0
0
0
0
† One-time writable register after each reset. * LVIT1 and LVIT0 reset to logic 0 by a power-on reset (POR) only.
Read:
TOF
0
0
TRST
0
0
TIM Status and Control
TOIE
0
TSTOP
1
PS2
PS1
0
PS0
0
$0020
Register Write:
(TSC)
Reset:
0
0
0
= Unimplemented
R
= Reserved
Figure 2-2. Control, Status, and Data Registers (Sheet 2 of 5)
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
35
Memory Map
Memory Map
Addr.
Register Name
TIM Counter Register
Bit 7
6
5
4
3
2
1
Bit 0
Read: Bit15
Bit14
Bit13
Bit12
Bit11
Bit10
Bit9
Bit8
$0021
High Write:
(TCNTH)
Reset:
Read:
0
0
0
0
0
0
0
0
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
TIM Counter Register
$0022
$0023
$0024
$0025
$0026
$0027
$0028
$0029
$002A
Low Write:
(TCNTL)
Reset:
Read:
0
Bit15
1
0
Bit14
1
0
Bit13
1
0
Bit12
1
0
Bit11
1
0
Bit10
1
0
Bit9
1
0
TIM Counter Modulo
Bit8
Register High Write:
(TMODH)
Reset:
1
Read:
TIM Counter Modulo
Bit7
Bit6
1
Bit5
1
Bit4
1
Bit3
1
Bit2
1
Bit1
1
Bit0
Register Low Write:
(TMODL)
Reset:
1
1
CH0MAX
0
Read: CH0F
TIM Channel 0 Status and
(TSC0)
CH0IE
0
MS0B
0
MS0A
0
ELS0B
0
ELS0A
0
TOV0
0
Control Register Write:
0
0
Reset:
Read:
TIM Channel 0
Bit15
Bit14
Bit13
Bit12
Bit11
Bit10
Bit9
Bit8
Register High Write:
(TCH0H)
Reset:
Indeterminate after reset
Bit4 Bit3
Indeterminate after reset
Read:
TIM Channel 0
Register Low Write:
Bit7
Bit6
Bit5
0
Bit2
Bit1
Bit0
(TCH0L)
Reset:
Read: CH1F
TIM Channel 1 Status and
(TSC1)
CH1IE
0
MS1A
0
ELS1B
0
ELS1A
0
TOV1
0
CH1MAX
Control Register Write:
0
0
Reset:
Read:
0
0
TIM Channel 1
Bit15
Bit14
Bit13
Bit12
Bit11
Bit10
Bit9
Bit8
Register High Write:
(TCH1H)
Reset:
Indeterminate after reset
Bit4 Bit3
Read:
TIM Channel 1
Register Low Write:
Bit7
Bit6
Bit5
Bit2
Bit1
Bit0
(TCH1L)
Reset:
Indeterminate after reset
R
= Unimplemented
= Reserved
Figure 2-2. Control, Status, and Data Registers (Sheet 3 of 5)
Technical Data
36
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Memory Map
Memory Map
Monitor ROM
Addr.
Register Name
Bit 7
6
5
4
3
2
1
Bit 0
$002B
↓
Read:
Write:
Unimplemented
$003B
Read: COCO
ADC Status and Control
Register Write:
AIEN
ADCO
ADCH4
ADCH3
ADCH2
ADCH1
ADCH0
$003C
$003D
(ADSCR)
Reset:
Read:
Write:
Reset:
Read:
Write:
Reset:
Read:
0
0
0
1
1
1
1
1
AD7
AD6
AD5
AD4
AD3
AD2
AD1
AD0
ADC Data Register
(ADR)
Indeterminate after reset
0
0
0
0
0
0
0
0
ADIV2
0
ADIV1
0
ADIV0
0
ADC Input Clock Register
(ADICLK)
$003E
$003F
0
0
Unimplemented Write:
Read:
SBSW
See note
0
R
R
R
R
R
R
R
0
Break Status Register
(BSR)
$FE00
Write:
Reset:
Note: Writing a logic 0 clears SBSW.
Read: POR
Write:
PIN
COP
ILOP
ILAD
MODRST
LVI
Reset Status Register
$FE01
(RSR)
POR:
Read:
1
0
0
0
0
0
0
0
R
R
R
R
R
R
R
R
$FE02
$FE03
$FE04
Reserved Write:
Read:
Break Flag Control
BCFE
R
R
R
R
R
R
R
Register Write:
(BFCR)
Reset:
0
0
Read:
IF5
R
IF4
R
IF3
R
0
R
0
IF1
0
R
0
0
R
0
Interrupt Status Register 1
(INT1)
Write:
R
0
R
Reset:
0
0
0
0
= Unimplemented
R
= Reserved
Figure 2-2. Control, Status, and Data Registers (Sheet 4 of 5)
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
37
Memory Map
Memory Map
Addr.
Register Name
Bit 7
IF14
R
6
0
5
0
4
0
3
0
2
0
1
0
Bit 0
0
Read:
Write:
Reset:
Read:
Write:
Reset:
Read:
Interrupt Status Register 2
(INT2)
$FE05
R
0
R
0
R
0
R
0
R
0
R
0
R
0
0
0
0
0
0
0
0
0
IF15
R
Interrupt Status Register 3
(INT3)
$FE06
$FE07
$FE08
$FE09
R
R
0
R
0
R
0
R
0
R
0
R
0
0
0
R
R
R
R
R
R
R
R
Reserved Write:
Read:
0
0
0
0
HVEN
MASS
ERASE
PGM
FLASH Control Register
(FLCR)
Write:
Reset:
Read:
Write:
Reset:
Read:
0
BPR7
0
0
BPR6
0
0
BPR5
0
0
BPR4
0
0
BPR3
0
0
BPR2
0
0
BPR1
0
0
BPR0
0
FLASH Block Protect
Register (FLBPR)
$FE0A
↓
$FE0B
R
R
R
R
R
R
R
R
Reserved Write:
Read:
Break Address High
Bit15
0
Bit14
0
Bit13
0
Bit12
0
Bit11
0
Bit10
0
Bit9
0
Bit8
0
$FE0C
$FE0D
$FE0E
Register Write:
(BRKH)
Reset:
Read:
Break Address low
Bit7
0
Bit6
0
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Register Write:
(BRKL)
Reset:
0
0
0
0
0
0
0
0
0
0
0
0
Read:
Break Status and Control
BRKE
0
BRKA
0
Register Write:
(BRKSCR)
Reset:
0
0
0
0
0
0
Read:
Low byte of reset vector
COP Control Register
(COPCTL)
$FFFF
Write:
Writing clears COP counter (any value)
Unaffected by reset
Reset:
= Unimplemented
R
= Reserved
Figure 2-2. Control, Status, and Data Registers (Sheet 5 of 5)
Technical Data
38
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Memory Map
Memory Map
Monitor ROM
.
Table 2-1. Vector Addresses
Vector Priority INT Flag Address
Vector
$FFD0
↓
$FFDD
Lowest
—
Not Used
$FFDE
$FFDF
$FFE0
$FFE1
ADC Conversion Complete Vector (High)
ADC Conversion Complete Vector (Low)
Keyboard Vector (High)
IF15
IF14
Keyboard Vector (Low)
IF13
↓
IF6
—
Not Used
$FFF2
$FFF3
$FFF4
$FFF5
$FFF6
$FFF7
—
TIM Overflow Vector (High)
TIM Overflow Vector (Low)
TIM Channel 1 Vector (High)
TIM Channel 1 Vector (Low)
TIM Channel 0 Vector (High)
TIM Channel 0 Vector (Low)
Not Used
IF5
IF4
IF3
IF2
IF1
$FFFA
$FFFB
$FFFC
$FFFD
$FFFE
$FFFF
IRQ1 Vector (High)
IRQ1 Vector (Low)
SWI Vector (High)
—
—
SWI Vector (Low)
Reset Vector (High)
Highest
Reset Vector (Low)
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
39
Memory Map
Memory Map
Technical Data
40
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Memory Map
Technical Data – MC68H(R)C908JL3E/JK3E/JK1E
Section 3. Random-Access Memory (RAM)
3.1 Contents
3.2
3.3
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
3.2 Introduction
This section describes the 128 bytes of RAM.
3.3 Functional Description
Addresses $0080 through $00FF are RAM locations. The location of the
stack RAM is programmable. The 16-bit stack pointer allows the stack to
be anywhere in the 64-Kbyte memory space.
NOTE: For correct operation, the stack pointer must point only to RAM
locations.
Within page zero are 128 bytes of RAM. Because the location of the
stack RAM is programmable, all page zero RAM locations can be used
for I/O control and user data or code. When the stack pointer is moved
from its reset location at $00FF, direct addressing mode instructions can
access efficiently all page zero RAM locations. Page zero RAM,
therefore, provides ideal locations for frequently accessed global
variables.
Before processing an interrupt, the CPU uses five bytes of the stack to
save the contents of the CPU registers.
NOTE: For M6805 compatibility, the H register is not stacked.
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA Random-Access Memory (RAM)
Technical Data
41
Random-Access Memory (RAM)
During a subroutine call, the CPU uses two bytes of the stack to store
the return address. The stack pointer decrements during pushes and
increments during pulls.
NOTE: Be careful when using nested subroutines. The CPU may overwrite data
in the RAM during a subroutine or during the interrupt stacking
operation.
Technical Data
42
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
Random-Access Memory (RAM)
MOTOROLA
Technical Data – MC68H(R)C908JL3E/JK3E/JK1E
Section 4. FLASH Memory (FLASH)
4.1 Contents
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
FLASH Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
FLASH Page Erase Operation . . . . . . . . . . . . . . . . . . . . . . . . .46
FLASH Mass Erase Operation . . . . . . . . . . . . . . . . . . . . . . . . .47
FLASH Program Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . .48
FLASH Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
FLASH Block Protect Register . . . . . . . . . . . . . . . . . . . . . . . . .50
4.2 Introduction
This section describes the operation of the embedded FLASH memory.
The FLASH memory can be read, programmed, and erased from a
single external supply. The program and erase operations are enabled
through the use of an internal charge pump.
FLASH Memory Size
Device
Memory Address Range
(Bytes)
4,096
4,096
1,536
MC68H(R)C908JL3E
MC68H(R)C908JK3E
MC68H(R)C908JK1E
$EC00—$FBFF
$EC00—$FBFF
$F600—$FBFF
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
43
FLASH Memory (FLASH)
FLASH Memory (FLASH)
Addr.
Register Name
Bit 7
6
5
4
3
HVEN
0
2
MASS
0
1
ERASE
0
Bit 0
PGM
0
Read:
Write:
Reset:
Read:
0
0
0
0
FLASH Control Register
(FLCR)
$FE08
0
BPR7
0
0
BPR6
0
0
BPR5
0
0
BPR4
0
FLASH Block Protect
BPR3
0
BPR2
0
BPR1
0
BPR0
0
$FE09
Register Write:
(FLBPR)
Reset:
= Unimplemented
Figure 4-1. FLASH I/O Register Summary
4.3 Functional Description
The FLASH memory consists of an array of 4,096 or 1,536 bytes with an
additional 48 bytes for user vectors. The minimum size of FLASH
memory that can be erased is 64 bytes (a page); and the maximum size
of FLASH memory that can be programmed in a program cycle is 32
bytes (a row). Program and erase operations are facilitated through
control bits in the Flash Control Register (FLCR). Details for these
operations appear later in this section. The address ranges for the user
memory and vectors are:
• $EC00–$FBFF; user memory; 4,096 bytes;
MC68H(R)C908JL3E/JK3E
$F600–$FBFF; user memory; 1,536 bytes;
MC68H(R)C908JK1E
• $FFD0–$FFFF; user interrupt vectors; 48 bytes
NOTE: An erased bit reads as logic 1 and a programmed bit reads as logic 0.
A security feature prevents viewing of the FLASH contents.1
1. No security feature is absolutely secure. However, Motorola’s strategy is to make reading or
copying the FLASH difficult for unauthorized users.
Technical Data
44
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
FLASH Memory (FLASH)
MOTOROLA
FLASH Memory (FLASH)
FLASH Control Register
4.4 FLASH Control Register
The FLASH Control Register controls FLASH program and erase
operations.
Address: $FE08
Bit 7
6
0
5
0
4
0
3
HVEN
0
2
MASS
0
1
ERASE
0
Bit 0
PGM
0
Read:
Write:
Reset:
0
0
0
0
0
Figure 4-2. FLASH Control Register (FLCR)
HVEN — High Voltage Enable Bit
This read/write bit enables high voltage from the charge pump to the
memory for either program or erase operation. It can only be set if
either PGM=1 or ERASE=1 and the proper sequence for program or
erase is followed.
1 = High voltage enabled to array and charge pump on
0 = High voltage disabled to array and charge pump off
MASS — Mass Erase Control Bit
This read/write bit configures the memory for mass erase operation or
page erase operation when the ERASE bit is set.
1 = Mass erase operation selected
0 = Page erase operation selected
ERASE — Erase Control Bit
This read/write bit configures the memory for erase operation. This bit
and the PGM bit should not be set to 1 at the same time.
1 = Erase operation selected
0 = Erase operation not selected
PGM — Program Control Bit
This read/write bit configures the memory for program operation. This
bit and the ERASE bit should not be set to 1 at the same time.
1 = Program operation selected
0 = Program operation not selected
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA FLASH Memory (FLASH)
Technical Data
45
FLASH Memory (FLASH)
4.5 FLASH Page Erase Operation
Use the following procedure to erase a page of FLASH memory. A page
consists of 64 consecutive bytes starting from addresses $XX00,
$XX40, $XX80 or $XXC0. The 48-byte user interrupt vectors area also
forms a page. Any page within the 4K bytes user memory area
($EC00–$FBFF) can be erased alone. The 48-byte user interrupt
vectors cannot be erased by the page erase operation because of
security reasons. Mass erase is required to erase this page.
1. Set the ERASE bit and clear the MASS bit in the FLASH Control
Register.
2. Write any data to any FLASH address within the page address
range desired.
3. Wait for a time, tnvs (10µs).
4. Set the HVEN bit.
5. Wait for a time tErase (1ms).
6. Clear the ERASE bit.
7. Wait for a time, tnvh (5µs).
8. Clear the HVEN bit.
9. After time, trcv (1µs), the memory can be accessed in read mode
again.
NOTE: Programming and erasing of FLASH locations cannot be performed by
code being executed from the FLASH memory. While these operations
must be performed in the order as shown, but other unrelated operations
may occur between the steps.
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46
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
FLASH Memory (FLASH)
MOTOROLA
FLASH Memory (FLASH)
FLASH Mass Erase Operation
4.6 FLASH Mass Erase Operation
Use the following procedure to erase the entire FLASH memory:
1. Set both the ERASE bit and the MASS bit in the FLASH Control
Register.
2. Write any data to any FLASH location within the FLASH memory
address range.
3. Wait for a time, tnvs (10µs).
4. Set the HVEN bit.
5. Wait for a time tMErase (4ms).
6. Clear the ERASE bit.
7. Wait for a time, tnvh1 (100µs).
8. Clear the HVEN bit.
9. After time, trcv (1µs), the memory can be accessed in read mode
again.
NOTE: Programming and erasing of FLASH locations cannot be performed by
code being executed from the FLASH memory. While these operations
must be performed in the order as shown, but other unrelated operations
may occur between the steps.
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MOTOROLA FLASH Memory (FLASH)
Technical Data
47
FLASH Memory (FLASH)
4.7 FLASH Program Operation
Programming of the FLASH memory is done on a row basis. A row
consists of 32 consecutive bytes starting from addresses $XX00,
$XX20, $XX40, $XX60, $XX80, $XXA0, $XXC0 or $XXE0. Use this
step-by-step procedure to program a row of FLASH memory:
(Figure 4-3 shows a flowchart of the programming algorithm.)
1. Set the PGM bit. This configures the memory for program
operation and enables the latching of address and data for
programming.
2. Write any data to any FLASH location within the address range of
the row to be programmed.
3. Wait for a time, tnvs (10µs).
4. Set the HVEN bit.
5. Wait for a time, tpgs (5µs).
6. Write data to the byte being programmed.
7. Wait for time, tPROG (30µs).
8. Repeat step 6 and 7 until all the bytes within the row are
programmed.
9. Clear the PGM bit.
10. Wait for time, tnvh (5µs).
11. Clear the HVEN bit.
12. After time, trcv (1µs), the memory can be accessed in read mode
again.
This program sequence is repeated throughout the memory until all data
is programmed.
NOTE: The time between each FLASH address change (step 6 to step 6), or the
time between the last FLASH addressed programmed to clearing the
PGM bit (step 6 to step 10), must not exceed the maximum programming
time, tPROG max.
NOTE: Programming and erasing of FLASH locations cannot be performed by
code being executed from the FLASH memory. While these operations
must be performed in the order shown, other unrelated operations may
occur between the steps.
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FLASH Memory (FLASH)
MOTOROLA
FLASH Memory (FLASH)
FLASH Program Operation
1
2
Set PGM bit
Algorithm for programming
a row (32 bytes) of FLASH memory
Write any data to any FLASH address
within the row address range desired
3
4
5
Wait for a time, tnvs
Set HVEN bit
Wait for a time, tpgs
6
7
Write data to the FLASH address
to be programmed
Wait for a time, tPROG
Completed
Y
programming
this row?
N
9
Clear PGM bit
Wait for a time, tnvh
Clear HVEN bit
NOTE:
The time between each FLASH address change (step 6 to step 6), or
the time between the last FLASH address programmed
to clearing PGM bit (step 6 to step 9)
10
11
12
must not exceed the maximum programming
time, tPROG max.
This row program algorithm assumes the row/s
to be programmed are initially erased.
Wait for a time, trcv
End of Programming
Figure 4-3. FLASH Programming Flowchart
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49
FLASH Memory (FLASH)
4.8 FLASH Protection
Due to the ability of the on-board charge pump to erase and program the
FLASH memory in the target application, provision is made to protect
blocks of memory from unintentional erase or program operations due to
system malfunction. This protection is done by use of a FLASH Block
Protect Register (FLBPR). The FLBPR determines the range of the
FLASH memory which is to be protected. The range of the protected
area starts from a location defined by FLBPR and ends to the bottom of
the FLASH memory ($FFFF). When the memory is protected, the HVEN
bit cannot be set in either ERASE or PROGRAM operations.
4.9 FLASH Block Protect Register
The FLASH Block Protect Register is implemented as an 8-bit I/O
register. The value in this register determines the starting address of the
protected range within the FLASH memory.
Address: $FE09
Bit 7
BPR7
0
6
BPR6
0
5
BPR5
0
4
BPR4
0
3
BPR3
0
2
BPR2
0
1
BPR1
0
Bit 0
BPR0
0
Read:
Write:
Reset:
Figure 4-4. FLASH Block Protect Register (FLBPR)
BPR[7:0] — FLASH Block Protect Register Bit 7 to Bit 0
BPR[7:1] represent bits [12:6] of a 16-bit memory address. Bits
[15:13] are logic 1’s and bits [5:0] are logic 0’s.
16-bit memory address
Start address of FLASH block protect 1 1 1
0 0 0 0 0 0
BPR[7:1]
BPR0 is used only for BPR[7:0] = $FF, for no block protection.
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FLASH Memory (FLASH)
MOTOROLA
FLASH Memory (FLASH)
FLASH Block Protect Register
The resultant 16-bit address is used for specifying the start address
of the FLASH memory for block protection. The FLASH is protected
from this start address to the end of FLASH memory, at $FFFF. With
this mechanism, the protect start address can be XX00, XX40, XX80,
or XXC0 (at page boundaries — 64 bytes) within the FLASH memory.
Examples of protect start address:
BPR[7:0]
Start of Address of Protect Range
$00–$60
The entire FLASH memory is protected.
$62 or $63
(0110 001x)
$EC40 (1110 1100 0100 0000)
$EC80 (1110 1100 1000 0000)
$ED00 (1110 1101 0000 0000)
$64 or $65
(0110 010x)
$68 or $69
(0110 100x)
and so on...
$DE or $DF
(1101 111x)
$FBC0 (1111 1011 1100 0000)
$FE
(1111 1110)
$FFC0 (1111 1111 1100 0000)
$FF
The entire FLASH memory is not protected.
Note:
The end address of the protected range is always $FFFF.
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51
FLASH Memory (FLASH)
Technical Data
52
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
FLASH Memory (FLASH)
Technical Data – MC68H(R)C908JL3E/JK3E/JK1E
Section 5. Configuration Register (CONFIG)
5.1 Contents
5.2
5.3
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
5.2 Introduction
This section describes the configuration registers (CONFIG1 and
CONFIG2). The configuration registers enables or disables the following
options:
• Stop mode recovery time (32 × 2OSCOUT cycles or
4096 × 2OSCOUT cycles)
• STOP instruction
• Computer operating properly module (COP)
• COP reset period (COPRS), (213–24) × 2OSCOUT or
(218–24) × 2OSCOUT
• Enable LVI circuit
• Select LVI trip voltage
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53
Configuration Register (CONFIG)
5.3 Functional Description
The configuration register is used in the initialization of various options.
The configuration register can be written once after each reset. All of the
configuration register bits are cleared during reset. Since the various
options affect the operation of the MCU it is recommended that this
register be written immediately after reset. The configuration register is
located at $001E and $001F, and may be read at anytime.
NOTE: The CONFIG registers are one-time writable by the user after each
reset. Upon a reset, the CONFIG registers default to predetermined
settings as shown in Figure 5-1 and Figure 5-2.
Address:
$001E
Bit 7
6
5
4
3
2
1
Bit 0
R
Read:
Write:
Reset:
POR:
IRQPUD
R
R
LVIT1
LVIT0
R
R
Not affected Not affected
0
0
0
0
0
0
0
0
0
0
0
0
0
0
R
= Reserved
Figure 5-1. Configuration Register 2 (CONFIG2)
IRQPUD — IRQ1 Pin Pull-up control bit
1 = Internal pull-up is disconnected
0 = Internal pull-up is connected between IRQ1 pin and VDD
LVIT1, LVIT0 — Low Voltage Inhibit trip voltage selection bits
Detail description of the LVI control signals is given in Section 16.
Low Voltage Inhibit (LVI)
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Configuration Register (CONFIG)
MOTOROLA
Configuration Register (CONFIG)
Functional Description
Address:
$001F
Bit 7
6
5
R
0
4
LVID
0
3
R
0
2
SSREC
0
1
STOP
0
Bit 0
COPD
0
Read:
Write:
Reset:
COPRS
R
0
0
R
= Reserved
Figure 5-2. Configuration Register 1 (CONFIG1)
COPRS — COP reset period selection bit
1 = COP reset cycle is (213 – 24) × 2OSCOUT
0 = COP reset cycle is (218 – 24) × 2OSCOUT
LVID — Low Voltage Inhibit Disable Bit
1 = Low Voltage Inhibit disabled
0 = Low Voltage Inhibit enabled
SSREC — Short Stop Recovery Bit
SSREC enables the CPU to exit stop mode with a delay of
32 × 2OSCOUT cycles instead of a 4096 × 2OSCOUT cycle delay.
1 = Stop mode recovery after 32 × 2OSCOUT cycles
0 = Stop mode recovery after 4096 × 2OSCOUT cycles
NOTE: Exiting stop mode by pulling reset will result in the long stop recovery.
If using an external crystal, do not set the SSREC bit.
STOP — STOP Instruction Enable
STOP enables the STOP instruction.
1 = STOP instruction enabled
0 = STOP instruction treated as illegal opcode
COPD — COP Disable Bit
COPD disables the COP module. (See Section 15. Computer
Operating Properly (COP).)
1 = COP module disabled
0 = COP module enabled
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Technical Data
55
Configuration Register (CONFIG)
Technical Data
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
Configuration Register (CONFIG) MOTOROLA
56
Technical Data – MC68H(R)C908JL3E/JK3E/JK1E
Section 6. Central Processor Unit (CPU)
6.1 Contents
6.2
6.3
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
6.4
CPU Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
Accumulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
Index Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
Stack Pointer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
Program Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
Condition Code Register . . . . . . . . . . . . . . . . . . . . . . . . . . .62
6.4.1
6.4.2
6.4.3
6.4.4
6.4.5
6.5
Arithmetic/Logic Unit (ALU) . . . . . . . . . . . . . . . . . . . . . . . . . . .64
6.6
6.6.1
6.6.2
Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
6.7
6.8
6.9
CPU During Break Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . .65
Instruction Set Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
Opcode Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
6.2 Introduction
The M68HC08 CPU (central processor unit) is an enhanced and fully
object-code-compatible version of the M68HC05 CPU. The CPU08
Reference Manual (Motorola document order number CPU08RM/AD)
contains a description of the CPU instruction set, addressing modes,
and architecture.
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Central Processor Unit (CPU)
6.3 Features
• Object code fully upward-compatible with M68HC05 Family
• 16-bit stack pointer with stack manipulation instructions
• 16-bit index register with x-register manipulation instructions
• 8-MHz CPU internal bus frequency
• 64-Kbyte program/data memory space
• 16 addressing modes
• Memory-to-memory data moves without using accumulator
• Fast 8-bit by 8-bit multiply and 16-bit by 8-bit divide instructions
• Enhanced binary-coded decimal (BCD) data handling
• Modular architecture with expandable internal bus definition for
extension of addressing range beyond 64 Kbytes
• Low-power stop and wait modes
6.4 CPU Registers
Figure 6-1 shows the five CPU registers. CPU registers are not part of
the memory map.
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Central Processor Unit (CPU)
MOTOROLA
Central Processor Unit (CPU)
CPU Registers
7
0
0
0
0
ACCUMULATOR (A)
15
15
15
H
X
INDEX REGISTER (H:X)
STACK POINTER (SP)
PROGRAM COUNTER (PC)
CONDITION CODE REGISTER (CCR)
7
0
V
1
1
H
I
N
Z
C
CARRY/BORROW FLAG
ZERO FLAG
NEGATIVE FLAG
INTERRUPT MASK
HALF-CARRY FLAG
TWO’S COMPLEMENT OVERFLOW FLAG
Figure 6-1. CPU Registers
6.4.1 Accumulator
The accumulator is a general-purpose 8-bit register. The CPU uses the
accumulator to hold operands and the results of arithmetic/logic
operations.
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write:
Reset:
Unaffected by reset
Figure 6-2. Accumulator (A)
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MOTOROLA Central Processor Unit (CPU)
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Central Processor Unit (CPU)
6.4.2 Index Register
The 16-bit index register allows indexed addressing of a 64-Kbyte
memory space. H is the upper byte of the index register, and X is the
lower byte. H:X is the concatenated 16-bit index register.
In the indexed addressing modes, the CPU uses the contents of the
index register to determine the conditional address of the operand.
The index register can serve also as a temporary data storage location.
Bit
15
Bit
0
14 13 12 11 10
9
8
7
6
5
4
3
2
1
Read:
Write:
Reset:
0
0
0
0
0
0
0
0
X
X
X
X
X
X
X
X
X = Indeterminate
Figure 6-3. Index Register (H:X)
6.4.3 Stack Pointer
The stack pointer is a 16-bit register that contains the address of the next
location on the stack. During a reset, the stack pointer is preset to
$00FF. The reset stack pointer (RSP) instruction sets the least
significant byte to $FF and does not affect the most significant byte. The
stack pointer decrements as data is pushed onto the stack and
increments as data is pulled from the stack.
In the stack pointer 8-bit offset and 16-bit offset addressing modes, the
stack pointer can function as an index register to access data on the
stack. The CPU uses the contents of the stack pointer to determine the
conditional address of the operand.
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Central Processor Unit (CPU)
MOTOROLA
Central Processor Unit (CPU)
CPU Registers
Bit
15
Bit
0
14 13 12 11 10
9
8
7
6
5
4
3
2
1
Read:
Write:
Reset:
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Figure 6-4. Stack Pointer (SP)
NOTE: The location of the stack is arbitrary and may be relocated anywhere in
RAM. Moving the SP out of page 0 ($0000 to $00FF) frees direct
address (page 0) space. For correct operation, the stack pointer must
point only to RAM locations.
6.4.4 Program Counter
The program counter is a 16-bit register that contains the address of the
next instruction or operand to be fetched.
Normally, the program counter automatically increments to the next
sequential memory location every time an instruction or operand is
fetched. Jump, branch, and interrupt operations load the program
counter with an address other than that of the next sequential location.
During reset, the program counter is loaded with the reset vector
address located at $FFFE and $FFFF. The vector address is the
address of the first instruction to be executed after exiting the reset state.
Bit
15
Bit
0
14 13 12 11 10
9
8
7
6
5
4
3
2
1
Read:
Write:
Reset:
Loaded with Vector from $FFFE and $FFFF
Figure 6-5. Program Counter (PC)
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61
Central Processor Unit (CPU)
6.4.5 Condition Code Register
The 8-bit condition code register contains the interrupt mask and five
flags that indicate the results of the instruction just executed. Bits 6 and
5 are set permanently to logic 1. The following paragraphs describe the
functions of the condition code register.
Bit 7
6
1
1
5
1
1
4
H
X
3
I
2
N
X
1
Z
X
Bit 0
Read:
Write:
Reset:
V
C
X
X
1
X = Indeterminate
Figure 6-6. Condition Code Register (CCR)
V — Overflow Flag
The CPU sets the overflow flag when a two's complement overflow
occurs. The signed branch instructions BGT, BGE, BLE, and BLT use
the overflow flag.
1 = Overflow
0 = No overflow
H — Half-Carry Flag
The CPU sets the half-carry flag when a carry occurs between
accumulator bits 3 and 4 during an add-without-carry (ADD) or add-
with-carry (ADC) operation. The half-carry flag is required for binary-
coded decimal (BCD) arithmetic operations. The DAA instruction
uses the states of the H and C flags to determine the appropriate
correction factor.
1 = Carry between bits 3 and 4
0 = No carry between bits 3 and 4
I — Interrupt Mask
When the interrupt mask is set, all maskable CPU interrupts are
disabled. CPU interrupts are enabled when the interrupt mask is
cleared. When a CPU interrupt occurs, the interrupt mask is set
automatically after the CPU registers are saved on the stack, but
before the interrupt vector is fetched.
1 = Interrupts disabled
0 = Interrupts enabled
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Central Processor Unit (CPU)
MOTOROLA
Central Processor Unit (CPU)
CPU Registers
NOTE: To maintain M6805 Family compatibility, the upper byte of the index
register (H) is not stacked automatically. If the interrupt service routine
modifies H, then the user must stack and unstack H using the PSHH and
PULH instructions.
After the I bit is cleared, the highest-priority interrupt request is
serviced first.
A return-from-interrupt (RTI) instruction pulls the CPU registers from
the stack and restores the interrupt mask from the stack. After any
reset, the interrupt mask is set and can be cleared only by the clear
interrupt mask software instruction (CLI).
N — Negative flag
The CPU sets the negative flag when an arithmetic operation, logic
operation, or data manipulation produces a negative result, setting
bit 7 of the result.
1 = Negative result
0 = Non-negative result
Z — Zero flag
The CPU sets the zero flag when an arithmetic operation, logic
operation, or data manipulation produces a result of $00.
1 = Zero result
0 = Non-zero result
C — Carry/Borrow Flag
The CPU sets the carry/borrow flag when an addition operation
produces a carry out of bit 7 of the accumulator or when a subtraction
operation requires a borrow. Some instructions — such as bit test and
branch, shift, and rotate — also clear or set the carry/borrow flag.
1 = Carry out of bit 7
0 = No carry out of bit 7
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Central Processor Unit (CPU)
6.5 Arithmetic/Logic Unit (ALU)
The ALU performs the arithmetic and logic operations defined by the
instruction set.
Refer to the CPU08 Reference Manual (Motorola document order
number CPU08RM/AD) for a description of the instructions and
addressing modes and more detail about the architecture of the CPU.
6.6 Low-Power Modes
The WAIT and STOP instructions put the MCU in low power-
consumption standby modes.
6.6.1 Wait Mode
The WAIT instruction:
• Clears the interrupt mask (I bit) in the condition code register,
enabling interrupts. After exit from wait mode by interrupt, the I bit
remains clear. After exit by reset, the I bit is set.
• Disables the CPU clock
6.6.2 Stop Mode
The STOP instruction:
• Clears the interrupt mask (I bit) in the condition code register,
enabling external interrupts. After exit from stop mode by external
interrupt, the I bit remains clear. After exit by reset, the I bit is set.
• Disables the CPU clock
After exiting stop mode, the CPU clock begins running after the oscillator
stabilization delay.
Technical Data
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MOTOROLA
Central Processor Unit (CPU)
CPU During Break Interrupts
6.7 CPU During Break Interrupts
If a break module is present on the MCU, the CPU starts a break
interrupt by:
• Loading the instruction register with the SWI instruction
• Loading the program counter with $FFFC:$FFFD or with
$FEFC:$FEFD in monitor mode
The break interrupt begins after completion of the CPU instruction in
progress. If the break address register match occurs on the last cycle of
a CPU instruction, the break interrupt begins immediately.
A return-from-interrupt instruction (RTI) in the break routine ends the
break interrupt and returns the MCU to normal operation if the break
interrupt has been deasserted.
6.8 Instruction Set Summary
Table 6-1 provides a summary of the M68HC08 instruction set.
6.9 Opcode Map
The opcode map is provided in Table 6-2.
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MOTOROLA Central Processor Unit (CPU)
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65
Central Processor Unit (CPU)
Table 6-1. Instruction Set Summary
Effect on
CCR
Source
Operation
Form
Description
V H
I
N Z
C
ADC #opr
ADC opr
ADC opr
ADC opr,X
ADC opr,X
ADC ,X
ADC opr,SP
ADC opr,SP
IMM
DIR
EXT
IX2
IX1
IX
A9
B9
C9
D9
E9
F9
ii
2
3
4
4
3
2
4
5
dd
hh ll
ee ff
ff
Add with Carry
A ← (A) + (M) + (C)
↕
↕
–
↕
↕
↕
SP1
SP2
9EE9 ff
9ED9 ee ff
ADD #opr
ADD opr
ADD opr
IMM
DIR
EXT
IX2
IX1
IX
AB
BB
CB
DB
EB
FB
ii
2
3
4
4
3
2
4
5
dd
hh ll
ee ff
ff
ADD opr,X
Add without Carry
ADD opr,X
A ← (A) + (M)
↕
↕
–
↕
↕
↕
ADD ,X
ADD opr,SP
ADD opr,SP
SP1
SP2
9EEB ff
9EDB ee ff
AIS #opr
AIX #opr
Add Immediate Value (Signed) to SP
Add Immediate Value (Signed) to H:X
SP ← (SP) + (16 « M)
H:X ← (H:X) + (16 « M)
–
–
–
–
–
–
–
–
–
–
– IMM
– IMM
A7
AF
ii
ii
2
2
AND #opr
AND opr
AND opr
AND opr,X
AND opr,X
AND ,X
AND opr,SP
AND opr,SP
IMM
DIR
EXT
IX2
IX1
IX
SP1
SP2
A4
B4
C4
D4
E4
F4
ii
2
3
4
4
3
2
4
5
dd
hh ll
ee ff
ff
Logical AND
A ← (A) & (M)
0
–
–
–
–
↕ ↕
–
9EE4 ff
9ED4 ee ff
ASL opr
ASLA
ASLX
ASL opr,X
ASL ,X
ASL opr,SP
DIR
INH
INH
IX1
IX
38
48
58
68
78
dd
ff
4
1
1
4
3
5
Arithmetic Shift Left
(Same as LSL)
↕
↕ ↕ ↕
C
0
b7
b7
b0
b0
SP1
9E68 ff
ASR opr
ASRA
ASRX
ASR opr,X
ASR opr,X
ASR opr,SP
DIR
INH
INH
IX1
IX
37
47
57
67
77
dd
4
1
1
4
3
5
C
Arithmetic Shift Right
↕
–
–
–
–
↕
↕
↕
ff
SP1
9E67 ff
BCC rel
Branch if Carry Bit Clear
PC ← (PC) + 2 + rel ? (C) = 0
–
–
–
– REL
24
rr
3
DIR (b0)
11
13
15
17
19
1B
1D
1F
dd
dd
dd
dd
dd
dd
dd
dd
4
4
4
4
4
4
4
4
DIR (b1)
DIR (b2)
DIR (b3)
DIR (b4)
DIR (b5)
DIR (b6)
DIR (b7)
BCLR n, opr
Clear Bit n in M
Mn ← 0
–
–
–
–
–
–
Technical Data
66
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
Central Processor Unit (CPU) MOTOROLA
Central Processor Unit (CPU)
Opcode Map
Table 6-1. Instruction Set Summary
Effect on
CCR
Source
Form
Operation
Description
V H
I
N Z
C
BCS rel
Branch if Carry Bit Set (Same as BLO)
Branch if Equal
PC ← (PC) + 2 + rel ? (C) = 1
PC ← (PC) + 2 + rel ? (Z) = 1
–
–
–
–
–
–
–
–
–
–
– REL
– REL
25
27
rr
rr
3
3
BEQ rel
BGE opr
Branch if Greater Than or Equal To
(Signed Operands)
PC ← (PC) + 2 + rel ? (N ⊕ V) = 0
–
–
–
–
–
–
–
–
–
– REL
– REL
90
92
rr
rr
3
Branch if Greater Than (Signed
Operands)
BGT opr
PC ← (PC) + 2 +rel ? (Z) | (N ⊕ V)=0 –
3
3
BHCC rel
BHCS rel
BHI rel
Branch if Half Carry Bit Clear
Branch if Half Carry Bit Set
Branch if Higher
PC ← (PC) + 2 + rel ? (H) = 0
PC ← (PC) + 2 + rel ? (H) = 1
PC ← (PC) + 2 + rel ? (C) | (Z) = 0
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
– REL
– REL
– REL
28
29
22
rr
rr
rr
3
3
3
Branch if Higher or Same
(Same as BCC)
BHS rel
PC ← (PC) + 2 + rel ? (C) = 0
–
–
–
–
–
– REL
24
rr
BIH rel
BIL rel
Branch if IRQ Pin High
Branch if IRQ Pin Low
PC ← (PC) + 2 + rel ? IRQ = 1
PC ← (PC) + 2 + rel ? IRQ = 0
–
–
–
–
–
–
–
–
–
–
– REL
– REL
2F
2E
rr
rr
3
3
BIT #opr
BIT opr
BIT opr
BIT opr,X
BIT opr,X
BIT ,X
BIT opr,SP
BIT opr,SP
IMM
DIR
EXT
IX2
IX1
IX
SP1
SP2
A5
B5
C5
D5
E5
F5
ii
2
3
4
4
3
2
4
5
dd
hh ll
ee ff
ff
Bit Test
(A) & (M)
0
–
–
↕
↕
–
9EE5 ff
9ED5 ee ff
Branch if Less Than or Equal To
(Signed Operands)
BLE opr
PC ← (PC) + 2 + rel ? (Z) | (N ⊕ V)=1 –
–
–
–
–
– REL
93
rr
3
BLO rel
BLS rel
BLT opr
BMC rel
BMI rel
BMS rel
BNE rel
BPL rel
BRA rel
Branch if Lower (Same as BCS)
Branch if Lower or Same
PC ← (PC) + 2 + rel ? (C) = 1
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
– REL
– REL
– REL
– REL
– REL
– REL
– REL
– REL
– REL
25
23
91
2C
2B
2D
26
2A
20
rr
rr
rr
rr
rr
rr
rr
rr
rr
3
3
3
3
3
3
3
3
3
PC ← (PC) + 2 + rel ? (C) | (Z) = 1
Branch if Less Than (Signed Operands) PC ← (PC) + 2 + rel ? (N ⊕ V) = 1
Branch if Interrupt Mask Clear
Branch if Minus
PC ← (PC) + 2 + rel ? (I) = 0
PC ← (PC) + 2 + rel ? (N) = 1
PC ← (PC) + 2 + rel ? (I) = 1
PC ← (PC) + 2 + rel ? (Z) = 0
PC ← (PC) + 2 + rel ? (N) = 0
PC ← (PC) + 2 + rel
Branch if Interrupt Mask Set
Branch if Not Equal
Branch if Plus
Branch Always
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA Central Processor Unit (CPU)
Technical Data
67
Central Processor Unit (CPU)
Table 6-1. Instruction Set Summary
Effect on
CCR
Source
Operation
Form
Description
V H
I
N Z
C
DIR (b0)
DIR (b1)
DIR (b2)
DIR (b3)
DIR (b4)
DIR (b5)
DIR (b6)
DIR (b7)
01
03
05
07
09
0B
0D
0F
dd rr
dd rr
dd rr
dd rr
dd rr
dd rr
dd rr
dd rr
5
5
5
5
5
5
5
5
BRCLR n,opr,rel Branch if Bit n in M Clear
PC ← (PC) + 3 + rel ? (Mn) = 0
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
↕
BRN rel
Branch Never
PC ← (PC) + 2
– REL
DIR (b0)
21
rr
3
00
02
04
06
08
0A
0C
0E
dd rr
dd rr
dd rr
dd rr
dd rr
dd rr
dd rr
dd rr
5
5
5
5
5
5
5
5
DIR (b1)
DIR (b2)
DIR (b3)
DIR (b4)
DIR (b5)
DIR (b6)
DIR (b7)
BRSET n,opr,rel Branch if Bit n in M Set
PC ← (PC) + 3 + rel ? (Mn) = 1
↕
DIR (b0)
DIR (b1)
DIR (b2)
DIR (b3)
DIR (b4)
DIR (b5)
DIR (b6)
DIR (b7)
10
12
14
16
18
1A
1C
1E
dd
dd
dd
dd
dd
dd
dd
dd
4
4
4
4
4
4
4
4
BSET n,opr
Set Bit n in M
Mn ← 1
–
–
–
–
–
–
PC ← (PC) + 2; push (PCL)
SP ← (SP) – 1; push (PCH)
SP ← (SP) – 1
BSR rel
Branch to Subroutine
–
–
–
–
–
–
–
–
–
–
– REL
AD
rr
4
PC ← (PC) + rel
CBEQ opr,rel
PC ← (PC) + 3 + rel ? (A) – (M) = $00
PC ← (PC) + 3 + rel ? (A) – (M) = $00
PC ← (PC) + 3 + rel ? (X) – (M) = $00
PC ← (PC) + 3 + rel ? (A) – (M) = $00
PC ← (PC) + 2 + rel ? (A) – (M) = $00
PC ← (PC) + 4 + rel ? (A) – (M) = $00
DIR
IMM
31
41
51
61
71
dd rr
ii rr
ii rr
ff rr
rr
5
4
4
5
4
6
CBEQA #opr,rel
CBEQX #opr,rel
CBEQ opr,X+,rel
CBEQ X+,rel
IMM
IX1+
Compare and Branch if Equal
–
IX+
SP1
CBEQ opr,SP,rel
9E61 ff rr
CLC
CLI
Clear Carry Bit
C ← 0
I ← 0
–
–
–
–
–
0
–
–
–
–
0 INH
– INH
98
9A
1
2
Clear Interrupt Mask
CLR opr
CLRA
CLRX
CLRH
CLR opr,X
CLR ,X
M ← $00
A ← $00
X ← $00
H ← $00
M ← $00
M ← $00
M ← $00
DIR
INH
INH
– INH
IX1
IX
3F
4F
5F
8C
6F
7F
dd
ff
3
1
1
1
3
2
4
Clear
0
–
–
0
1
CLR opr,SP
SP1
9E6F ff
Technical Data
68
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
Central Processor Unit (CPU) MOTOROLA
Central Processor Unit (CPU)
Opcode Map
Table 6-1. Instruction Set Summary
Effect on
CCR
Source
Form
Operation
Description
V H
I
N Z
C
CMP #opr
CMP opr
CMP opr
CMP opr,X
CMP opr,X
CMP ,X
CMP opr,SP
CMP opr,SP
IMM
DIR
EXT
IX2
IX1
IX
A1
B1
C1
D1
E1
F1
ii
2
3
4
4
3
2
4
5
dd
hh ll
ee ff
ff
Compare A with M
(A) – (M)
↕
–
–
↕
↕
↕
SP1
SP2
9EE1 ff
9ED1 ee ff
COM opr
COMA
COMX
COM opr,X
COM ,X
COM opr,SP
M ← (M) = $FF – (M)
A ← (A) = $FF – (M)
X ← (X) = $FF – (M)
M ← (M) = $FF – (M)
M ← (M) = $FF – (M)
M ← (M) = $FF – (M)
DIR
INH
INH
IX1
IX
33
43
53
63
73
dd
ff
4
1
1
4
3
5
Complement (One’s Complement)
Compare H:X with M
0
–
–
–
–
↕
↕
↕
↕
1
SP1
9E63 ff
CPHX #opr
CPHX opr
IMM
DIR
65
75
ii ii+1
dd
3
4
(H:X) – (M:M + 1)
↕
↕
CPX #opr
CPX opr
CPX opr
IMM
DIR
EXT
IX2
IX1
IX
A3
B3
C3
D3
E3
F3
ii
2
3
4
4
3
2
4
5
dd
hh ll
ee ff
ff
CPX ,X
Compare X with M
(X) – (M)
↕
–
–
↕
↕
↕
↕
CPX opr,X
CPX opr,X
CPX opr,SP
CPX opr,SP
SP1
SP2
9EE3 ff
9ED3 ee ff
DAA
Decimal Adjust A
(A)
U –
–
–
↕
↕
INH
72
2
10
A ← (A)–1 or M ← (M)–1 or X ← (X)–1
PC ← (PC) + 3 + rel ? (result) ≠ 0
PC ← (PC) + 2 + rel ? (result) ≠ 0
PC ← (PC) + 2 + rel ? (result) ≠ 0
PC ← (PC) + 3 + rel ? (result) ≠ 0
PC ← (PC) + 2 + rel ? (result) ≠ 0
PC ← (PC) + 4 + rel ? (result) ≠ 0
5
3
3
5
4
6
DBNZ opr,rel
DBNZA rel
DBNZX rel
DBNZ opr,X,rel
DBNZ X,rel
DBNZ opr,SP,rel
DIR
INH
– INH
IX1
IX
SP1
3B
4B
5B
6B
7B
dd rr
rr
rr
ff rr
rr
Decrement and Branch if Not Zero
–
–
–
–
9E6B ff rr
DEC opr
DECA
DECX
DEC opr,X
DEC ,X
DEC opr,SP
M ← (M) – 1
A ← (A) – 1
X ← (X) – 1
M ← (M) – 1
M ← (M) – 1
M ← (M) – 1
DIR
INH
INH
IX1
IX
3A
4A
5A
6A
7A
dd
ff
4
1
1
4
3
5
Decrement
Divide
↕
–
–
–
–
↕
↕
↕
–
SP1
9E6A ff
A ← (H:A)/(X)
H ← Remainder
DIV
–
–
↕
INH
52
7
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA Central Processor Unit (CPU)
Technical Data
69
Central Processor Unit (CPU)
Table 6-1. Instruction Set Summary
Effect on
CCR
Source
Operation
Form
Description
V H
I
N Z
C
EOR #opr
EOR opr
EOR opr
EOR opr,X
EOR opr,X
EOR ,X
EOR opr,SP
EOR opr,SP
IMM
DIR
EXT
IX2
IX1
IX
A8
B8
C8
D8
E8
F8
ii
2
3
4
4
3
2
4
5
dd
hh ll
ee ff
ff
Exclusive OR M with A
A ← (A ⊕ M)
0
–
–
–
↕
↕
–
SP1
SP2
9EE8 ff
9ED8 ee ff
INC opr
INCA
INCX
INC opr,X
INC ,X
INC opr,SP
M ← (M) + 1
A ← (A) + 1
X ← (X) + 1
M ← (M) + 1
M ← (M) + 1
M ← (M) + 1
DIR
INH
INH
IX1
IX
3C
4C
5C
6C
7C
dd
ff
4
1
1
4
3
5
Increment
↕
–
↕
↕
–
SP1
9E6C ff
JMP opr
JMP opr
JMP opr,X
JMP opr,X
JMP ,X
DIR
EXT
– IX2
IX1
IX
BC
CC
DC
EC
FC
dd
2
3
4
3
2
hh ll
ee ff
ff
Jump
PC ← Jump Address
–
–
–
–
–
–
–
–
–
–
JSR opr
JSR opr
JSR opr,X
JSR opr,X
JSR ,X
DIR
EXT
– IX2
IX1
BD
CD
DD
ED
FD
dd
4
5
6
5
4
PC ← (PC) + n (n = 1, 2, or 3)
Push (PCL); SP ← (SP) – 1
Push (PCH); SP ← (SP) – 1
PC ← Unconditional Address
hh ll
ee ff
ff
Jump to Subroutine
IX
LDA #opr
LDA opr
LDA opr
LDA opr,X
LDA opr,X
LDA ,X
LDA opr,SP
LDA opr,SP
IMM
DIR
EXT
IX2
IX1
IX
SP1
SP2
A6
B6
C6
D6
E6
F6
ii
2
3
4
4
3
2
4
5
dd
hh ll
ee ff
ff
Load A from M
Load H:X from M
Load X from M
A ← (M)
H:X ← (M:M + 1)
X ← (M)
0
0
0
–
–
–
–
–
–
↕
↕
↕
↕
↕
↕
–
9EE6 ff
9ED6 ee ff
LDHX #opr
LDHX opr
IMM
–
45
55
ii jj
dd
3
4
DIR
LDX #opr
LDX opr
LDX opr
LDX opr,X
LDX opr,X
LDX ,X
LDX opr,SP
LDX opr,SP
IMM
DIR
EXT
IX2
IX1
IX
SP1
SP2
AE
BE
CE
DE
EE
FE
ii
2
3
4
4
3
2
4
5
dd
hh ll
ee ff
ff
–
9EEE ff
9EDE ee ff
LSL opr
LSLA
LSLX
LSL opr,X
LSL ,X
LSL opr,SP
DIR
INH
INH
IX1
IX
38
48
58
68
78
dd
ff
4
1
1
4
3
5
Logical Shift Left
(Same as ASL)
C
0
↕
–
–
↕
↕
↕
b7
b0
SP1
9E68 ff
Technical Data
70
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
Central Processor Unit (CPU) MOTOROLA
Central Processor Unit (CPU)
Opcode Map
Table 6-1. Instruction Set Summary
Effect on
CCR
Source
Form
Operation
Description
V H
I
N Z
C
LSR opr
LSRA
LSRX
LSR opr,X
LSR ,X
DIR
INH
INH
IX1
IX
34
44
54
64
74
dd
ff
4
1
1
4
3
5
0
C
Logical Shift Right
↕
–
–
0
↕
↕
b7
b0
LSR opr,SP
SP1
9E64 ff
MOV opr,opr
MOV opr,X+
MOV #opr,opr
MOV X+,opr
DD
4E
5E
6E
7E
dd dd
dd
ii dd
dd
5
4
4
4
(M)
← (M)
Source
Destination
DIX+
IMD
IX+D
Move
0
–
–
0
–
–
↕
↕
–
H:X ← (H:X) + 1 (IX+D, DIX+)
X:A ← (X) × (A)
MUL
Unsigned multiply
–
–
0 INH
42
5
NEG opr
NEGA
NEGX
NEG opr,X
NEG ,X
NEG opr,SP
DIR
INH
INH
IX1
IX
30
40
50
60
70
dd
ff
4
1
1
4
3
5
M ← –(M) = $00 – (M)
A ← –(A) = $00 – (A)
X ← –(X) = $00 – (X)
M ← –(M) = $00 – (M)
M ← –(M) = $00 – (M)
Negate (Two’s Complement)
↕
–
–
↕
↕
↕
SP1
9E60 ff
NOP
NSA
No Operation
Nibble Swap A
None
–
–
–
–
–
–
–
–
–
–
– INH
– INH
9D
1
3
A ← (A[3:0]:A[7:4])
62
ORA #opr
ORA opr
ORA opr
ORA opr,X
ORA opr,X
ORA ,X
ORA opr,SP
ORA opr,SP
IMM
DIR
EXT
IX2
IX1
IX
SP1
SP2
AA
BA
CA
DA
EA
FA
ii
2
3
4
4
3
2
4
5
dd
hh ll
ee ff
ff
Inclusive OR A and M
A ← (A) | (M)
0
–
–
↕
↕
–
9EEA ff
9EDA ee ff
PSHA
PSHH
PSHX
PULA
PULH
PULX
Push A onto Stack
Push H onto Stack
Push X onto Stack
Pull A from Stack
Pull H from Stack
Pull X from Stack
Push (A); SP ← (SP) – 1
Push (H); SP ← (SP) – 1
Push (X); SP ← (SP) – 1
SP ← (SP + 1); Pull (A)
SP ← (SP + 1); Pull (H)
SP ← (SP + 1); Pull (X)
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
– INH
– INH
– INH
– INH
– INH
– INH
87
8B
89
86
8A
88
2
2
2
2
2
2
ROL opr
ROLA
ROLX
ROL opr,X
ROL ,X
ROL opr,SP
DIR
INH
INH
IX1
IX
39
49
59
69
79
dd
ff
4
1
1
4
3
5
C
Rotate Left through Carry
↕
–
–
↕
↕
↕
b7
b0
SP1
9E69 ff
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA Central Processor Unit (CPU)
Technical Data
71
Central Processor Unit (CPU)
Table 6-1. Instruction Set Summary
Effect on
CCR
Source
Operation
Form
Description
V H
I
N Z
C
ROR opr
RORA
DIR
INH
INH
IX1
IX
36
46
56
66
76
dd
ff
4
1
1
4
3
5
RORX
C
Rotate Right through Carry
ROR opr,X
↕
–
–
↕
↕
↕
b7
b0
ROR ,X
ROR opr,SP
SP1
9E66 ff
RSP
Reset Stack Pointer
Return from Interrupt
SP ← $FF
–
–
–
–
–
– INH
9C
1
SP ← (SP) + 1; Pull (CCR)
SP ← (SP) + 1; Pull (A)
SP ← (SP) + 1; Pull (X)
SP ← (SP) + 1; Pull (PCH)
SP ← (SP) + 1; Pull (PCL)
RTI
↕
↕
↕
↕
↕
↕
INH
80
81
7
SP ← SP + 1; Pull (PCH)
SP ← SP + 1; Pull (PCL)
RTS
Return from Subroutine
Subtract with Carry
–
–
–
–
–
–
–
– INH
4
SBC #opr
SBC opr
SBC opr
SBC opr,X
SBC opr,X
SBC ,X
SBC opr,SP
SBC opr,SP
IMM
DIR
EXT
A2
B2
C2
D2
E2
F2
ii
2
3
4
4
3
2
4
5
dd
hh ll
ee ff
ff
IX2
IX1
A ← (A) – (M) – (C)
↕
↕
↕
↕
IX
SP1
SP2
9EE2 ff
9ED2 ee ff
SEC
SEI
Set Carry Bit
C ← 1
I ← 1
–
–
–
–
–
1
–
–
–
–
1 INH
– INH
99
9B
1
2
Set Interrupt Mask
STA opr
STA opr
DIR
EXT
IX2
– IX1
IX
B7
C7
D7
E7
F7
dd
3
4
4
3
2
4
5
hh ll
ee ff
ff
STA opr,X
STA opr,X
STA ,X
STA opr,SP
STA opr,SP
Store A in M
M ← (A)
0
–
–
↕
↕
SP1
SP2
9EE7 ff
9ED7 ee ff
STHX opr
Store H:X in M
(M:M + 1) ← (H:X)
0
–
–
–
–
0
↕
↕
– DIR
– INH
35
8E
dd
4
1
STOP
Enable IRQ Pin; Stop Oscillator
I ← 0; Stop Oscillator
–
–
STX opr
STX opr
DIR
EXT
IX2
– IX1
IX
BF
CF
DF
EF
FF
dd
3
4
4
3
2
4
5
hh ll
ee ff
ff
STX opr,X
STX opr,X
STX ,X
STX opr,SP
STX opr,SP
Store X in M
M ← (X)
0
–
–
↕
↕
SP1
SP2
9EEF ff
9EDF ee ff
Technical Data
72
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
Central Processor Unit (CPU) MOTOROLA
Central Processor Unit (CPU)
Opcode Map
Table 6-1. Instruction Set Summary
Effect on
CCR
Source
Form
Operation
Description
V H
I
N Z
C
SUB #opr
SUB opr
SUB opr
SUB opr,X
SUB opr,X
SUB ,X
SUB opr,SP
SUB opr,SP
IMM
DIR
EXT
IX2
IX1
IX
A0
B0
C0
D0
E0
F0
ii
2
3
4
4
3
2
4
5
dd
hh ll
ee ff
ff
Subtract
A ← (A) – (M)
↕
–
–
↕
↕
↕
SP1
SP2
9EE0 ff
9ED0 ee ff
PC ← (PC) + 1; Push (PCL)
SP ← (SP) – 1; Push (PCH)
SP ← (SP) – 1; Push (X)
SP ← (SP) – 1; Push (A)
SP ← (SP) – 1; Push (CCR)
SP ← (SP) – 1; I ← 1
SWI
Software Interrupt
–
–
1
–
–
– INH
83
9
PCH ← Interrupt Vector High Byte
PCL ← Interrupt Vector Low Byte
TAP
TAX
TPA
Transfer A to CCR
Transfer A to X
CCR ← (A)
X ← (A)
↕
↕
↕
↕
↕
↕
INH
84
97
85
2
1
1
–
–
–
–
–
–
–
–
–
–
– INH
– INH
Transfer CCR to A
A ← (CCR)
TST opr
TSTA
TSTX
TST opr,X
TST ,X
TST opr,SP
DIR
INH
INH
IX1
IX
3D
4D
5D
6D
7D
dd
ff
3
1
1
3
2
4
Test for Negative or Zero
(A) – $00 or (X) – $00 or (M) – $00
0
–
–
↕
↕
–
SP1
9E6D ff
TSX
TXA
TXS
Transfer SP to H:X
Transfer X to A
H:X ← (SP) + 1
A ← (X)
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
– INH
– INH
– INH
95
9F
94
2
1
2
Transfer H:X to SP
(SP) ← (H:X) – 1
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA Central Processor Unit (CPU)
Technical Data
73
Central Processor Unit (CPU)
Table 6-1. Instruction Set Summary
Effect on
CCR
Source
Operation
Form
Description
V H
I N Z C
A
C
Accumulator
Carry/borrow bit
n
Any bit
opr Operand (one or two bytes)
PC Program counter
PCH Program counter high byte
PCL Program counter low byte
REL Relative addressing mode
CCR Condition code register
dd Direct address of operand
dd rr Direct address of operand and relative offset of branch instruction
DD
DIR
DIX+ Direct to indexed with post increment addressing mode
ee ff High and low bytes of offset in indexed, 16-bit offset addressing
EXT Extended addressing mode
ff
H
H
Direct to direct addressing mode
Direct addressing mode
rel
rr
Relative program counter offset byte
Relative program counter offset byte
SP1 Stack pointer, 8-bit offset addressing mode
SP2 Stack pointer 16-bit offset addressing mode
SP Stack pointer
U
V
X
Z
Offset byte in indexed, 8-bit offset addressing
Half-carry bit
Index register high byte
Undefined
Overflow bit
Index register low byte
Zero bit
hh ll High and low bytes of operand address in extended addressing
I
Interrupt mask
ii
Immediate operand byte
&
|
Logical AND
Logical OR
Logical EXCLUSIVE OR
Contents of
IMD Immediate source to direct destination addressing mode
IMM Immediate addressing mode
INH
IX
⊕
Inherent addressing mode
Indexed, no offset addressing mode
Indexed, no offset, post increment addressing mode
( )
–( ) Negation (two’s complement)
#
«
←
?
IX+
Immediate value
Sign extend
Loaded with
If
IX+D Indexed with post increment to direct addressing mode
IX1 Indexed, 8-bit offset addressing mode
IX1+ Indexed, 8-bit offset, post increment addressing mode
IX2
M
N
Indexed, 16-bit offset addressing mode
Memory location
Negative bit
:
↕
Concatenated with
Set or cleared
Not affected
—
Technical Data
74
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
Central Processor Unit (CPU)
MOTOROLA
Table 6-2. Opcode Map
Bit Manipulation Branch
Read-Modify-Write
Control
Register/Memory
DIR
DIR
REL
DIR
3
INH
4
INH
IX1
SP1
9E6
IX
7
INH
INH
IMM
A
DIR
B
EXT
C
IX2
SP2
IX1
E
SP1
9EE
IX
F
MSB
0
1
2
5
6
8
9
D
9ED
LSB
5
4
3
4
1
NEGA
INH
1
NEGX
INH
4
5
3
7
3
2
3
4
4
5
3
4
2
0
BRSET0 BSET0
BRA
NEG
NEG
NEG
NEG
IX
RTI
BGE
SUB
SUB
SUB
SUB
SUB
SUB
SUB
SUB
IX
3
DIR
5
2
DIR
4
2
2
2
2
2
2
2
2
REL 2 DIR
1
1
2
IX1 3 SP1
5
1
2
1
1
1
2
1
1
1
1
1
2
1
1
2
1
1
1
INH
2
2
2
2
1
1
REL 2 IMM 2 DIR
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
EXT 3 IX2
4
4
4
4
4
4
4
4
4
4
4
4
SP2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
IX1
3
3
3
3
3
3
3
3
3
3
3
3
SP1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
3
BRN
REL 3 DIR
5
4
4
6
CBEQ
SP1
4
CBEQ
IX+
2
DAA
INH
3
COM
IX
3
LSR
IX
4
CPHX
DIR
3
ROR
IX
3
ASR
IX
3
LSL
IX
3
ROL
IX
3
DEC
IX
4
DBNZ
IX
3
INC
IX
4
3
BLT
2
CMP
3
4
4
5
3
4
2
CMP
IX
2
SBC
IX
2
CPX
IX
2
AND
IX
2
BIT
IX
2
LDA
IX
2
STA
IX
2
EOR
IX
2
ADC
IX
2
ORA
IX
2
ADD
IX
2
JMP
IX
4
JSR
IX
2
LDX
IX
2
STX
IX
1
2
BRCLR0 BCLR0
CBEQ CBEQA CBEQX CBEQ
RTS
CMP
CMP
CMP
CMP
CMP
CMP
3
DIR
5
2
DIR
4
3
IMM 3 IMM 3 IX1+
4
INH
REL 2 IMM 2 DIR
EXT 3 IX2
SP2
IX1
SP1
3
5
7
3
3
BGT
2
SBC
3
SBC
4
SBC
EXT 3 IX2
4
CPX
EXT 3 IX2
4
AND
EXT 3 IX2
4
BIT
EXT 3 IX2
4
LDA
EXT 3 IX2
4
STA
EXT 3 IX2
4
EOR
EXT 3 IX2
4
ADC
EXT 3 IX2
4
ORA
EXT 3 IX2
4
ADD
EXT 3 IX2
3
JMP
EXT 3 IX2
5
JSR
EXT 3 IX2
4
LDX
EXT 3 IX2
4
STX
EXT 3 IX2
4
SBC
5
3
4
BRSET1 BSET1
BHI
MUL
INH
DIV
INH
NSA
SBC
SBC
SBC
3
DIR
5
2
DIR
4
REL
1
1
1
2
2
3
2
2
2
2
2
INH
REL 2 IMM 2 DIR
SP2
IX1
SP1
3
BLS
REL 2 DIR
3
BCC
REL 2 DIR
3
BCS
REL 2 DIR
3
BNE
REL 2 DIR
4
1
1
4
COM
IX1
4
LSR
IX1
3
CPHX
IMM
4
ROR
IX1
4
ASR
IX1
4
LSL
IX1
4
ROL
IX1
4
DEC
IX1
5
COM
SP1
5
LSR
SP1
9
3
BLE
2
CPX
3
CPX
4
CPX
5
3
4
3
BRCLR1 BCLR1
COM
COMA
COMX
SWI
CPX
CPX
CPX
3
DIR
5
2
DIR
4
1
INH
1
INH
3
3
1
1
1
1
1
1
1
1
1
1
INH
REL 2 IMM 2 DIR
SP2
IX1
SP1
4
LSR
1
LSRA
INH
1
LSRX
INH
2
2
2
AND
IMM 2 DIR
3
AND
4
AND
5
3
4
4
BRSET2 BSET2
TAP
TXS
AND
AND
AND
3
DIR
5
2
DIR
4
1
3
1
1
1
1
1
1
INH
INH
2
2
2
2
2
2
2
2
SP2
IX1
SP1
4
3
4
1
2
2
BIT
3
BIT
4
BIT
5
BIT
SP2
3
4
BIT
SP1
5
BRCLR2 BCLR2
STHX
LDHX
LDHX
TPA
TSX
BIT
3
DIR
5
2
DIR
4
IMM 2 DIR
INH
INH
IMM 2 DIR
IX1
4
ROR
1
RORA
INH
1
ASRA
INH
1
LSLA
INH
1
ROLA
INH
1
5
ROR
SP1
5
ASR
SP1
5
LSL
SP1
5
ROL
SP1
5
DEC
SP1
6
DBNZ
SP1
5
INC
SP1
4
TST
SP1
2
PULA
INH
2
PSHA
INH
2
PULX
INH
2
PSHX
INH
2
PULH
INH
2
PSHH
INH
1
CLRH
INH
2
LDA
IMM 2 DIR
2
AIS
IMM 2 DIR
2
EOR
IMM 2 DIR
2
ADC
IMM 2 DIR
2
ORA
IMM 2 DIR
2
ADD
IMM 2 DIR
3
LDA
4
LDA
5
3
4
6
BRSET3 BSET3
RORX
LDA
LDA
LDA
3
DIR
5
2
DIR
4
1
INH
3
3
3
3
3
4
3
3
SP2
IX1
SP1
3
BEQ
REL 2 DIR
3
4
ASR
1
ASRX
INH
1
LSLX
INH
1
ROLX
INH
1
DECX
INH
1
3
STA
4
STA
5
3
4
7
BRCLR3 BCLR3
TAX
STA
STA
STA
3
DIR
5
2
DIR
4
1
1
1
1
1
1
1
1
1
1
1
INH
SP2
IX1
SP1
4
LSL
1
3
EOR
4
EOR
5
3
4
8
BRSET4 BSET4 BHCC
CLC
EOR
EOR
EOR
3
DIR
5
2
DIR
4
2
REL 2 DIR
3
INH
SP2
IX1
SP1
4
ROL
1
3
ADC
4
ADC
5
3
4
9
BRCLR4 BCLR4 BHCS
SEC
ADC
ADC
ADC
3
DIR
5
2
DIR
4
2
2
2
2
2
2
2
REL 2 DIR
INH
SP2
IX1
SP1
3
BPL
REL 2 DIR
3
BMI
REL 3 DIR
4
DEC
1
DECA
INH
2
3
ORA
4
ORA
5
3
4
A
B
C
D
E
F
BRSET5 BSET5
CLI
ORA
ORA
ORA
3
DIR
5
2
DIR
4
INH
SP2
IX1
SP1
5
3
3
5
2
3
ADD
4
ADD
5
3
4
BRCLR5 BCLR5
DBNZ DBNZA DBNZX DBNZ
SEI
ADD
ADD
ADD
3
DIR
5
2
DIR
4
2
1
1
3
1
INH
1
2
1
1
2
1
INH
1
3
2
2
3
2
IX1
4
INH
SP2
IX1
SP1
3
4
INC
1
2
JMP
4
JMP
3
BRSET6 BSET6
BMC
INCA
INCX
INC
RSP
JMP
3
DIR
5
2
DIR
4
REL 2 DIR
INH
1
INH
1
IX1
3
INH
2
DIR
4
IX1
3
BMS
3
TST
2
TST
IX
1
4
BSR
REL 2 DIR
2
LDX
IMM 2 DIR
2
AIX
IMM 2 DIR
6
JSR
5
BRCLR6 BCLR6
TSTA
TSTX
TST
NOP
JSR
JSR
3
DIR
5
2
DIR
4
REL 2 DIR
3
INH
5
INH
4
IX1
4
INH
2
2
2
IX1
4
1
STOP
INH
1
WAIT
INH
3
LDX
4
LDX
5
3
4
BRSET7 BSET7
BIL
MOV
MOV
MOV
MOV
IX+D
LDX
LDX
LDX
*
1
TXA
INH
3
DIR
5
2
DIR
4
REL
3
DD
DIX+
IMD
3
1
1
4
4
SP2
IX1
3
3
SP1
3
CLR
1
CLRA
INH
1
CLRX
INH
4
CLR
SP1
2
CLR
IX
3
STX
4
STX
5
3
4
BRCLR7 BCLR7
BIH
CLR
STX
STX
STX
3
DIR
2
DIR
REL 2 DIR
IX1
3
1
SP2
IX1
SP1
INH Inherent
REL Relative
SP1 Stack Pointer, 8-Bit Offset
SP2 Stack Pointer, 16-Bit Offset
IX+ Indexed, No Offset with
Post Increment
IX1+ Indexed, 1-Byte Offset with
Post Increment
MSB
LSB
0
High Byte of Opcode in Hexadecimal
Cycles
IMM Immediate
DIR Direct
IX
Indexed, No Offset
IX1 Indexed, 8-Bit Offset
IX2 Indexed, 16-Bit Offset
IMD Immediate-Direct
EXT Extended
DD Direct-Direct
IX+D Indexed-Direct DIX+ Direct-Indexed
*Pre-byte for stack pointer indexed instructions
5
Low Byte of Opcode in Hexadecimal
0
BRSET0 Opcode Mnemonic
DIR Number of Bytes / Addressing Mode
3
Central Processor Unit (CPU)
Technical Data
76
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
Central Processor Unit (CPU) MOTOROLA
Technical Data – MC68H(R)C908JL3E/JK3E/JK1E
Section 7. System Integration Module (SIM)
7.1 Contents
7.2
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78
7.3
SIM Bus Clock Control and Generation . . . . . . . . . . . . . . . . . .81
Bus Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81
Clock Start-Up from POR. . . . . . . . . . . . . . . . . . . . . . . . . . .81
Clocks in Stop Mode and Wait Mode . . . . . . . . . . . . . . . . . .81
7.3.1
7.3.2
7.3.3
7.4
7.4.1
7.4.2
7.4.2.1
7.4.2.2
7.4.2.3
7.4.2.4
7.4.2.5
Reset and System Initialization. . . . . . . . . . . . . . . . . . . . . . . . .82
External Pin Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82
Active Resets from Internal Sources . . . . . . . . . . . . . . . . . .83
Power-On Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84
Computer Operating Properly (COP) Reset. . . . . . . . . . .85
Illegal Opcode Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . .85
Illegal Address Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . .85
LVI Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86
7.5
SIM Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86
SIM Counter During Power-On Reset . . . . . . . . . . . . . . . . .86
SIM Counter During Stop Mode Recovery. . . . . . . . . . . . . .86
SIM Counter and Reset States. . . . . . . . . . . . . . . . . . . . . . .87
7.5.1
7.5.2
7.5.3
7.6
7.6.1
Exception Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87
Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87
Hardware Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89
SWI Instruction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91
Interrupt Status Registers. . . . . . . . . . . . . . . . . . . . . . . . . . .91
Interrupt Status Register 1 . . . . . . . . . . . . . . . . . . . . . . .92
Interrupt Status Register 2. . . . . . . . . . . . . . . . . . . . . . . .92
Interrupt Status Register 3. . . . . . . . . . . . . . . . . . . . . . . .93
Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93
Break Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93
Status Flag Protection in Break Mode . . . . . . . . . . . . . . . . .94
7.6.1.1
7.6.1.2
7.6.2
7.6.2.1
7.6.2.2
7.6.2.3
7.6.3
7.6.4
7.6.5
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA System Integration Module (SIM)
Technical Data
77
System Integration Module (SIM)
7.7
Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94
7.7.1
7.7.2
Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96
7.8
SIM Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97
Break Status Register (BSR) . . . . . . . . . . . . . . . . . . . . . . . .97
Reset Status Register (RSR) . . . . . . . . . . . . . . . . . . . . . . . .98
Break Flag Control Register (BFCR) . . . . . . . . . . . . . . . . .100
7.8.1
7.8.2
7.8.3
7.2 Introduction
This section describes the system integration module (SIM), which
supports up to 24 external and/or internal interrupts. Together with the
CPU, the SIM controls all MCU activities. A block diagram of the SIM is
shown in Figure 7-1. Figure 7-2 is a summary of the SIM I/O registers.
The SIM is a system state controller that coordinates CPU and exception
timing. The SIM is responsible for:
• Bus clock generation and control for CPU and peripherals
– Stop/wait/reset/break entry and recovery
– Internal clock control
• Master reset control, including power-on reset (POR) and COP
timeout
• Interrupt control:
– Acknowledge timing
– Arbitration control timing
– Vector address generation
• CPU enable/disable timing
• Modular architecture expandable to 128 interrupt sources
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System Integration Module (SIM)
MOTOROLA
System Integration Module (SIM)
Introduction
MODULE STOP
MODULE WAIT
CPU STOP (FROM CPU)
CPU WAIT (FROM CPU)
STOP/WAIT
CONTROL
SIMOSCEN (TO OSCILLATOR)
SIM
COUNTER
COP CLOCK
2OSCOUT (FROM OSCILLATOR)
OSCOUT (FROM OSCILLATOR)
÷2
VDD
CLOCK
CONTROL
CLOCK GENERATORS
INTERNAL CLOCKS
INTERNAL
PULL-UP
ILLEGAL OPCODE (FROM CPU)
ILLEGAL ADDRESS (FROM ADDRESS
MAP DECODERS)
RESET
PIN LOGIC
POR CONTROL
RESET PIN CONTROL
MASTER
RESET
CONTROL
COP TIMEOUT (FROM COP MODULE)
USB RESET (FROM USB MODULE)
SIM RESET STATUS REGISTER
RESET
INTERRUPT SOURCES
CPU INTERFACE
INTERRUPT CONTROL
AND PRIORITY DECODE
Figure 7-1. SIM Block Diagram
Table 7-1. Signal Name Conventions
Signal Name
Description
2OSCOUT
Buffered clock from the X-tal oscillator circuit or the RC oscillator circuit.
The 2OSCOUT frequency divided by two. This signal is again divided by two in the
SIM to generate the internal bus clocks. (Bus clock = 2OSCOUT ÷ 4)
OSCOUT
IAB
IDB
Internal address bus
Internal data bus
PORRST
IRST
Signal from the power-on reset module to the SIM
Internal reset signal
R/W
Read/write signal
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System Integration Module (SIM)
Addr.
Register Name
Bit 7
6
R
0
5
R
0
4
R
0
3
R
0
2
R
0
1
Bit 0
Read:
Write:
Reset:
SBSW
NOTE
0
R
0
R
0
Break Status Register
(BSR)
$FE00
Note: Writing a logic 0 clears SBSW.
Read: POR
Write:
PIN
COP
ILOP
ILAD
MODRST
LVI
0
Reset Status Register
$FE01
(RSR)
POR:
Read:
1
0
0
0
0
0
0
0
R
R
R
R
R
R
R
R
$FE02
$FE03
$FE04
$FE05
$FE06
Reserved Write:
Reset:
Read:
Break Flag Control
BCFE
R
R
R
R
R
R
R
Register Write:
(BFCR)
Reset:
0
0
Read:
IF5
R
0
IF4
R
0
IF3
R
0
0
R
0
IF1
0
R
0
0
R
Interrupt Status Register 1
(INT1)
Write:
Reset:
Read:
Write:
Reset:
Read:
Write:
Reset:
R
R
0
0
0
IF14
R
0
0
0
0
0
0
0
Interrupt Status Register 2
(INT2)
R
0
R
0
R
0
R
0
R
R
0
R
0
0
0
0
0
0
0
0
0
0
IF15
R
Interrupt Status Register 3
(INT3)
R
R
0
R
0
R
0
R
0
R
R
0
0
0
0
= Unimplemented
R
= Reserved
Figure 7-2. SIM I/O Register Summary
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System Integration Module (SIM)
SIM Bus Clock Control and Generation
7.3 SIM Bus Clock Control and Generation
The bus clock generator provides system clock signals for the CPU and
peripherals on the MCU. The system clocks are generated from an
incoming clock, OSCOUT, as shown in Figure 7-3.
From
OSCILLATOR
2OSCOUT
OSCOUT
SIM COUNTER
From
OSCILLATOR
BUS CLOCK
GENERATORS
÷ 2
SIM
Figure 7-3. SIM Clock Signals
7.3.1 Bus Timing
In user mode, the internal bus frequency is the oscillator frequency
(2OSCOUT) divided by four.
7.3.2 Clock Start-Up from POR
When the power-on reset module generates a reset, the clocks to the
CPU and peripherals are inactive and held in an inactive phase until after
the 4096 2OSCOUT cycle POR time-out has completed. The RST pin is
driven low by the SIM during this entire period. The IBUS clocks start
upon completion of the time-out.
7.3.3 Clocks in Stop Mode and Wait Mode
Upon exit from stop mode by an interrupt, break, or reset, the SIM allows
2OSCOUT to clock the SIM counter. The CPU and peripheral clocks do
not become active until after the stop delay time-out. This time-out is
selectable as 4096 or 32 2OSCOUT cycles. (See 7.7.2 Stop Mode.)
In wait mode, the CPU clocks are inactive. The SIM also produces two
sets of clocks for other modules. Refer to the wait mode subsection of
each module to see if the module is active or inactive in wait mode.
Some modules can be programmed to be active in wait mode.
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System Integration Module (SIM)
7.4 Reset and System Initialization
The MCU has these reset sources:
• Power-on reset module (POR)
• External reset pin (RST)
• Computer operating properly module (COP)
• Low-voltage inhibit module (LVI)
• Illegal opcode
• Illegal address
All of these resets produce the vector $FFFE–$FFFF ($FEFE–$FEFF in
Monitor mode) and assert the internal reset signal (IRST). IRST causes
all registers to be returned to their default values and all modules to be
returned to their reset states.
An internal reset clears the SIM counter (see 7.5 SIM Counter), but an
external reset does not. Each of the resets sets a corresponding bit in
the reset status register (RSR). (See 7.8 SIM Registers.)
7.4.1 External Pin Reset
The RST pin circuits include an internal pull-up device. Pulling the
asynchronous RST pin low halts all processing. The PIN bit of the reset
status register (RSR) is set as long as RST is held low for a minimum of
67 2OSCOUT cycles, assuming that the POR was not the source of the
reset. See Table 7-2 for details. Figure 7-4 shows the relative timing.
Table 7-2. PIN Bit Set Timing
Reset Type
POR
Number of Cycles Required to Set PIN
4163 (4096 + 64 + 3)
All others
67 (64 + 3)
2OSCOUT
RST
IAB
VECT H VECT L
PC
Figure 7-4. External Reset Timing
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System Integration Module (SIM) MOTOROLA
System Integration Module (SIM)
Reset and System Initialization
7.4.2 Active Resets from Internal Sources
All internal reset sources actively pull the RST pin low for 32 2OSCOUT
cycles to allow resetting of external peripherals. The internal reset signal
IRST continues to be asserted for an additional 32 cycles (Figure 7-5).
An internal reset can be caused by an illegal address, illegal opcode,
COP time-out, or POR. (See Figure 7-6 . Sources of Internal Reset.)
Note that for POR resets, the SIM cycles through 4096 2OSCOUT
cycles during which the SIM forces the RST pin low. The internal reset
signal then follows the sequence from the falling edge of RST shown in
Figure 7-5.
IRST
RST PULLED LOW BY MCU
32 CYCLES
RST
32 CYCLES
2OSCOUT
IAB
VECTOR HIGH
Figure 7-5. Internal Reset Timing
The COP reset is asynchronous to the bus clock.
ILLEGAL ADDRESS RST
ILLEGAL OPCODE RST
COPRST
POR
INTERNAL RESET
LVI
Figure 7-6. Sources of Internal Reset
The active reset feature allows the part to issue a reset to peripherals
and other chips within a system built around the MCU.
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System Integration Module (SIM)
7.4.2.1 Power-On Reset
When power is first applied to the MCU, the power-on reset module
(POR) generates a pulse to indicate that power-on has occurred. The
external reset pin (RST) is held low while the SIM counter counts out
4096 2OSCOUT cycles. Sixty-four 2OSCOUT cycles later, the CPU and
memories are released from reset to allow the reset vector sequence to
occur.
At power-on, the following events occur:
• A POR pulse is generated.
• The internal reset signal is asserted.
• The SIM enables the oscillator to drive 2OSCOUT.
• Internal clocks to the CPU and modules are held inactive for 4096
2OSCOUT cycles to allow stabilization of the oscillator.
• The RST pin is driven low during the oscillator stabilization time.
• The POR bit of the reset status register (RSR) is set and all other
bits in the register are cleared.
OSC1
PORRST
4096
CYCLES
32
CYCLES
32
CYCLES
2OSCOUT
OSCOUT
RST
IAB
$FFFE
$FFFF
Figure 7-7. POR Recovery
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System Integration Module (SIM)
Reset and System Initialization
7.4.2.2 Computer Operating Properly (COP) Reset
An input to the SIM is reserved for the COP reset signal. The overflow of
the COP counter causes an internal reset and sets the COP bit in the
reset status register (RSR). The SIM actively pulls down the RST pin for
all internal reset sources.
To prevent a COP module time-out, write any value to location $FFFF.
Writing to location $FFFF clears the COP counter and stages 12 through
5 of the SIM counter. The SIM counter output, which occurs at least
every (212 – 24) 2OSCOUT cycles, drives the COP counter. The COP
should be serviced as soon as possible out of reset to guarantee the
maximum amount of time before the first time-out.
The COP module is disabled if the RST pin or the IRQ1 pin is held at
V
DD + VHI while the MCU is in monitor mode. The COP module can be
disabled only through combinational logic conditioned with the high
voltage signal on the RST or the IRQ1 pin. This prevents the COP from
becoming disabled as a result of external noise. During a break state,
V
DD + VHI on the RST pin disables the COP module.
7.4.2.3 Illegal Opcode Reset
The SIM decodes signals from the CPU to detect illegal instructions. An
illegal instruction sets the ILOP bit in the reset status register (RSR) and
causes a reset.
If the stop enable bit, STOP, in the mask option register is logic zero, the
SIM treats the STOP instruction as an illegal opcode and causes an
illegal opcode reset. The SIM actively pulls down the RST pin for all
internal reset sources.
7.4.2.4 Illegal Address Reset
An opcode fetch from an unmapped address generates an illegal
address reset. The SIM verifies that the CPU is fetching an opcode prior
to asserting the ILAD bit in the reset status register (RSR) and resetting
the MCU. A data fetch from an unmapped address does not generate a
reset. The SIM actively pulls down the RST pin for all internal reset
sources.
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System Integration Module (SIM)
7.4.2.5 LVI Reset
The low-voltage inhibit module (LVI) asserts its output to the SIM when
the VDD voltage falls to the LVI trip voltage VTRIP. The LVI bit in the SIM
reset status register (SRSR) is set, and the external reset pin (RSTB) is
held low while the SIM counter counts out 4096 2OSCOUT cycles. Sixty-
four 2OSCOUT cycles later, the CPU and memories are released from
reset to allow the reset vector sequence to occur. The SIM actively pulls
down the (RSTB) pin for all internal reset sources.
7.5 SIM Counter
The SIM counter is used by the power-on reset module (POR) and in
stop mode recovery to allow the oscillator time to stabilize before
enabling the internal bus (IBUS) clocks. The SIM counter also serves as
a prescaler for the computer operating properly module (COP). The SIM
counter uses 12 stages for counting, followed by a 13th stage that
triggers a reset of SIM counters and supplies the clock for the COP
module. The SIM counter is clocked by the falling edge of 2OSCOUT.
7.5.1 SIM Counter During Power-On Reset
The power-on reset module (POR) detects power applied to the MCU.
At power-on, the POR circuit asserts the signal PORRST. Once the SIM
is initialized, it enables the oscillator to drive the bus clock state machine.
7.5.2 SIM Counter During Stop Mode Recovery
The SIM counter also is used for stop mode recovery. The STOP
instruction clears the SIM counter. After an interrupt, break, or reset, the
SIM senses the state of the short stop recovery bit, SSREC, in the mask
option register. If the SSREC bit is a logic one, then the stop recovery is
reduced from the normal delay of 4096 2OSCOUT cycles down to 32
2OSCOUT cycles. This is ideal for applications using canned oscillators
that do not require long start-up times from stop mode. External crystal
applications should use the full stop recovery time, that is, with SSREC
cleared in the configuration register (CONFIG).
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MOTOROLA
System Integration Module (SIM)
Exception Control
7.5.3 SIM Counter and Reset States
External reset has no effect on the SIM counter. (See 7.7.2 Stop Mode
for details.) The SIM counter is free-running after all reset states. (See
7.4.2 Active Resets from Internal Sources for counter control and
internal reset recovery sequences.)
7.6 Exception Control
Normal, sequential program execution can be changed in three different
ways:
• Interrupts
– Maskable hardware CPU interrupts
– Non-maskable software interrupt instruction (SWI)
• Reset
• Break interrupts
7.6.1 Interrupts
An interrupt temporarily changes the sequence of program execution to
respond to a particular event. Figure 7-8 flow charts the handling of
system interrupts.
Interrupts are latched, and arbitration is performed in the SIM at the start
of interrupt processing. The arbitration result is a constant that the CPU
uses to determine which vector to fetch. Once an interrupt is latched by
the SIM, no other interrupt can take precedence, regardless of priority,
until the latched interrupt is serviced (or the I bit is cleared).
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System Integration Module (SIM)
FROM RESET
YES
BREAK INTERRUPT?
NO
YES
I BIT SET?
NO
YES
YES
IRQ
INTERRUPT?
NO
TIMER
INTERRUPT?
NO
STACK CPU REGISTERS.
SET I BIT.
LOAD PC WITH INTERRUPT VECTOR.
(As many interrupts as exist on chip)
FETCH NEXT
INSTRUCTION
SWI
INSTRUCTION?
YES
YES
NO
RTI
INSTRUCTION?
UNSTACK CPU REGISTERS.
EXECUTE INSTRUCTION.
NO
Figure 7-8. Interrupt Processing
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System Integration Module (SIM)
Exception Control
At the beginning of an interrupt, the CPU saves the CPU register
contents on the stack and sets the interrupt mask (I bit) to prevent
additional interrupts. At the end of an interrupt, the RTI instruction
recovers the CPU register contents from the stack so that normal
processing can resume. Figure 7-9 shows interrupt entry timing.
Figure 7-10 shows interrupt recovery timing.
MODULE
INTERRUPT
I BIT
IAB
DUMMY
SP
SP – 1
SP – 2
SP – 3
SP – 4
VECT H
VECT L START ADDR
IDB
R/W
DUMMY PC – 1[7:0] PC – 1[15:8]
X
A
CCR
V DATA H V DATA L OPCODE
Figure 7-9. Interrupt Entry
MODULE
INTERRUPT
I BIT
IAB
SP – 4
SP – 3
SP – 2
SP – 1
SP
PC
PC + 1
IDB
R/W
CCR
A
X
PC – 1[15:8] PC – 1[7:0] OPCODE OPERAND
Figure 7-10. Interrupt Recovery
7.6.1.1 Hardware Interrupts
A hardware interrupt does not stop the current instruction. Processing of
a hardware interrupt begins after completion of the current instruction.
When the current instruction is complete, the SIM checks all pending
hardware interrupts. If interrupts are not masked (I bit clear in the
condition code register), and if the corresponding interrupt enable bit is
set, the SIM proceeds with interrupt processing; otherwise, the next
instruction is fetched and executed.
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System Integration Module (SIM)
If more than one interrupt is pending at the end of an instruction
execution, the highest priority interrupt is serviced first. Figure 7-11
demonstrates what happens when two interrupts are pending. If an
interrupt is pending upon exit from the original interrupt service routine,
the pending interrupt is serviced before the LDA instruction is executed.
CLI
LDA #$FF
BACKGROUND ROUTINE
INT1
PSHH
INT1 INTERRUPT SERVICE ROUTINE
PULH
RTI
INT2
PSHH
INT2 INTERRUPT SERVICE ROUTINE
PULH
RTI
Figure 7-11. Interrupt Recognition Example
The LDA opcode is prefetched by both the INT1 and INT2 RTI
instructions. However, in the case of the INT1 RTI prefetch, this is a
redundant operation.
NOTE: To maintain compatibility with the M6805 Family, the H register is not
pushed on the stack during interrupt entry. If the interrupt service routine
modifies the H register or uses the indexed addressing mode, software
should save the H register and then restore it prior to exiting the routine.
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System Integration Module (SIM)
MOTOROLA
System Integration Module (SIM)
Exception Control
7.6.1.2 SWI Instruction
The SWI instruction is a non-maskable instruction that causes an
interrupt regardless of the state of the interrupt mask (I bit) in the
condition code register.
NOTE: A software interrupt pushes PC onto the stack. A software interrupt does
not push PC – 1, as a hardware interrupt does.
7.6.2 Interrupt Status Registers
The flags in the interrupt status registers identify maskable interrupt
sources. Table 7-3 summarizes the interrupt sources and the interrupt
status register flags that they set. The interrupt status registers can be
useful for debugging.
Table 7-3. Interrupt Sources
INT
Register
Flag
Mask1(1)
Source
Flag
Vector Address
Priority
Highest
Reset
—
—
—
—
$FFFE–$FFFF
$FFFC–$FFFD
$FFFA–$FFFB
$FFF6–$FFF7
$FFF4–$FFF5
$FFF2–$FFF3
$FFE0–$FFE1
$FFDE–$FFDF
SWI Instruction
IRQ1 Pin
—
—
IRQF1
CH0F
CH1F
TOF
IMASK1
CH0IE
CH1IE
TOIE
IF1
IF3
IF4
IF5
IF14
IF15
Timer Channel 0 Interrupt
Timer Channel 1 Interrupt
Timer Overflow Interrupt
Keyboard Interrupt
KEYF
COCO
IMASKK
AIEN
Lowest
ADC Conversion Complete Interrupt
Notes:
1. The I bit in the condition code register is a global mask for all interrupts sources except the SWI instruction.
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MOTOROLA System Integration Module (SIM)
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System Integration Module (SIM)
7.6.2.1 Interrupt Status Register 1
Address: $FE04
Bit 7
6
5
IF4
R
4
IF3
R
3
0
2
IF1
R
1
0
Bit 0
0
Read:
Write:
Reset:
0
R
0
IF5
R
R
0
R
0
R
0
0
0
0
0
R
= Reserved
Figure 7-12. Interrupt Status Register 1 (INT1)
IF1, IF3 to IF5 — Interrupt Flags
These flags indicate the presence of interrupt requests from the
sources shown in Table 7-3.
1 = Interrupt request present
0 = No interrupt request present
Bit 0, 1, 3 and 7 — Always read 0
7.6.2.2 Interrupt Status Register 2
Address: $FE05
Bit 7
6
5
0
4
0
3
0
2
0
1
0
Bit 0
0
Read:
Write:
Reset:
IF14
R
0
R
R
0
R
0
R
0
R
0
R
0
R
0
0
0
R
= Reserved
Figure 7-13. Interrupt Status Register 2 (INT2)
IF14 — Interrupt Flags
This flag indicates the presence of interrupt requests from the sources
shown in Table 7-3.
1 = Interrupt request present
0 = No interrupt request present
Bit 0 to 6 — Always read 0
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MOTOROLA
System Integration Module (SIM)
Exception Control
7.6.2.3 Interrupt Status Register 3
Address: $FE06
Bit 7
6
5
0
4
0
3
0
2
0
1
0
Bit 0
IF15
R
Read:
Write:
Reset:
0
R
0
0
R
R
0
R
0
R
0
R
0
R
0
0
0
R
= Reserved
Figure 7-14. Interrupt Status Register 3 (INT3)
IF15 — Interrupt Flags
These flags indicate the presence of interrupt requests from the
sources shown in Table 7-3.
1 = Interrupt request present
0 = No interrupt request present
Bit 1 to 7 — Always read 0
7.6.3 Reset
All reset sources always have equal and highest priority and cannot be
arbitrated.
7.6.4 Break Interrupts
The break module can stop normal program flow at a software-
programmable break point by asserting its break interrupt output. (See
Section 17. Break Module (BREAK).) The SIM puts the CPU into the
break state by forcing it to the SWI vector location. Refer to the break
interrupt subsection of each module to see how each module is affected
by the break state.
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System Integration Module (SIM)
7.6.5 Status Flag Protection in Break Mode
The SIM controls whether status flags contained in other modules can
be cleared during break mode. The user can select whether flags are
protected from being cleared by properly initializing the break clear flag
enable bit (BCFE) in the break flag control register (BFCR).
Protecting flags in break mode ensures that set flags will not be cleared
while in break mode. This protection allows registers to be freely read
and written during break mode without losing status flag information.
Setting the BCFE bit enables the clearing mechanisms. Once cleared in
break mode, a flag remains cleared even when break mode is exited.
Status flags with a two-step clearing mechanism — for example, a read
of one register followed by the read or write of another — are protected,
even when the first step is accomplished prior to entering break mode.
Upon leaving break mode, execution of the second step will clear the flag
as normal.
7.7 Low-Power Modes
Executing the WAIT or STOP instruction puts the MCU in a low-power-
consumption mode for standby situations. The SIM holds the CPU in a
non-clocked state. The operation of each of these modes is described
below. Both STOP and WAIT clear the interrupt mask (I) in the condition
code register, allowing interrupts to occur.
7.7.1 Wait Mode
In wait mode, the CPU clocks are inactive while the peripheral clocks
continue to run. Figure 7-15 shows the timing for wait mode entry.
A module that is active during wait mode can wake up the CPU with an
interrupt if the interrupt is enabled. Stacking for the interrupt begins one
cycle after the WAIT instruction during which the interrupt occurred. In
wait mode, the CPU clocks are inactive. Refer to the wait mode
subsection of each module to see if the module is active or inactive in
wait mode. Some modules can be programmed to be active in wait
mode.
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MOTOROLA
System Integration Module (SIM)
Low-Power Modes
Wait mode can also be exited by a reset or break. A break interrupt
during wait mode sets the SIM break stop/wait bit, SBSW, in the break
status register (BSR). If the COP disable bit, COPD, in the mask option
register is logic zero, then the computer operating properly module
(COP) is enabled and remains active in wait mode.
IAB
IDB
R/W
WAIT ADDR
WAIT ADDR + 1
SAME
SAME
PREVIOUS DATA
NEXT OPCODE
SAME
SAME
NOTE: Previous data can be operand data or the WAIT opcode, depending on the
last instruction.
Figure 7-15. Wait Mode Entry Timing
Figure 7-16 and Figure 7-17 show the timing for WAIT recovery.
IAB
$6E0B
$A6
$6E0C
$00FF
$00FE
$00FD
$00FC
IDB $A6
$A6
$01
$0B
$6E
EXITSTOPWAIT
NOTE: EXITSTOPWAIT = RST pin OR CPU interrupt OR break interrupt
Figure 7-16. Wait Recovery from Interrupt or Break
32
Cycles
32
Cycles
IAB
IDB
RST
$6E0B
$A6
RSTVCTH RSTVCTL
$A6
$A6
2OSCOUT
Figure 7-17. Wait Recovery from Internal Reset
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA System Integration Module (SIM)
Technical Data
95
System Integration Module (SIM)
7.7.2 Stop Mode
In stop mode, the SIM counter is reset and the system clocks are
disabled. An interrupt request from a module can cause an exit from stop
mode. Stacking for interrupts begins after the selected stop recovery
time has elapsed. Reset or break also causes an exit from stop mode.
The SIM disables the oscillator signals (OSCOUT and 2OSCOUT) in
stop mode, stopping the CPU and peripherals. Stop recovery time is
selectable using the SSREC bit in the configuration register (CONFIG).
If SSREC is set, stop recovery is reduced from the normal delay of 4096
2OSCOUT cycles down to 32. This is ideal for applications using canned
oscillators that do not require long start-up times from stop mode.
NOTE: External crystal applications should use the full stop recovery time by
clearing the SSREC bit.
A break interrupt during stop mode sets the SIM break stop/wait bit
(SBSW) in the break status register (BSR).
The SIM counter is held in reset from the execution of the STOP
instruction until the beginning of stop recovery. It is then used to time the
recovery period. Figure 7-18 shows stop mode entry timing.
NOTE: To minimize stop current, all pins configured as inputs should be driven
to a logic 1 or logic 0.
CPUSTOP
IAB
IDB
R/W
STOP ADDR
STOP ADDR + 1
SAME
SAME
PREVIOUS DATA
NEXT OPCODE
SAME
SAME
NOTE: Previous data can be operand data or the STOP opcode, depending on the last
instruction.
Figure 7-18. Stop Mode Entry Timing
Technical Data
96
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
System Integration Module (SIM)
MOTOROLA
System Integration Module (SIM)
SIM Registers
STOP RECOVERY PERIOD
2OSCOUT
INT/BREAK
IAB
STOP +1
STOP + 2
STOP + 2
SP
SP – 1
SP – 2
SP – 3
Figure 7-19. Stop Mode Recovery from Interrupt or Break
7.8 SIM Registers
The SIM has three memory mapped registers. Table 7-4 shows the
mapping of these registers.
Table 7-4. SIM Registers
Address
$FE00
$FE01
$FE03
Register
BSR
Access Mode
User
RSR
User
BFCR
User
7.8.1 Break Status Register (BSR)
The break status register contains a flag to indicate that a break caused
an exit from stop or wait mode.
Address: $FE00
Bit 7
R
6
5
4
3
2
1
Bit 0
R
Read:
Write:
Reset:
SBSW
Note(1)
0
R
R
R
R
R
R
= Reserved
1. Writing a logic zero clears SBSW.
Figure 7-20. Break Status Register (BSR)
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA System Integration Module (SIM)
Technical Data
97
System Integration Module (SIM)
SBSW — SIM Break Stop/Wait
This status bit is useful in applications requiring a return to wait or stop
mode after exiting from a break interrupt. Clear SBSW by writing a
logic zero to it. Reset clears SBSW.
1 = Stop mode or wait mode was exited by break interrupt
0 = Stop mode or wait mode was not exited by break interrupt
SBSW can be read within the break state SWI routine. The user can
modify the return address on the stack by subtracting one from it. The
following code is an example of this. Writing zero to the SBSW bit clears
it.
; This code works if the H register has been pushed onto the stack in the break
; service routine software. This code should be executed at the end of the
; break service routine software.
HIBYTE EQU
LOBYTE EQU
5
6
;
If not SBSW, do RTI
BRCLR SBSW,BSR, RETURN ; See if wait mode or stop mode was exited
; by break.
TST
BNE
DEC
DEC
LOBYTE,SP
DOLO
; If RETURNLO is not zero,
; then just decrement low byte.
; Else deal with high byte, too.
; Point to WAIT/STOP opcode.
; Restore H register.
HIBYTE,SP
LOBYTE,SP
DOLO
RETURN PULH
RTI
7.8.2 Reset Status Register (RSR)
This register contains six flags that show the source of the last reset.
Clear the SIM reset status register by reading it. A power-on reset sets
the POR bit and clears all other bits in the register.
Technical Data
98
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
System Integration Module (SIM)
MOTOROLA
System Integration Module (SIM)
SIM Registers
Address: $FE01
Bit 7
6
5
4
3
2
1
Bit 0
0
Read:
Write:
POR:
POR
PIN
COP
ILOP
ILAD
MODRST
LVI
1
0
0
0
0
0
0
0
= Unimplemented
Figure 7-21. Reset Status Register (RSR)
POR — Power-On Reset Bit
1 = Last reset caused by POR circuit
0 = Read of SRSR
PIN — External Reset Bit
1 = Last reset caused by external reset pin (RST)
0 = POR or read of SRSR
COP — Computer Operating Properly Reset Bit
1 = Last reset caused by COP counter
0 = POR or read of SRSR
ILOP — Illegal Opcode Reset Bit
1 = Last reset caused by an illegal opcode
0 = POR or read of SRSR
ILAD — Illegal Address Reset Bit (opcode fetches only)
1 = Last reset caused by an opcode fetch from an illegal address
0 = POR or read of SRSR
MODRST — Monitor Mode Entry Module Reset bit
1 = Last reset caused by monitor mode entry when vector locations
$FFFE and $FFFF are $FF after POR while IRQ1 = VDD
0 = POR or read of SRSR
LVI — Low Voltage Inhibit Reset bit
1 = Last reset caused by LVI circuit
0 = POR or read of SRSR
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA System Integration Module (SIM)
Technical Data
99
System Integration Module (SIM)
7.8.3 Break Flag Control Register (BFCR)
The break control register contains a bit that enables software to clear
status bits while the MCU is in a break state.
Address: $FE03
Bit 7
6
5
4
3
2
1
Bit 0
R
Read:
Write:
Reset:
BCFE
R
R
R
R
R
R
0
R
= Reserved
Figure 7-22. Break Flag Control Register (BFCR)
BCFE — Break Clear Flag Enable Bit
This read/write bit enables software to clear status bits by accessing
status registers while the MCU is in a break state. To clear status bits
during the break state, the BCFE bit must be set.
1 = Status bits clearable during break
0 = Status bits not clearable during break
Technical Data
100
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
System Integration Module (SIM)
MOTOROLA
Technical Data – MC68H(R)C908JL3E/JK3E/JK1E
Section 8. Oscillator (OSC)
8.1 Contents
8.2
8.3
8.4
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .101
X-tal Oscillator (MC68HC908JL3E/JK3E/JK1E). . . . . . . . . . .102
RC Oscillator (MC68HRC908JL3E/JK3E/JK1E) . . . . . . . . . .103
8.5
I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .104
Crystal Amplifier Input Pin (OSC1). . . . . . . . . . . . . . . . . . .104
Crystal Amplifier Output Pin (OSC2/PTA6/RCCLK). . . . . .104
Oscillator Enable Signal (SIMOSCEN). . . . . . . . . . . . . . . .104
X-tal Oscillator Clock (XTALCLK). . . . . . . . . . . . . . . . . . . .104
RC Oscillator Clock (RCCLK). . . . . . . . . . . . . . . . . . . . . . .105
Oscillator Out 2 (2OSCOUT) . . . . . . . . . . . . . . . . . . . . . . .105
Oscillator Out (OSCOUT). . . . . . . . . . . . . . . . . . . . . . . . . .105
8.5.1
8.5.2
8.5.3
8.5.4
8.5.5
8.5.6
8.5.7
8.6
8.6.1
8.6.2
Low Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105
Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105
8.7
Oscillator During Break Mode. . . . . . . . . . . . . . . . . . . . . . . . .106
8.2 Introduction
The oscillator module provides the reference clock for the MCU system
and bus. Two types of oscillator modules are available:
• MC68HC908JL3E/JK3E/JK1E — built-in oscillator module (X-tal)
that requires an external crystal or ceramic-resonator. This option
also allows an external clock that can be driven directly into OSC1.
• MC68HRC908JL3E/JK3E/JK1E — built-in oscillator module (RC)
that requires an external RC connection only.
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
101
Oscillator (OSC)
Oscillator (OSC)
8.3 X-tal Oscillator (MC68HC908JL3E/JK3E/JK1E)
The X-tal oscillator circuit is designed for use with an external crystal or
ceramic resonator to provide accurate clock source.
In its typical configuration, the X-tal oscillator is connected in a Pierce
oscillator configuration, as shown in Figure 8-1. This figure shows only
the logical representation of the internal components and may not
represent actual circuitry. The oscillator configuration uses five
components:
• Crystal, X1
• Fixed capacitor, C1
• Tuning capacitor, C2 (can also be a fixed capacitor)
• Feedback resistor, RB
• Series resistor, RS (optional)
From SIM
To SIM
2OSCOUT
To SIM
OSCOUT
XTALCLK
÷ 2
SIMOSCEN
MCU
OSC1
OSC2
R
B
RS*
*RS can be zero (shorted) when used with higher-frequency crystals.
Refer to manufacturer’s data.
X
1
See Section 18. for component value requirements.
C
C
2
1
Figure 8-1. X-tal Oscillator External Connections
Technical Data
102
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Oscillator (OSC)
Oscillator (OSC)
RC Oscillator (MC68HRC908JL3E/JK3E/JK1E)
The series resistor (RS) is included in the diagram to follow strict Pierce
oscillator guidelines and may not be required for all ranges of operation,
especially with high frequency crystals. Refer to the crystal
manufacturer’s data for more information.
8.4 RC Oscillator (MC68HRC908JL3E/JK3E/JK1E)
The RC oscillator circuit is designed for use with external R and C to
provide a clock source with tolerance less than 10%.
In its typical configuration, the RC oscillator requires two external
components, one R and one C. Component values should have a
tolerance of 1% or less, to obtain a clock source with less than 10%
tolerance. The oscillator configuration uses two components:
• CEXT
• REXT
From SIM
To SIM
2OSCOUT
To SIM
OSCOUT
SIMOSCEN
Ext-RC
RCCLK
EN
÷ 2
Oscillator
0
1
PTA6
I/O
PTA6
PTA6EN
MCU
OSC1
PTA6/RCCLK (OSC2)
V
DD
See Section 18. for component value requirements.
R
C
EXT
EXT
Figure 8-2. RC Oscillator External Connections
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
103
Oscillator (OSC)
Oscillator (OSC)
8.5 I/O Signals
The following paragraphs describe the oscillator I/O signals.
8.5.1 Crystal Amplifier Input Pin (OSC1)
OSC1 pin is an input to the crystal oscillator amplifier or the input to the
RC oscillator circuit.
8.5.2 Crystal Amplifier Output Pin (OSC2/PTA6/RCCLK)
For the X-tal oscillator device, OSC2 pin is the output of the crystal
oscillator inverting amplifier.
For the RC oscillator device, OSC2 pin can be configured as a general
purpose I/O pin PTA6, or the output of the internal RC oscillator clock,
RCCLK.
Device
Oscillator
OSC2 pin function
MC68HC908JL3E/JK3E/JK1E
X-tal
Inverting OSC1
Controlled by PTA6EN bit in PTAPUER ($0D)
PTA6EN = 0: RCCLK output
MC68HRC908JL3E/JK3E/JK1E
RC
PTA6EN = 1: PTA6 I/O
8.5.3 Oscillator Enable Signal (SIMOSCEN)
The SIMOSCEN signal comes from the system integration module (SIM)
and enables/disables the X-tal oscillator circuit or the RC-oscillator.
8.5.4 X-tal Oscillator Clock (XTALCLK)
XTALCLK is the X-tal oscillator output signal. It runs at the full speed of
the crystal (fXCLK) and comes directly from the crystal oscillator circuit.
Figure 8-1 shows only the logical relation of XTALCLK to OSC1 and
OSC2 and may not represent the actual circuitry. The duty cycle of
XTALCLK is unknown and may depend on the crystal and other external
factors. Also, the frequency and amplitude of XTALCLK can be unstable
at start-up.
Technical Data
104
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
Oscillator (OSC)
MOTOROLA
Oscillator (OSC)
Low Power Modes
8.5.5 RC Oscillator Clock (RCCLK)
RCCLK is the RC oscillator output signal. Its frequency is directly
proportional to the time constant of the external R and C. Figure 8-2
shows only the logical relation of RCCLK to OSC1 and may not
represent the actual circuitry.
8.5.6 Oscillator Out 2 (2OSCOUT)
2OSCOUT is same as the input clock (XTALCLK or RCCLK). This signal
is driven to the SIM module and is used to determine the COP cycles.
8.5.7 Oscillator Out (OSCOUT)
The frequency of this signal is equal to half of the 2OSCOUT, this signal
is driven to the SIM for generation of the bus clocks used by the CPU
and other modules on the MCU. OSCOUT will be divided again in the
SIM and results in the internal bus frequency being one fourth of the
XTALCLK or RCCLK frequency.
8.6 Low Power Modes
The WAIT and STOP instructions put the MCU in low-power
consumption standby modes.
8.6.1 Wait Mode
8.6.2 Stop Mode
The WAIT instruction has no effect on the oscillator logic. OSCOUT and
2OSCOUT continues to drive to the SIM module.
The STOP instruction disables the XTALCLK or the RCCLK output,
hence OSCOUT and 2OSCOUT.
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
105
Oscillator (OSC)
Oscillator (OSC)
8.7 Oscillator During Break Mode
The oscillator continues to drive OSCOUT and 2OSCOUT when the
device enters the break state.
Technical Data
106
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Oscillator (OSC)
Technical Data – MC68H(R)C908JL3E/JK3E/JK1E
Section 9. Monitor ROM (MON)
9.1 Contents
9.2
9.3
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .107
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .108
9.4
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .108
Entering Monitor Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . .110
Baud Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .113
Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .114
Echoing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .114
Break Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .115
Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .115
9.4.1
9.4.2
9.4.3
9.4.4
9.4.5
9.4.6
9.5
Security. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .119
9.2 Introduction
This section describes the monitor ROM (MON) and the monitor mode
entry methods. The monitor ROM allows complete testing of the MCU
through a single-wire interface with a host computer. This mode is also
used for programming and erasing of FLASH memory in the MCU.
Monitor mode entry can be achieved without use of the higher test
voltage, VDD + VHI, as long as vector addresses $FFFE and $FFFF are
blank, thus reducing the hardware requirements for in-circuit
programming.
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
107
Monitor ROM (MON)
Monitor ROM (MON)
9.3 Features
Features of the monitor ROM include the following:
• Normal user-mode pin functionality
• One pin dedicated to serial communication between monitor ROM
and host computer
• Standard mark/space non-return-to-zero (NRZ) communication
with host computer
• Execution of code in RAM or FLASH
• FLASH memory security feature1
• FLASH memory programming interface
• 960 bytes monitor ROM code size
• Monitor mode entry without high voltage, VDD + VHI, if reset vector
is blank ($FFFE and $FFFF contain $FF)
• Standard monitor mode entry if high voltage, VDD + VHI, is applied
to IRQ1
9.4 Functional Description
The monitor ROM receives and executes commands from a host
computer. Figure 9-1 shows a example circuit used to enter monitor
mode and communicate with a host computer via a standard RS-232
interface.
Simple monitor commands can access any memory address. In monitor
mode, the MCU can execute host-computer code in RAM while most
MCU pins retain normal operating mode functions. All communication
between the host computer and the MCU is through the PTB0 pin. A
level-shifting and multiplexing interface is required between PTB0 and
the host computer. PTB0 is used in a wired-OR configuration and
requires a pull-up resistor.
1. No security feature is absolutely secure. However, Motorola’s strategy is to make reading or
copying the FLASH difficult for unauthorized users.
Technical Data
108
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
Monitor ROM (MON)
MOTOROLA
Monitor ROM (MON)
Functional Description
RST
RC CIRCUIT
V
DD
0.1 µF
FOR MC68HRC908JL3E/JK3E/JK1E
SW1 MUST BE AT POSITION B
See Figure 18-1 for component
values vs. frequency.
H(R)C908JL3E
H(R)C908JK3E
H(R)C908JK1E
OSC1
V
DD
OSC2
V
DD
0.1 µF
V
SS
EXT OSC
V
DD
FOR MC68HC908JL3E/JK3E/JK1E
SW1 AT POSITION A OR B
(50% DUTY)
OSC1
OSC2
FOR MC68HRC908JL3E/JK3E/JK1E
SW1 MUST BE AT POSITION A
XTAL CIRCUIT
9.8304MHz
OSC1
OSC2
FOR MC68HC908JL3E/JK3E/JK1E
SW1 AT POSITION A OR B 20 pF
MAX232
V
DD
20 pF
1
16
15
V
C1+
CC
+
+
+
1 µF
1 µF
1 µF
3
4
1 µF
C1–
C2+
GND
+
V
+ V
HI
A
B
2
6
DD
SW1
10 k
V+
V–
(SEE NOTE 1)
V
1 k
DD
IRQ
8.5 V
V
DD
5
C2–
1 µF
10 k
+
74HC125
6
DB9
5
10
9
2
3
7
8
PTB0
74HC125
3
4
V
2
DD
V
DD
1
5
10 k
10 k
PTB1
PTB3
PTB2
SW2
C
D
(SEE NOTE 2)
NOTES:
1. Monitor mode entry method:
SW1: Position A — High voltage entry (V
)
TST
10 k
10 k
Clock source must be EXT OSC or XTAL CIRCUIT.
Bus clock depends on SW2.
SW1: Position B — Reset vector must be blank ($FFFE = $FFFF = $FF)
Bus clock = OSC1 ÷ 4.
2. Affects high voltage entry to monitor mode only (SW1 at position A):
SW2: Position C — Bus clock = OSC1 ÷ 4
SW2: Position D — Bus clock = OSC1 ÷ 2
5. See Table 18-4 for V + V voltage level requirements.
DD
HI
Figure 9-1. Monitor Mode Circuit
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
109
Monitor ROM (MON)
Monitor ROM (MON)
9.4.1 Entering Monitor Mode
Table 9-1 shows the pin conditions for entering monitor mode. As
specified in the table, monitor mode may be entered after a POR and will
allow communication at 9600 baud provided one of the following sets of
conditions is met:
1. If IRQ1 = VDD + VHI:
– Clock on OSC1 is 4.9125MHz (EXT OSC or XTAL)
– PTB3 = low
2. If IRQ1 = VDD + VHI:
– Clock on OSC1 is 9.8304MHz (EXT OSC or XTAL)
– PTB3 = high
3. If $FFFE & $FFFF is blank (contains $FF):
– Clock on OSC1 is 9.8304MHz (EXT OSC or XTAL or RC)
– IRQ1 = VDD
Table 9-1. Monitor Mode Entry Requirements and Options
Bus
Frequency
OSC1 Frequency
Comments
2.4576MHz
(OSC1 ÷ 2)
(2)
High-voltage entry to
monitor mode.(3)
9600 baud communication
on PTB0. COP disabled.
VDD + VHI
X
X
0
1
0
0
1
1
1
1
4.9152MHz
9.8304MHz
2.4576MHz
(OSC1 ÷ 4)
VDD + VHI
Low-voltage entry to
monitor mode.(4)
9600 baud communication
on PTB0. COP disabled.
BLANK
(contain
$FF)
2.4576MHz
(OSC1 ÷ 4)
VDD
X
X
X
X
X
X
1
9.8304MHz
NOT
BLANK
At desired
frequency
VDD
X
OSC1 ÷ 4
Enters User mode.
Notes:
1. PTB3 = 0: Bypasses the divide-by-two prescaler to SIM when using VDD + VHI for monitor mode entry.
The OSC1 clock must be 50% duty cycle for this condition.
2. See Table 18-4 for VDD + VHI voltage level requirements.
3. For IRQ1 = VDD + VHI:
MC68HRC908JL3E/JK3E/JK1E — clock must be EXT OSC.
MC68HC908JL3E/JK3E/JK1E — clock can be EXT OSC or XTAL.
4. For IRQ1 = VDD
:
MC68HRC908JL3E/JK3E/JK1E — clock must be RC OSC.
MC68HC908JL3E/JK3E/JK1E — clock can be EXT OSC or XTAL.
Technical Data
110
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Monitor ROM (MON)
Monitor ROM (MON)
Functional Description
If VDD +VHI is applied to IRQ1 and PTB3 is low upon monitor mode entry
(Table 9-1 condition set 1), the bus frequency is a divide-by-two of the
clock input to OSC1. If PTB3 is high with VDD +VHI applied to IRQ1 upon
monitor mode entry (Table 9-1 condition set 2), the bus frequency is a
divide-by-four of the clock input to OSC1. Holding the PTB3 pin low
when entering monitor mode causes a bypass of a divide-by-two stage
at the oscillator only if VDD +VHI is applied to IRQ1. In this event, the
OSCOUT frequency is equal to the 2OSCOUT frequency, and OSC1
input directly generates internal bus clocks. In this case, the OSC1
signal must have a 50% duty cycle at maximum bus frequency.
Entering monitor mode with VDD + VHI on IRQ1, the COP is disabled as
long as VDD + VHI is applied to either the IRQ1 or the RST. (See Section
7. System Integration Module (SIM) for more information on modes of
operation.)
If entering monitor mode without high voltage on IRQ1 and reset vector
being blank ($FFFE and $FFFF) (Table 9-1 condition set 3, where
applied voltage is VDD), then all port B pin requirements and conditions,
including the PTB3 frequency divisor selection, are not in effect. This is
to reduce circuit requirements when performing in-circuit programming.
Entering monitor mode with the reset vector being blank, the COP is
always disabled regardless of the state of IRQ1 or the RST.
Figure 9-2. shows a simplified diagram of the monitor mode entry when
the reset vector is blank and IRQ1 = VDD. An OSC1 frequency of
9.8304MHz is required for a baud rate of 9600.
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
111
Monitor ROM (MON)
Monitor ROM (MON)
POR RESET
NO
IS VECTOR
BLANK?
NORMAL USER
MODE
YES
MONITOR MODE
EXECUTE
MONITOR
CODE
NO
POR
TRIGGERED?
YES
Figure 9-2. Low-Voltage Monitor Mode Entry Flowchart
Enter monitor mode with the pin configuration shown above by pulling
RST low and then high. The rising edge of RST latches monitor mode.
Once monitor mode is latched, the values on the specified pins can
change.
Once out of reset, the MCU waits for the host to send eight security
bytes. (See 9.5 Security.) After the security bytes, the MCU sends a
break signal (10 consecutive logic zeros) to the host, indicating that it is
ready to receive a command. The break signal also provides a timing
reference to allow the host to determine the necessary baud rate.
In monitor mode, the MCU uses different vectors for reset, SWI, and
break interrupt. The alternate vectors are in the $FE page instead of the
$FF page and allow code execution from the internal monitor firmware
instead of user code.
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MOTOROLA
Monitor ROM (MON)
Functional Description
Table 9-2 is a summary of the vector differences between user mode
and monitor mode.
Table 9-2. Monitor Mode Vector Differences
Functions
Reset
Vector Vector Vector Vector Vector Vector
High Low High Low High Low
Reset
Break
Break
SWI
SWI
Modes
COP
User
Enabled
$FFFE $FFFF $FFFC $FFFD $FFFC $FFFD
Monitor Disabled(1) $FEFE $FEFF $FEFC $FEFD $FEFC $FEFD
Notes:
1. If the high voltage (VDD + VHI) is removed from the IRQ1 pin or the RST pin, the SIM
asserts its COP enable output. The COP is a mask option enabled or disabled by the
COPD bit in the configuration register.
When the host computer has completed downloading code into the MCU
RAM, the host then sends a RUN command, which executes an RTI,
which sends control to the address on the stack pointer.
9.4.2 Baud Rate
The communication baud rate is dependant on oscillator frequency. The
state of PTB3 also affects baud rate if entry to monitor mode is by IRQ1 =
VDD + VHI. When PTB3 is high, the divide by ratio is 1024. If the PTB3
pin is at logic zero upon entry into monitor mode, the divide by ratio is
512.
Table 9-3. Monitor Baud Rate Selection
Monitor Mode
Entry By:
Input Clock
Frequency
PTB3
Baud Rate
4.9152 MHz
9.8304 MHz
4.9152 MHz
9.8304 MHz
4.9152 MHz
0
1
9600 bps
9600 bps
4800 bps
9600 bps
4800 bps
IRQ1 = VDD + VHI
1
X
X
Blank reset vector,
IRQ1 = VDD
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Monitor ROM (MON)
Monitor ROM (MON)
9.4.3 Data Format
Communication with the monitor ROM is in standard non-return-to-zero
(NRZ) mark/space data format. (See Figure 9-3 and Figure 9-4.)
NEXT
START
BIT
START
BIT
STOP
BIT
BIT 0
BIT 1
BIT 2
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
Figure 9-3. Monitor Data Format
NEXT
START
BIT
START
BIT
STOP
BIT
$A5
BIT 0
BIT 0
BIT 1
BIT 1
BIT 2
BIT 2
BIT 3
BIT 3
BIT 4
BIT 4
BIT 5
BIT 5
BIT 6
BIT 6
BIT 7
BIT 7
STOP
BIT
START
BIT
NEXT
START
BIT
BREAK
Figure 9-4. Sample Monitor Waveforms
The data transmit and receive rate can be anywhere from 4800 baud to
28.8k-baud. Transmit and receive baud rates must be identical.
9.4.4 Echoing
As shown in Figure 9-5, the monitor ROM immediately echoes each
received byte back to the PTB0 pin for error checking.
SENT TO
MONITOR
READ
READ
ADDR. HIGH ADDR. HIGH ADDR. LOW ADDR. LOW
DATA
ECHO
RESULT
Figure 9-5. Read Transaction
Any result of a command appears after the echo of the last byte of the
command.
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Monitor ROM (MON)
MOTOROLA
Monitor ROM (MON)
Functional Description
9.4.5 Break Signal
A start bit followed by nine low bits is a break signal. (See Figure 9-6.)
When the monitor receives a break signal, it drives the PTB0 pin high for
the duration of two bits before echoing the break signal.
MISSING STOP BIT
TWO-STOP-BIT DELAY BEFORE ZERO ECHO
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
Figure 9-6. Break Transaction
9.4.6 Commands
The monitor ROM uses the following commands:
• READ (read memory)
• WRITE (write memory)
• IREAD (indexed read)
• IWRITE (indexed write)
• READSP (read stack pointer)
• RUN (run user program)
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Technical Data
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Monitor ROM (MON)
Monitor ROM (MON)
Table 9-4. READ (Read Memory) Command
Description
Read byte from memory
Operand
Specifies 2-byte address in high byte:low byte order
Returns contents of specified address
$4A
Data Returned
Opcode
Command Sequence
SENT TO
MONITOR
READ
READ
ADDR. HIGH
ADDR. HIGH
ADDR. LOW
ADDR. LOW
DATA
ECHO
RESULT
Table 9-5. WRITE (Write Memory) Command
Description
Write byte to memory
Operand
Specifies 2-byte address in high byte:low byte order; low byte followed by data byte
Data Returned
Opcode
None
$49
Command Sequence
SENT TO
MONITOR
WRITE
WRITE
ADDR. HIGH
ADDR. HIGH
ADDR. LOW
ADDR. LOW
DATA
DATA
ECHO
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MOTOROLA
Monitor ROM (MON)
Monitor ROM (MON)
Functional Description
Table 9-6. IREAD (Indexed Read) Command
Description
Read next 2 bytes in memory from last address accessed
Specifies 2-byte address in high byte:low byte order
Returns contents of next two addresses
$1A
Operand
Data Returned
Opcode
Command Sequence
SENT TO
MONITOR
IREAD
IREAD
DATA
DATA
RESULT
ECHO
Table 9-7. IWRITE (Indexed Write) Command
Description
Write to last address accessed + 1
Operand
Specifies single data byte
Data Returned
Opcode
None
$19
Command Sequence
SENT TO
MONITOR
IWRITE
IWRITE
DATA
DATA
ECHO
NOTE: A sequence of IREAD or IWRITE commands can sequentially access a
block of memory over the full 64-Kbyte memory map.
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Monitor ROM (MON)
Monitor ROM (MON)
Table 9-8. READSP (Read Stack Pointer) Command
Description
Reads stack pointer
Operand
None
Data Returned
Opcode
Returns stack pointer in high byte:low byte order
$0C
Command Sequence
SENT TO
MONITOR
READSP
READSP
SP HIGH
SP LOW
RESULT
ECHO
Table 9-9. RUN (Run User Program) Command
Description
Executes RTI instruction
Operand
None
None
$28
Data Returned
Opcode
Command Sequence
SENT TO
MONITOR
RUN
RUN
ECHO
Technical Data
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Monitor ROM (MON)
Monitor ROM (MON)
Security
9.5 Security
A security feature discourages unauthorized reading of FLASH locations
while in monitor mode. The host can bypass the security feature at
monitor mode entry by sending eight security bytes that match the bytes
at locations $FFF6–$FFFD. Locations $FFF6–$FFFD contain user-
defined data.
NOTE: Do not leave locations $FFF6–$FFFD blank. For security reasons,
program locations $FFF6–$FFFD even if they are not used for vectors.
During monitor mode entry, the MCU waits after the power-on reset for
the host to send the eight security bytes on pin PTB0. If the received
bytes match those at locations $FFF6–$FFFD, the host bypasses the
security feature and can read all FLASH locations and execute code
from FLASH. Security remains bypassed until a power-on reset occurs.
If the reset was not a power-on reset, security remains bypassed and
security code entry is not required. (See Figure 9-7.)
V
DD
4096 + 32 OSCXCLK CYCLES
24 BUS CYCLES
RST
FROM HOST
FROM MCU
PTB0
1
4
1
1
2
4
1
NOTES:
1 = Echo delay, 2 bit times
2 = Data return delay, 2 bit times
4 = Wait 1 bit time before sending next byte.
Figure 9-7. Monitor Mode Entry Timing
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
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Monitor ROM (MON)
Monitor ROM (MON)
Upon power-on reset, if the received bytes of the security code do not
match the data at locations $FFF6–$FFFD, the host fails to bypass the
security feature. The MCU remains in monitor mode, but reading a
FLASH location returns an invalid value and trying to execute code from
FLASH causes an illegal address reset. After receiving the eight security
bytes from the host, the MCU transmits a break character, signifying that
it is ready to receive a command.
NOTE: The MCU does not transmit a break character until after the host sends
the eight security bytes.
To determine whether the security code entered is correct, check to see
if bit 6 of RAM address $40 is set. If it is, then the correct security code
has been entered and FLASH can be accessed.
If the security sequence fails, the device should be reset by a power-on
reset and brought up in monitor mode to attempt another entry. After
failing the security sequence, the FLASH module can also be mass
erased by executing an erase routine that was downloaded into internal
RAM. The mass erase operation clears the security code locations so
that all eight security bytes become $FF (blank).
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MOTOROLA
Technical Data – MC68H(R)C908JL3E/JK3E/JK1E
Section 10. Timer Interface Module (TIM)
10.1 Contents
10.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .122
10.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .122
10.4 Pin Name Conventions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .122
10.5 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .123
10.5.1 TIM Counter Prescaler . . . . . . . . . . . . . . . . . . . . . . . . . . . .125
10.5.2 Input Capture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .125
10.5.3 Output Compare. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .125
10.5.3.1
10.5.3.2
Unbuffered Output Compare . . . . . . . . . . . . . . . . . . . . .126
Buffered Output Compare . . . . . . . . . . . . . . . . . . . . . . .127
10.5.4 Pulse Width Modulation (PWM) . . . . . . . . . . . . . . . . . . . . .127
10.5.4.1
10.5.4.2
10.5.4.3
Unbuffered PWM Signal Generation . . . . . . . . . . . . . . .128
Buffered PWM Signal Generation . . . . . . . . . . . . . . . . .129
PWM Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . .130
10.6 Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .131
10.7 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .131
10.7.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .132
10.7.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .132
10.8 TIM During Break Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . .132
10.9 I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .133
10.10 I/O Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .133
10.10.1 TIM Status and Control Register (TSC) . . . . . . . . . . . . . . .134
10.10.2 TIM Counter Registers (TCNTH:TCNTL). . . . . . . . . . . . . .136
10.10.3 TIM Counter Modulo Registers (TMODH:TMODL) . . . . . .137
10.10.4 TIM Channel Status and Control Registers (TSC0:TSC1).138
10.10.5 TIM Channel Registers (TCH0H/L:TCH1H/L) . . . . . . . . . .142
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA Timer Interface Module (TIM)
Technical Data
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Timer Interface Module (TIM)
10.2 Introduction
This section describes the timer interface module (TIM2, Version B). The
TIM is a two-channel timer that provides a timing reference with input
capture, output compare, and pulse-width-modulation functions.
Figure 10-1 is a block diagram of the TIM.
10.3 Features
Features of the TIM include the following:
• Two input capture/output compare channels
– Rising-edge, falling-edge, or any-edge input capture trigger
– Set, clear, or toggle output compare action
• Buffered and unbuffered pulse width modulation (PWM) signal
generation
• Programmable TIM clock input with 7-frequency internal bus clock
prescaler selection
• Free-running or modulo up-count operation
• Toggle any channel pin on overflow
• TIM counter stop and reset bits
10.4 Pin Name Conventions
The TIM share two I/O pins with two port D I/O pins. The full name of the
TIM I/O pins are listed in Table 10-1. The generic pin name appear in the
text that follows.
Table 10-1. Pin Name Conventions
TIM Generic Pin Names:
Full TIM Pin Names:
TCH0
TCH1
PTD4/TCH0
PTD5/TCH1
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Timer Interface Module (TIM)
Functional Description
10.5 Functional Description
Figure 10-1 shows the structure of the TIM. The central component of
the TIM is the 16-bit TIM counter that can operate as a free-running
counter or a modulo up-counter. The TIM counter provides the timing
reference for the input capture and output compare functions. The TIM
counter modulo registers, TMODH:TMODL, control the modulo value of
the TIM counter. Software can read the TIM counter value at any time
without affecting the counting sequence.
The two TIM channels are programmable independently as input
capture or output compare channels.
PRESCALER SELECT
INTERNAL
BUS CLOCK
PRESCALER
TSTOP
TRST
PS2
PS1
PS0
16-BIT COUNTER
TOF
INTERRUPT
LOGIC
TOIE
16-BIT COMPARATOR
TMODH:TMODL
TOV0
ELS0B
ELS0A
PORT
LOGIC
CHANNEL 0
16-BIT COMPARATOR
TCH0H:TCH0L
CH0MAX
TCH0
CH0F
INTERRUPT
LOGIC
16-BIT LATCH
MS0A
CH0IE
MS0B
CH1F
TOV1
ELS1B
ELS1A
PORT
LOGIC
CHANNEL 1
16-BIT COMPARATOR
TCH1H:TCH1L
CH1MAX
TCH1
INTERRUPT
LOGIC
16-BIT LATCH
MS1A
CH1IE
Figure 10-1. TIM Block Diagram
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA Timer Interface Module (TIM)
Technical Data
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Timer Interface Module (TIM)
Addr.
Register Name
Bit 7
6
5
4
0
3
2
1
Bit 0
Read: TOF
0
TIM Status and Control
Register
(TSC)
TOIE
TSTOP
PS2
PS1
PS0
$0020
Write:
0
0
TRST
0
Reset:
0
1
0
0
0
0
Read: Bit15
Write:
Bit14
Bit13
Bit12
Bit11
Bit10
Bit9
Bit8
TIM Counter Register High
(TCNTH)
$0021
$0022
$0023
$0024
$0025
$0026
$0027
$0028
Reset:
Read:
Write:
Reset:
Read:
Write:
Reset:
Read:
Write:
Reset:
0
0
0
0
0
0
0
0
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
TIM Counter Register Low
(TCNTL)
0
Bit15
1
0
Bit14
1
0
Bit13
1
0
Bit12
1
0
Bit11
1
0
Bit10
1
0
Bit9
1
0
Bit8
1
TIM Counter Modulo
Register High
(TMODH)
TIM Counter Modulo
Register Low
(TMODL)
Bit7
1
Bit6
1
Bit5
1
Bit4
1
Bit3
1
Bit2
1
Bit1
1
Bit0
1
Read: CH0F
TIM Channel 0 Status and
Control Register
(TSC0)
CH0IE
0
MS0B
0
MS0A
0
ELS0B ELS0A
TOV0 CH0MAX
Write:
Reset:
Read:
Write:
Reset:
Read:
Write:
Reset:
0
0
0
0
0
0
TIM Channel 0
Register High
(TCH0H)
Bit15
Bit14
Bit13
Bit12
Bit11
Bit10
Bit9
Bit8
Indeterminate after reset
TIM Channel 0
Register Low
(TCH0L)
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Indeterminate after reset
Read: CH1F
0
0
TIM Channel 1 Status and
Control Register
(TSC1)
CH1IE
0
MS1A
0
ELS1B ELS1A
TOV1 CH1MAX
Write:
0
0
Reset:
0
0
0
0
Figure 10-2. TIM I/O Register Summary
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Timer Interface Module (TIM) MOTOROLA
Timer Interface Module (TIM)
Functional Description
Read:
Write:
Reset:
Read:
Write:
Reset:
TIM Channel 1
Register High
(TCH1H)
Bit15
Bit7
Bit14
Bit6
Bit13
Bit5
Bit12
Bit11
Bit10
Bit2
Bit9
Bit1
Bit8
Bit0
$0029
$002A
Indeterminate after reset
TIM Channel 1
Register Low
(TCH1L)
Bit4
Bit3
Indeterminate after reset
= Unimplemented
Figure 10-2. TIM I/O Register Summary
10.5.1 TIM Counter Prescaler
The TIM clock source is one of the seven prescaler outputs. The
prescaler generates seven clock rates from the internal bus clock. The
prescaler select bits, PS[2:0], in the TIM status and control register
(TSC) select the TIM clock source.
10.5.2 Input Capture
With the input capture function, the TIM can capture the time at which an
external event occurs. When an active edge occurs on the pin of an input
capture channel, the TIM latches the contents of the TIM counter into the
TIM channel registers, TCHxH:TCHxL. The polarity of the active edge is
programmable. Input captures can generate TIM CPU interrupt
requests.
10.5.3 Output Compare
With the output compare function, the TIM can generate a periodic pulse
with a programmable polarity, duration, and frequency. When the
counter reaches the value in the registers of an output compare channel,
the TIM can set, clear, or toggle the channel pin. Output compares can
generate TIM CPU interrupt requests.
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA Timer Interface Module (TIM)
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Timer Interface Module (TIM)
10.5.3.1 Unbuffered Output Compare
Any output compare channel can generate unbuffered output compare
pulses as described in 10.5.3 Output Compare. The pulses are
unbuffered because changing the output compare value requires writing
the new value over the old value currently in the TIM channel registers.
An unsynchronized write to the TIM channel registers to change an
output compare value could cause incorrect operation for up to two
counter overflow periods. For example, writing a new value before the
counter reaches the old value but after the counter reaches the new
value prevents any compare during that counter overflow period. Also,
using a TIM overflow interrupt routine to write a new, smaller output
compare value may cause the compare to be missed. The TIM may pass
the new value before it is written.
Use the following methods to synchronize unbuffered changes in the
output compare value on channel x:
• When changing to a smaller value, enable channel x output
compare interrupts and write the new value in the output compare
interrupt routine. The output compare interrupt occurs at the end
of the current output compare pulse. The interrupt routine has until
the end of the counter overflow period to write the new value.
• When changing to a larger output compare value, enable TIM
overflow interrupts and write the new value in the TIM overflow
interrupt routine. The TIM overflow interrupt occurs at the end of
the current counter overflow period. Writing a larger value in an
output compare interrupt routine (at the end of the current pulse)
could cause two output compares to occur in the same counter
overflow period.
Technical Data
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Timer Interface Module (TIM)
MOTOROLA
Timer Interface Module (TIM)
Functional Description
10.5.3.2 Buffered Output Compare
Channels 0 and 1 can be linked to form a buffered output compare
channel whose output appears on the TCH0 pin. The TIM channel
registers of the linked pair alternately control the output.
Setting the MS0B bit in TIM channel 0 status and control register (TSC0)
links channel 0 and channel 1. The output compare value in the TIM
channel 0 registers initially controls the output on the TCH0 pin. Writing
to the TIM channel 1 registers enables the TIM channel 1 registers to
synchronously control the output after the TIM overflows. At each
subsequent overflow, the TIM channel registers (0 or 1) that control the
output are the ones written to last. TSC0 controls and monitors the
buffered output compare function, and TIM channel 1 status and control
register (TSC1) is unused. While the MS0B bit is set, the channel 1 pin,
TCH1, is available as a general-purpose I/O pin.
NOTE: In buffered output compare operation, do not write new output compare
values to the currently active channel registers. User software should
track the currently active channel to prevent writing a new value to the
active channel. Writing to the active channel registers is the same as
generating unbuffered output compares.
10.5.4 Pulse Width Modulation (PWM)
By using the toggle-on-overflow feature with an output compare channel,
the TIM can generate a PWM signal. The value in the TIM counter
modulo registers determines the period of the PWM signal. The channel
pin toggles when the counter reaches the value in the TIM counter
modulo registers. The time between overflows is the period of the PWM
signal.
As Figure 10-3 shows, the output compare value in the TIM channel
registers determines the pulse width of the PWM signal. The time
between overflow and output compare is the pulse width. Program the
TIM to clear the channel pin on output compare if the state of the PWM
pulse is logic one. Program the TIM to set the pin if the state of the PWM
pulse is logic zero.
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA Timer Interface Module (TIM)
Technical Data
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Timer Interface Module (TIM)
OVERFLOW
OVERFLOW
OVERFLOW
PERIOD
PULSE
WIDTH
TCHx
OUTPUT
COMPARE
OUTPUT
COMPARE
OUTPUT
COMPARE
Figure 10-3. PWM Period and Pulse Width
The value in the TIM counter modulo registers and the selected
prescaler output determines the frequency of the PWM output. The
frequency of an 8-bit PWM signal is variable in 256 increments. Writing
$00FF (255) to the TIM counter modulo registers produces a PWM
period of 256 times the internal bus clock period if the prescaler select
value is 000 (see 10.10.1 TIM Status and Control Register (TSC)).
The value in the TIM channel registers determines the pulse width of the
PWM output. The pulse width of an 8-bit PWM signal is variable in 256
increments. Writing $0080 (128) to the TIM channel registers produces
a duty cycle of 128/256 or 50%.
10.5.4.1 Unbuffered PWM Signal Generation
Any output compare channel can generate unbuffered PWM pulses as
described in 10.5.4 Pulse Width Modulation (PWM). The pulses are
unbuffered because changing the pulse width requires writing the new
pulse width value over the old value currently in the TIM channel
registers.
An unsynchronized write to the TIM channel registers to change a pulse
width value could cause incorrect operation for up to two PWM periods.
For example, writing a new value before the counter reaches the old
value but after the counter reaches the new value prevents any compare
during that PWM period. Also, using a TIM overflow interrupt routine to
write a new, smaller pulse width value may cause the compare to be
missed. The TIM may pass the new value before it is written.
Technical Data
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Timer Interface Module (TIM)
MOTOROLA
Timer Interface Module (TIM)
Functional Description
Use the following methods to synchronize unbuffered changes in the
PWM pulse width on channel x:
• When changing to a shorter pulse width, enable channel x output
compare interrupts and write the new value in the output compare
interrupt routine. The output compare interrupt occurs at the end
of the current pulse. The interrupt routine has until the end of the
PWM period to write the new value.
• When changing to a longer pulse width, enable TIM overflow
interrupts and write the new value in the TIM overflow interrupt
routine. The TIM overflow interrupt occurs at the end of the current
PWM period. Writing a larger value in an output compare interrupt
routine (at the end of the current pulse) could cause two output
compares to occur in the same PWM period.
NOTE: In PWM signal generation, do not program the PWM channel to toggle
on output compare. Toggling on output compare prevents reliable 0%
duty cycle generation and removes the ability of the channel to self-
correct in the event of software error or noise. Toggling on output
compare also can cause incorrect PWM signal generation when
changing the PWM pulse width to a new, much larger value.
10.5.4.2 Buffered PWM Signal Generation
Channels 0 and 1 can be linked to form a buffered PWM channel whose
output appears on the TCH0 pin. The TIM channel registers of the linked
pair alternately control the pulse width of the output.
Setting the MS0B bit in TIM channel 0 status and control register (TSC0)
links channel 0 and channel 1. The TIM channel 0 registers initially
control the pulse width on the TCH0 pin. Writing to the TIM channel 1
registers enables the TIM channel 1 registers to synchronously control
the pulse width at the beginning of the next PWM period. At each
subsequent overflow, the TIM channel registers (0 or 1) that control the
pulse width are the ones written to last. TSC0 controls and monitors the
buffered PWM function, and TIM channel 1 status and control register
(TSC1) is unused. While the MS0B bit is set, the channel 1 pin, TCH1,
is available as a general-purpose I/O pin.
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MOTOROLA Timer Interface Module (TIM)
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Timer Interface Module (TIM)
NOTE: In buffered PWM signal generation, do not write new pulse width values
to the currently active channel registers. User software should track the
currently active channel to prevent writing a new value to the active
channel. Writing to the active channel registers is the same as
generating unbuffered PWM signals.
10.5.4.3 PWM Initialization
To ensure correct operation when generating unbuffered or buffered
PWM signals, use the following initialization procedure:
1. In the TIM status and control register (TSC):
a. Stop the TIM counter by setting the TIM stop bit, TSTOP.
b. Reset the TIM counter and prescaler by setting the TIM reset
bit, TRST.
2. In the TIM counter modulo registers (TMODH:TMODL), write the
value for the required PWM period.
3. In the TIM channel x registers (TCHxH:TCHxL), write the value for
the required pulse width.
4. In TIM channel x status and control register (TSCx):
a. Write 0:1 (for unbuffered output compare or PWM signals) or
1:0 (for buffered output compare or PWM signals) to the mode
select bits, MSxB:MSxA. (See Table 10-3.)
b. Write 1 to the toggle-on-overflow bit, TOVx.
c. Write 1:0 (to clear output on compare) or 1:1 (to set output on
compare) to the edge/level select bits, ELSxB:ELSxA. The
output action on compare must force the output to the
complement of the pulse width level. (See Table 10-3.)
NOTE: In PWM signal generation, do not program the PWM channel to toggle
on output compare. Toggling on output compare prevents reliable 0%
duty cycle generation and removes the ability of the channel to self-
correct in the event of software error or noise. Toggling on output
compare can also cause incorrect PWM signal generation when
changing the PWM pulse width to a new, much larger value.
5. In the TIM status control register (TSC), clear the TIM stop bit,
TSTOP.
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Timer Interface Module (TIM)
MOTOROLA
Timer Interface Module (TIM)
Interrupts
Setting MS0B links channels 0 and 1 and configures them for buffered
PWM operation. The TIM channel 0 registers (TCH0H:TCH0L) initially
control the buffered PWM output. TIM status control register 0 (TSC0)
controls and monitors the PWM signal from the linked channels. MS0B
takes priority over MS0A.
Clearing the toggle-on-overflow bit, TOVx, inhibits output toggles on TIM
overflows. Subsequent output compares try to force the output to a state
it is already in and have no effect. The result is a 0% duty cycle output.
Setting the channel x maximum duty cycle bit (CHxMAX) and setting the
TOVx bit generates a 100% duty cycle output. (See 10.10.4 TIM
Channel Status and Control Registers (TSC0:TSC1).)
10.6 Interrupts
The following TIM sources can generate interrupt requests:
• TIM overflow flag (TOF) — The TOF bit is set when the TIM
counter reaches the modulo value programmed in the TIM counter
modulo registers. The TIM overflow interrupt enable bit, TOIE,
enables TIM overflow CPU interrupt requests. TOF and TOIE are
in the TIM status and control register.
• TIM channel flags (CH1F:CH0F) — The CHxF bit is set when an
input capture or output compare occurs on channel x. Channel x
TIM CPU interrupt requests are controlled by the channel x
interrupt enable bit, CHxIE. Channel x TIM CPU interrupt requests
are enabled when CHxIE=1. CHxF and CHxIE are in the TIM
channel x status and control register.
10.7 Low-Power Modes
The WAIT and STOP instructions put the MCU in low power-
consumption standby modes.
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA Timer Interface Module (TIM)
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Timer Interface Module (TIM)
10.7.1 Wait Mode
The TIM remains active after the execution of a WAIT instruction. In wait
mode, the TIM registers are not accessible by the CPU. Any enabled
CPU interrupt request from the TIM can bring the MCU out of wait mode.
If TIM functions are not required during wait mode, reduce power
consumption by stopping the TIM before executing the WAIT instruction.
10.7.2 Stop Mode
The TIM is inactive after the execution of a STOP instruction. The STOP
instruction does not affect register conditions or the state of the TIM
counter. TIM operation resumes when the MCU exits stop mode after an
external interrupt.
10.8 TIM During Break Interrupts
A break interrupt stops the TIM counter.
The system integration module (SIM) controls whether status bits in
other modules can be cleared during the break state. The BCFE bit in
the break flag control register (BFCR) enables software to clear status
bits during the break state. (See 7.8.3 Break Flag Control Register
(BFCR).)
To allow software to clear status bits during a break interrupt, write a
logic one to the BCFE bit. If a status bit is cleared during the break state,
it remains cleared when the MCU exits the break state.
To protect status bits during the break state, write a logic zero to the
BCFE bit. With BCFE at logic zero (its default state), software can read
and write I/O registers during the break state without affecting status
bits. Some status bits have a two-step read/write clearing procedure. If
software does the first step on such a bit before the break, the bit cannot
change during the break state as long as BCFE is at logic zero. After the
break, doing the second step clears the status bit.
Technical Data
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Timer Interface Module (TIM)
MOTOROLA
Timer Interface Module (TIM)
I/O Signals
10.9 I/O Signals
Port D shares two of its pins with the TIM. The two TIM channel I/O pins
are PTD4/TCH0 and PTD5/TCH1.
Each channel I/O pin is programmable independently as an input
capture pin or an output compare pin. PTD4/TCH0 can be configured as
a buffered output compare or buffered PWM pin.
10.10 I/O Registers
The following I/O registers control and monitor operation of the TIM:
• TIM status and control register (TSC)
• TIM counter registers (TCNTH:TCNTL)
• TIM counter modulo registers (TMODH:TMODL)
• TIM channel status and control registers (TSC0 and TSC1)
• TIM channel registers (TCH0H:TCH0L and TCH1H:TCH1L)
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA Timer Interface Module (TIM)
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Timer Interface Module (TIM)
10.10.1 TIM Status and Control Register (TSC)
The TIM status and control register does the following:
• Enables TIM overflow interrupts
• Flags TIM overflows
• Stops the TIM counter
• Resets the TIM counter
• Prescales the TIM counter clock
Address: $0020
Bit 7
TOF
6
TOIE
0
5
TSTOP
1
4
0
3
0
2
PS2
0
1
PS1
0
Bit 0
PS0
0
Read:
Write:
Reset:
0
0
TRST
0
0
= Unimplemented
Figure 10-4. TIM Status and Control Register (TSC)
TOF — TIM Overflow Flag Bit
This read/write flag is set when the TIM counter reaches the modulo
value programmed in the TIM counter modulo registers. Clear TOF by
reading the TIM status and control register when TOF is set and then
writing a logic zero to TOF. If another TIM overflow occurs before the
clearing sequence is complete, then writing logic zero to TOF has no
effect. Therefore, a TOF interrupt request cannot be lost due to
inadvertent clearing of TOF. Reset clears the TOF bit. Writing a logic
one to TOF has no effect.
1 = TIM counter has reached modulo value
0 = TIM counter has not reached modulo value
TOIE — TIM Overflow Interrupt Enable Bit
This read/write bit enables TIM overflow interrupts when the TOF bit
becomes set. Reset clears the TOIE bit.
1 = TIM overflow interrupts enabled
0 = TIM overflow interrupts disabled
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Timer Interface Module (TIM)
MOTOROLA
Timer Interface Module (TIM)
I/O Registers
TSTOP — TIM Stop Bit
This read/write bit stops the TIM counter. Counting resumes when
TSTOP is cleared. Reset sets the TSTOP bit, stopping the TIM
counter until software clears the TSTOP bit.
1 = TIM counter stopped
0 = TIM counter active
NOTE: Do not set the TSTOP bit before entering wait mode if the TIM is required
to exit wait mode.
TRST — TIM Reset Bit
Setting this write-only bit resets the TIM counter and the TIM
prescaler. Setting TRST has no effect on any other registers.
Counting resumes from $0000. TRST is cleared automatically after
the TIM counter is reset and always reads as logic zero. Reset clears
the TRST bit.
1 = Prescaler and TIM counter cleared
0 = No effect
NOTE: Setting the TSTOP and TRST bits simultaneously stops the TIM counter
at a value of $0000.
PS[2:0] — Prescaler Select Bits
These read/write bits select one of the seven prescaler outputs as the
input to the TIM counter as Table 10-2 shows. Reset clears the
PS[2:0] bits.
Table 10-2. Prescaler Selection
PS2
0
PS1
0
PS0
0
TIM Clock Source
Internal Bus Clock ÷ 1
Internal Bus Clock ÷ 2
Internal Bus Clock ÷ 4
Internal Bus Clock ÷ 8
Internal Bus Clock ÷ 16
Internal Bus Clock ÷ 32
Internal Bus Clock ÷ 64
Not available
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
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MOTOROLA Timer Interface Module (TIM)
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Timer Interface Module (TIM)
10.10.2 TIM Counter Registers (TCNTH:TCNTL)
The two read-only TIM counter registers contain the high and low bytes
of the value in the TIM counter. Reading the high byte (TCNTH) latches
the contents of the low byte (TCNTL) into a buffer. Subsequent reads of
TCNTH do not affect the latched TCNTL value until TCNTL is read.
Reset clears the TIM counter registers. Setting the TIM reset bit (TRST)
also clears the TIM counter registers.
NOTE: If you read TCNTH during a break interrupt, be sure to unlatch TCNTL
by reading TCNTL before exiting the break interrupt. Otherwise, TCNTL
retains the value latched during the break.
Address: $0021
Bit 7
TCNTH
6
5
4
3
2
1
Bit 0
Bit8
Read:
Write:
Reset:
Bit15
Bit14
Bit13
Bit12
Bit11
Bit10
Bit9
0
0
0
0
0
0
0
0
Address: $0022
Bit 7
TCNTL
6
5
4
3
2
1
Bit 0
Bit0
Read:
Write:
Reset:
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
0
0
0
0
0
0
0
0
= Unimplemented
Figure 10-5. TIM Counter Registers (TCNTH:TCNTL)
Technical Data
136
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
Timer Interface Module (TIM) MOTOROLA
Timer Interface Module (TIM)
I/O Registers
10.10.3 TIM Counter Modulo Registers (TMODH:TMODL)
The read/write TIM modulo registers contain the modulo value for the
TIM counter. When the TIM counter reaches the modulo value, the
overflow flag (TOF) becomes set, and the TIM counter resumes counting
from $0000 at the next timer clock. Writing to the high byte (TMODH)
inhibits the TOF bit and overflow interrupts until the low byte (TMODL) is
written. Reset sets the TIM counter modulo registers.
Address: $0023
Bit 7
TMODH
6
5
Bit13
1
4
Bit12
1
3
Bit11
1
2
Bit10
1
1
Bit9
1
Bit 0
Bit8
1
Read:
Bit15
Write:
Bit14
1
Reset:
1
Address: $0024
Bit 7
TMODL
6
5
Bit5
1
4
Bit4
1
3
Bit3
1
2
Bit2
1
1
Bit1
1
Bit 0
Bit0
1
Read:
Bit7
Write:
Bit6
1
Reset:
1
Figure 10-6. TIM Counter Modulo Registers (TMODH:TMODL)
NOTE: Reset the TIM counter before writing to the TIM counter modulo registers.
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MOTOROLA Timer Interface Module (TIM)
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Timer Interface Module (TIM)
10.10.4 TIM Channel Status and Control Registers (TSC0:TSC1)
Each of the TIM channel status and control registers does the following:
• Flags input captures and output compares
• Enables input capture and output compare interrupts
• Selects input capture, output compare, or PWM operation
• Selects high, low, or toggling output on output compare
• Selects rising edge, falling edge, or any edge as the active input
capture trigger
• Selects output toggling on TIM overflow
• Selects 0% and 100% PWM duty cycle
• Selects buffered or unbuffered output compare/PWM operation
Address: $0025
TSC0
6
Bit 7
5
MS0B
0
4
MS0A
0
3
ELS0B
0
2
ELS0A
0
1
TOV0
0
Bit 0
CH0MAX
0
Read: CH0F
CH0IE
0
Write:
0
0
Reset:
Address: $0028
Bit 7
TSC1
6
5
0
4
MS1A
0
3
ELS1B
0
2
ELS1A
0
1
TOV1
0
Bit 0
CH1MAX
0
Read: CH1F
CH1IE
0
Write:
0
0
Reset:
0
= Unimplemented
Figure 10-7. TIM Channel Status and Control Registers (TSC0:TSC1)
Technical Data
138
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
Timer Interface Module (TIM)
MOTOROLA
Timer Interface Module (TIM)
I/O Registers
CHxF — Channel x Flag Bit
When channel x is an input capture channel, this read/write bit is set
when an active edge occurs on the channel x pin. When channel x is
an output compare channel, CHxF is set when the value in the TIM
counter registers matches the value in the TIM channel x registers.
When TIM CPU interrupt requests are enabled (CHxIE=1), clear
CHxF by reading the TIM channel x status and control register with
CHxF set and then writing a logic zero to CHxF. If another interrupt
request occurs before the clearing sequence is complete, then writing
logic zero to CHxF has no effect. Therefore, an interrupt request
cannot be lost due to inadvertent clearing of CHxF.
Reset clears the CHxF bit. Writing a logic one to CHxF has no effect.
1 = Input capture or output compare on channel x
0 = No input capture or output compare on channel x
CHxIE — Channel x Interrupt Enable Bit
This read/write bit enables TIM CPU interrupt service requests on
channel x. Reset clears the CHxIE bit.
1 = Channel x CPU interrupt requests enabled
0 = Channel x CPU interrupt requests disabled
MSxB — Mode Select Bit B
This read/write bit selects buffered output compare/PWM operation.
MSxB exists only in the TIM channel 0 status and control register.
Setting MS0B disables the channel 1 status and control register and
reverts TCH1 to general-purpose I/O.
Reset clears the MSxB bit.
1 = Buffered output compare/PWM operation enabled
0 = Buffered output compare/PWM operation disabled
MSxA — Mode Select Bit A
When ELSxB:ELSxA ≠ 0:0, this read/write bit selects either input
capture operation or unbuffered output compare/PWM operation.
See Table 10-3.
1 = Unbuffered output compare/PWM operation
0 = Input capture operation
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA Timer Interface Module (TIM)
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Timer Interface Module (TIM)
When ELSxB:ELSxA = 0:0, this read/write bit selects the initial output
level of the TCHx pin. (See Table 10-3.) Reset clears the MSxA bit.
1 = Initial output level low
0 = Initial output level high
NOTE: Before changing a channel function by writing to the MSxB or MSxA bit,
set the TSTOP and TRST bits in the TIM status and control register
(TSC).
ELSxB and ELSxA — Edge/Level Select Bits
When channel x is an input capture channel, these read/write bits
control the active edge-sensing logic on channel x.
When channel x is an output compare channel, ELSxB and ELSxA
control the channel x output behavior when an output compare
occurs.
When ELSxB and ELSxA are both clear, channel x is not connected
to an I/O port, and pin TCHx is available as a general-purpose I/O pin.
Table 10-3 shows how ELSxB and ELSxA work. Reset clears the
ELSxB and ELSxA bits.
Table 10-3. Mode, Edge, and Level Selection
MSxB MSxA ELSxB ELSxA
Mode
Configuration
Pin under Port Control;
Initial Output Level High
X
X
0
1
0
0
0
0
Output
Preset
Pin under Port Control;
Initial Output Level Low
0
0
0
0
0
0
1
1
0
0
0
1
1
1
X
X
0
1
1
0
1
1
0
1
1
0
1
1
0
1
1
0
Capture on Rising Edge Only
Capture on Falling Edge Only
Capture on Rising or Falling Edge
Toggle Output on Compare
Input
Capture
Output
Compare Clear Output on Compare
or PWM
Set Output on Compare
Buffered
Output
Compareor
Buffered
PWM
Toggle Output on Compare
Clear Output on Compare
1
X
1
1
Set Output on Compare
Technical Data
140
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
Timer Interface Module (TIM) MOTOROLA
Timer Interface Module (TIM)
I/O Registers
NOTE: Before enabling a TIM channel register for input capture operation, make
sure that the TCHx pin is stable for at least two bus clocks.
TOVx — Toggle-On-Overflow Bit
When channel x is an output compare channel, this read/write bit
controls the behavior of the channel x output when the TIM counter
overflows. When channel x is an input capture channel, TOVx has no
effect. Reset clears the TOVx bit.
1 = Channel x pin toggles on TIM counter overflow.
0 = Channel x pin does not toggle on TIM counter overflow.
NOTE: When TOVx is set, a TIM counter overflow takes precedence over a
channel x output compare if both occur at the same time.
CHxMAX — Channel x Maximum Duty Cycle Bit
When the TOVx bit is at logic one, setting the CHxMAX bit forces the
duty cycle of buffered and unbuffered PWM signals to 100%. As
Figure 10-8 shows, the CHxMAX bit takes effect in the cycle after it
is set or cleared. The output stays at the 100% duty cycle level until
the cycle after CHxMAX is cleared.
OVERFLOW
OVERFLOW
OVERFLOW
OVERFLOW
OVERFLOW
PERIOD
TCHx
OUTPUT
COMPARE
OUTPUT
COMPARE
OUTPUT
COMPARE
OUTPUT
COMPARE
CHxMAX
Figure 10-8. CHxMAX Latency
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA Timer Interface Module (TIM)
Technical Data
141
Timer Interface Module (TIM)
10.10.5 TIM Channel Registers (TCH0H/L:TCH1H/L)
These read/write registers contain the captured TIM counter value of the
input capture function or the output compare value of the output
compare function. The state of the TIM channel registers after reset is
unknown.
In input capture mode (MSxB:MSxA = 0:0), reading the high byte of the
TIM channel x registers (TCHxH) inhibits input captures until the low
byte (TCHxL) is read.
In output compare mode (MSxB:MSxA ≠ 0:0), writing to the high byte of
the TIM channel x registers (TCHxH) inhibits output compares until the
low byte (TCHxL) is written.
Address: $0026
Bit 7
TCH0H
6
5
4
3
2
1
Bit 0
Bit8
Read:
Bit15
Write:
Bit14
Bit13
Bit12
Bit11
Bit10
Bit9
Reset:
Indeterminate after reset
Address: $0027
Bit 7
TCH0L
6
5
4
3
2
1
Bit 0
Bit0
Read:
Bit7
Write:
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Reset:
Indeterminate after reset
Address: $0029
Bit 7
TCH1H
6
5
4
3
2
1
Bit 0
Bit8
Read:
Bit15
Write:
Bit14
Bit13
Bit12
Bit11
Bit10
Bit9
Reset:
Indeterminate after reset
Address:
$02A
Bit 7
TCH1L
6
5
4
3
2
1
Bit 0
Bit0
Read:
Write:
Reset:
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Indeterminate after reset
Figure 10-9. TIM Channel Registers (TCH0H/L:TCH1H/L)
Technical Data
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MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
Timer Interface Module (TIM) MOTOROLA
Technical Data – MC68H(R)C908JL3E/JK3E/JK1E
Section 11. Analog-to-Digital Converter (ADC)
11.1 Contents
11.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .143
11.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .144
11.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .144
11.4.1 ADC Port I/O Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .145
11.4.2 Voltage Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .146
11.4.3 Conversion Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .146
11.4.4 Continuous Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . .146
11.4.5 Accuracy and Precision . . . . . . . . . . . . . . . . . . . . . . . . . . .147
11.5 Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .147
11.6 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .147
11.6.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .147
11.6.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .147
11.7 I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .147
11.7.1 ADC Voltage In (ADCVIN) . . . . . . . . . . . . . . . . . . . . . . . . .148
11.8 I/O Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .148
11.8.1 ADC Status and Control Register. . . . . . . . . . . . . . . . . . . .148
11.8.2 ADC Data Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .151
11.8.3 ADC Input Clock Register . . . . . . . . . . . . . . . . . . . . . . . . .151
11.2 Introduction
This section describes the 12-channel, 8-bit linear successive
approximation analog-to-digital converter (ADC).
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA Analog-to-Digital Converter (ADC)
Technical Data
143
Analog-to-Digital Converter (ADC)
11.3 Features
Features of the ADC module include:
• 12 channels with multiplexed input
• Linear successive approximation with monotonicity
• 8-bit resolution
• Single or continuous conversion
• Conversion complete flag or conversion complete interrupt
• Selectable ADC clock
Addr.
Register Name
Bit 7
6
5
4
3
2
1
Bit 0
Read: COCO
ADC Status and Control
AIEN
ADCO
ADCH4
ADCH3
ADCH2
ADCH1
ADCH0
$003C
Register Write:
(ADSCR)
Reset:
Read:
Write:
Reset:
Read:
Write:
Reset:
0
0
0
1
1
1
1
1
AD7
AD6
AD5
AD4
AD3
AD2
AD1
AD0
ADC Data Register
(ADR)
$003D
$003E
Indeterminate after reset
0
0
0
0
0
0
0
0
ADIV2
0
ADIV1
0
ADIV0
0
ADC Input Clock Register
(ADICLK)
0
0
Figure 11-1. ADC I/O Register Summary
11.4 Functional Description
Twelve ADC channels are available for sampling external sources at
pins PTB0–PTB7 and PTD0–PTD3. An analog multiplexer allows the
single ADC converter to select one of the 12 ADC channels as ADC
voltage input (ADCVIN). ADCVIN is converted by the successive
approximation register-based counters. The ADC resolution is 8 bits.
When the conversion is completed, ADC puts the result in the ADC data
register and sets a flag or generates an interrupt. Figure 11-2 shows a
block diagram of the ADC.
Technical Data
144
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
Analog-to-Digital Converter (ADC)
MOTOROLA
Analog-to-Digital Converter (ADC)
Functional Description
INTERNAL
DATA BUS
READ DDRB/DDRD
WRITE DDRB/DDRD
DISABLE
DDRBx/DDRDx
PTBx/PTDx
RESET
WRITE PTB/PTD
READ PTB/PTD
ADCx
DISABLE
ADC CHANNEL x
ADC DATA REGISTER
ADC VOLTAGE IN
ADCVIN
CONVERSION
COMPLETE
CHANNEL
SELECT
INTERRUPT
LOGIC
ADCH[4:0]
ADC
(1 OF 12 CHANNELS)
ADC CLOCK
AIEN
COCO
CLOCK
GENERATOR
BUS CLOCK
ADIV[2:0]
ADICLK
Figure 11-2. ADC Block Diagram
11.4.1 ADC Port I/O Pins
PTB0–PTB7 and PTD0–PTD3 are general-purpose I/O pins that are
shared with the ADC channels. The channel select bits (ADC status and
control register, $003C), define which ADC channel/port pin will be used
as the input signal. The ADC overrides the port I/O logic by forcing that
pin as input to the ADC. The remaining ADC channels/port pins are
controlled by the port I/O logic and can be used as general-purpose I/O.
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Analog-to-Digital Converter (ADC)
Writes to the port register or DDR will not have any affect on the port pin
that is selected by the ADC. Read of a port pin which is in use by the
ADC will return a logic 0 if the corresponding DDR bit is at logic 0. If the
DDR bit is at logic 1, the value in the port data latch is read.
11.4.2 Voltage Conversion
When the input voltage to the ADC equals VDD, the ADC converts the
signal to $FF (full scale). If the input voltage equals VSS, the ADC
converts it to $00. Input voltages between VDD and VSS are a
straight-line linear conversion. All other input voltages will result in $FF
if greater than VDD and $00 if less than VSS.
NOTE: Input voltage should not exceed the analog supply voltages.
11.4.3 Conversion Time
Fourteen ADC internal clocks are required to perform one conversion.
The ADC starts a conversion on the first rising edge of the ADC internal
clock immediately following a write to the ADSCR. If the ADC internal
clock is selected to run at 1MHz, then one conversion will take 14µs to
complete. With a 1MHz ADC internal clock the maximum sample rate is
71.43kHz.
14 ADC Clock Cycles
Conversion Time =
ADC Clock Frequency
Number of Bus Cycles = Conversion Time × Bus Frequency
11.4.4 Continuous Conversion
In the continuous conversion mode, the ADC continuously converts the
selected channel filling the ADC data register with new data after each
conversion. Data from the previous conversion will be overwritten
whether that data has been read or not. Conversions will continue until
the ADCO bit is cleared. The COCO bit (ADC status and control register,
$003C) is set after each conversion and can be cleared by writing the
ADC status and control register or reading of the ADC data register.
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Analog-to-Digital Converter (ADC)
Interrupts
11.4.5 Accuracy and Precision
The conversion process is monotonic and has no missing codes.
11.5 Interrupts
When the AIEN bit is set, the ADC module is capable of generating a
CPU interrupt after each ADC conversion. A CPU interrupt is generated
if the COCO bit is at logic 0. The COCO bit is not used as a conversion
complete flag when interrupts are enabled.
11.6 Low-Power Modes
The following subsections describe the ADC in low-power modes.
11.6.1 Wait Mode
The ADC continues normal operation during wait mode. Any enabled
CPU interrupt request from the ADC can bring the MCU out of wait
mode. If the ADC is not required to bring the MCU out of wait mode,
power down the ADC by setting the ADCH[4:0] bits in the ADC status
and control register to logic 1’s before executing the WAIT instruction.
11.6.2 Stop Mode
The ADC module is inactive after the execution of a STOP instruction.
Any pending conversion is aborted. ADC conversions resume when the
MCU exits stop mode. Allow one conversion cycle to stabilize the analog
circuitry before attempting a new ADC conversion after exiting stop
mode.
11.7 I/O Signals
The ADC module has 12 channels that are shared with I/O port B and
port D.
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Analog-to-Digital Converter (ADC)
11.7.1 ADC Voltage In (ADCVIN)
ADCVIN is the input voltage signal from one of the 12 ADC channels to
the ADC module.
11.8 I/O Registers
These I/O registers control and monitor ADC operation:
• ADC status and control register (ADSCR)
• ADC data register (ADR)
• ADC clock register (ADICLK)
11.8.1 ADC Status and Control Register
The following paragraphs describe the function of the ADC status and
control register.
Address: $003C
Bit 7
6
AIEN
0
5
ADCO
0
4
ADCH4
1
3
ADCH3
1
2
ADCH2
1
1
ADCH1
1
Bit 0
ADCH0
1
Read: COCO
Write:
Reset:
0
= Unimplemented
Figure 11-3. ADC Status and Control Register (ADSCR)
COCO — Conversions Complete Bit
When the AIEN bit is a logic 0, the COCO is a read-only bit which is
set each time a conversion is completed. This bit is cleared whenever
the ADC status and control register is written or whenever the ADC
data register is read. Reset clears this bit.
1 = Conversion completed (AIEN = 0)
0 = Conversion not completed (AIEN = 0)
When the AIEN bit is a logic 1 (CPU interrupt enabled), the COCO is
a read-only bit, and will always be logic 0 when read.
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MOTOROLA
Analog-to-Digital Converter (ADC)
I/O Registers
AIEN — ADC Interrupt Enable Bit
When this bit is set, an interrupt is generated at the end of an ADC
conversion. The interrupt signal is cleared when the data register is
read or the status/control register is written. Reset clears the AIEN bit.
1 = ADC interrupt enabled
0 = ADC interrupt disabled
ADCO — ADC Continuous Conversion Bit
When set, the ADC will convert samples continuously and update the
ADR register at the end of each conversion. Only one conversion is
allowed when this bit is cleared. Reset clears the ADCO bit.
1 = Continuous ADC conversion
0 = One ADC conversion
ADCH[4:0] — ADC Channel Select Bits
ADCH[4:0] form a 5-bit field which is used to select one of the ADC
channels. The five channel select bits are detailed in the following
table. Care should be taken when using a port pin as both an analog
and a digital input simultaneously to prevent switching noise from
corrupting the analog signal. (See Table 11-1.)
The ADC subsystem is turned off when the channel select bits are all
set to one. This feature allows for reduced power consumption for the
MCU when the ADC is not used. Reset sets all of these bits to a
logic 1.
NOTE: Recovery from the disabled state requires one conversion cycle to
stabilize.
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Analog-to-Digital Converter (ADC)
Table 11-1. MUX Channel Select
ADCH4
ADCH3
ADCH2
ADCH1
ADCH0
ADC Channel
Input Select
0
0
0
0
0
0
0
0
0
1
1
1
1
1
:
0
0
0
0
1
1
1
1
0
0
0
0
1
:
0
0
1
1
0
0
1
1
0
0
1
1
0
:
0
1
0
1
0
1
0
1
0
1
0
1
0
:
ADC0
ADC1
ADC2
ADC3
ADC4
ADC5
ADC6
ADC7
ADC8
ADC9
ADC10
ADC11
PTB0
PTB1
PTB2
PTB3
PTB4
PTB5
PTB6
PTB7
PTD3
PTD2
PTD1
PTD0
0
0
0
0
0
0
0
0
0
0
0
0
Unused
(see Note 1)
:
—
1
1
1
1
1
1
1
0
0
1
1
1
1
1
1
0
0
1
1
0
1
0
1
0
1
1
—
—
Reserved
Unused
1
1
VDDA (see Note 2)
VSSA (see Note 2)
ADC power off
1
1
NOTES:
1. If any unused channels are selected, the resulting ADC conversion will be unknown.
2. The voltage levels supplied from internal reference nodes as specified in the table are used to verify the
operation of the ADC converter both in production test and for user applications.
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Analog-to-Digital Converter (ADC) MOTOROLA
Analog-to-Digital Converter (ADC)
I/O Registers
11.8.2 ADC Data Register
One 8-bit result register is provided. This register is updated each time
an ADC conversion completes.
Address: $003D
Bit 7
AD7
6
5
4
3
2
1
Bit 0
AD0
Read:
Write:
Reset:
AD6
AD5
AD4
AD3
AD2
AD1
Indeterminate after reset
= Unimplemented
Figure 11-4. ADC Data Register (ADR)
11.8.3 ADC Input Clock Register
This register selects the clock frequency for the ADC.
Address: $003E
Bit 7
ADIV2
0
6
ADIV1
0
5
ADIV0
0
4
0
3
0
2
0
1
0
Bit 0
0
Read:
Write:
Reset:
0
0
0
0
0
= Unimplemented
Figure 11-5. ADC Input Clock Register (ADICLK)
ADIV[2:0] — ADC Clock Prescaler Bits
ADIV[2:0] form a 3-bit field which selects the divide ratio used by the
ADC to generate the internal ADC clock. Table 11-2 shows the
available clock configurations. The ADC clock should be set to
approximately 1MHz.
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Analog-to-Digital Converter (ADC)
Table 11-2. ADC Clock Divide Ratio
ADIV2
ADIV1
ADIV0
ADC Clock Rate
ADC Input Clock ÷ 1
ADC Input Clock ÷ 2
ADC Input Clock ÷ 4
ADC Input Clock ÷ 8
ADC Input Clock ÷ 16
0
0
0
1
1
X
0
1
0
1
X
0
0
0
1
X = don’t care
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MOTOROLA
Technical Data – MC68H(R)C908JL3E/JK3E/JK1E
Section 12. Input/Output (I/O) Ports
12.1 Contents
12.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .153
12.3 Port A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .156
12.3.1 Port A Data Register (PTA) . . . . . . . . . . . . . . . . . . . . . . . .156
12.3.2 Data Direction Register A (DDRA) . . . . . . . . . . . . . . . . . . .157
12.3.3 Port A Input Pull-up Enable Register (PTAPUE) . . . . . . . .158
12.4 Port B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .159
12.4.1 Port B Data Register (PTB) . . . . . . . . . . . . . . . . . . . . . . . .159
12.4.2 Data Direction Register B (DDRB) . . . . . . . . . . . . . . . . . . .160
12.5 Port D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .161
12.5.1 Port D Data Register (PTD) . . . . . . . . . . . . . . . . . . . . . . . .162
12.5.2 Data Direction Register D (DDRD). . . . . . . . . . . . . . . . . . .163
12.5.3 Port D Control Register (PDCR). . . . . . . . . . . . . . . . . . . . .164
12.2 Introduction
Twenty three (23) bidirectional input-output (I/O) pins form three parallel
ports. All I/O pins are programmable as inputs or outputs.
NOTE: Connect any unused I/O pins to an appropriate logic level, either VDD or
VSS. Although the I/O ports do not require termination for proper
operation, termination reduces excess current consumption and the
possibility of electrostatic damage.
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Input/Output (I/O) Ports
Input/Output (I/O) Ports
Addr.
Register Name
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write:
Reset:
Read:
Write:
Reset:
Read:
Write:
Reset:
Read:
Write:
Reset:
Read:
Write:
Reset:
Read:
Write:
Reset:
Read:
Write:
Reset:
Read:
0
PTA6
PTA5
PTA4
PTA3
PTA2
PTA1
PTA0
Port A Data Register
(PTA)
$0000
Unaffected by reset
PTB7
PTB6
PTD6
PTB5
PTD5
PTB4
PTB3
PTB2
PTD2
PTB1
PTD1
PTB0
PTD0
Port B Data Register
(PTB)
$0001
$0003
$0004
$0005
$0007
$000A
$000D
Unaffected by reset
PTD7
PTD4
PTD3
Port D Data Register
(PTD)
Unaffected by reset
0
DDRA6
0
DDRA5
0
DDRA4
0
DDRA3
DDRA2
DDRA1
DDRA0
Data Direction Register A
(DDRA)
0
0
DDRB3
0
0
DDRB2
0
0
DDRB1
0
0
DDRB0
0
DDRB7
0
DDRB6
0
DDRB5
0
DDRB4
0
Data Direction Register B
(DDRB)
DDRD7
DDRD6
DDRD5
DDRD4
DDRD3 DDRD2 DDRD1 DDRD0
Data Direction Register D
(DDRD)
0
0
0
0
0
0
0
0
0
0
0
0
SLOWD7 SLOWD6 PTDPU7 PTDPU6
Port D Control Register
(PDCR)
0
0
0
0
0
0
0
0
Port A Input Pull-up
PTA6EN PTAPUE6 PTAPUE5 PTAPUE4 PTAPUE3 PTAPUE2 PTAPUE1 PTAPUE0
Enable Register Write:
(PTAPUE)
Reset:
0
0
0
0
0
0
0
0
Figure 12-1. I/O Port Register Summary
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Input/Output (I/O) Ports
Input/Output (I/O) Ports
Introduction
Table 12-1. Port Control Register Bits Summary
Module Control
DDR
Port
Bit
Pin
Module
Register
Control Bit
KBIE0
0
1
2
3
4
5
DDRA0
DDRA1
DDRA2
DDRA3
DDRA4
DDRA5
PTA0/KBI0
PTA1/KBI1
PTA2/KBI2
PTA3/KBI3
PTA4/KBI4
PTA5/KBI5
KBIE1
KBIE2
KBI
KBIER ($001B)
KBIE3
A
KBIE4
KBIE5
OSC
KBI
PTAPUE ($000D)
KBIER ($001B)
PTA6EN
KBIE6
6
DDRA6
RCCLK/PTA6/KBI6(1)
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
DDRB0
DDRB1
DDRB2
DDRB3
DDRB4
DDRB5
DDRB6
DDRB7
DDRD0
DDRD1
DDRD2
DDRD3
DDRD4
DDRD5
DDRD6
DDRD7
PTB0/ADC0
PTB1/ADC1
PTB2/ADC2
PTB3/ADC3
PTB4/ADC4
PTB5/ADC5
PTB6/ADC6
PTB7/ADC7
PTD0/ADC11
PTD1/ADC10
PTD2/ADC9
PTD3/ADC8
PTD4/TCH0
PTD5/TCH1
PTD6
B
ADC
ADSCR ($003C)
ADCH[4:0]
ADC
TIM
ADSCR ($003C)
ADCH[4:0]
D
TSC0 ($0025)
ELS0B:ELS0A
TSC1 ($0028)
ELS1B:ELS1A
—
—
—
—
—
—
PTD7
Notes:
1. RCCLK/PTA6/KBI6 pin is only available on MC68HRC908JL3E/JK3E/JK1E devices (RC option);
PTAPUE register has priority control over the port pin.
RCCLK/PTA6/KBI6 is the OSC2 pin on MC68HC908JL3E/JK3E/JK1E devices (X-TAL option).
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
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MOTOROLA
Input/Output (I/O) Ports
Input/Output (I/O) Ports
12.3 Port A
Port A is an 7-bit special function port that shares all seven of its pins
with the keyboard interrupt (KBI) module (see Section 14. Keyboard
Interrupt Module (KBI)). Each port A pin also has software configurable
pull-up device if the corresponding port pin is configured as input port.
PTA0 to PTA5 has direct LED drive capability.
NOTE: PTA0–PTA5 pins are available on MC68H(R)C908JL3E only.
PTA6 pin is available on MC68HRC908JL3E/JK3E/JK1E only.
12.3.1 Port A Data Register (PTA)
The port A data register (PTA) contains a data latch for each of the seven
port A pins.
Address: $0000
Bit 7
0
6
5
4
3
2
1
Bit 0
Read:
Write:
Reset:
PTA6
PTA5
PTA4
PTA3
PTA2
PTA1
PTA0
Unaffected by Reset
LED
(Sink)
LED
(Sink)
LED
(Sink)
LED
(Sink)
LED
(Sink)
LED
(Sink)
Additional Functions:
30k pull-up 30k pull-up 30k pull-up 30k pull-up 30k pull-up 30k pull-up 30k pull-up
Keyboard Keyboard Keyboard Keyboard Keyboard Keyboard Keyboard
Interrupt Interrupt Interrupt Interrupt Interrupt Interrupt Interrupt
Figure 12-2. Port A Data Register (PTA)
PTA[6:0] — Port A Data Bits
These read/write bits are software programmable. Data direction of
each port A pin is under the control of the corresponding bit in data
direction register A. Reset has no effect on port A data.
KBI[6:0] — Port A Keyboard Interrupts
The keyboard interrupt enable bits, KBIE[6:0], in the keyboard
interrupt control register (KBIER) enable the port A pins as external
interrupt pins, (see Section 14. Keyboard Interrupt Module (KBI)).
Technical Data
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MOTOROLA
Input/Output (I/O) Ports
Port A
12.3.2 Data Direction Register A (DDRA)
Data direction register A determines whether each port A pin is an input
or an output. Writing a logic one to a DDRA bit enables the output buffer
for the corresponding port A pin; a logic zero disables the output buffer.
Address:
$0004
Bit 7
0
6
DDRA6
0
5
DDRA5
0
4
DDRA4
0
3
DDRA3
0
2
DDRA2
0
1
DDRA1
0
Bit 0
DDRA0
0
Read:
Write:
Reset:
0
Figure 12-3. Data Direction Register A (DDRA)
DDRA[6:0] — Data Direction Register A Bits
These read/write bits control port A data direction. Reset clears
DDRA[6:0], configuring all port A pins as inputs.
1 = Corresponding port A pin configured as output
0 = Corresponding port A pin configured as input
NOTE: Avoid glitches on port A pins by writing to the port A data register before
changing data direction register A bits from 0 to 1.
Figure 12-4 shows the port A I/O logic.
READ DDRA ($0004)
PTAPUEx
WRITE DDRA ($0004)
DDRAx
RESET
30k
WRITE PTA ($0000)
PTAx
PTAx
READ PTA ($0000)
To Keyboard Interrupt Circuit
Figure 12-4. Port A I/O Circuit
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Input/Output (I/O) Ports
Input/Output (I/O) Ports
When DDRAx is a logic 1, reading address $0000 reads the PTAx data
latch. When DDRAx is a logic 0, reading address $0000 reads the
voltage level on the pin. The data latch can always be written, regardless
of the state of its data direction bit.
12.3.3 Port A Input Pull-up Enable Register (PTAPUE)
The port A input pull-up enable register (PTAPUE) contains a software
configurable pull-up device for each of the seven port A pins. Each bit is
individually configurable and requires the corresponding data direction
register, DDRAx be configured as input. Each pull-up device is
automatically and dynamically disabled when its corresponding DDRAx
bit is configured as output.
Address: $000D
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write:
Reset:
PTA6EN PTAPUE6 PTAPUE5 PTAPUE4 PTAPUE3 PTAPUE2 PTAPUE1 PTAPUE0
0
0
0
0
0
0
0
0
Figure 12-5. Port A Input Pull-up Enable Register (PTAPUE)
PTA6EN — Enable PTA6 on OSC2
This read/write bit configures the OSC2 pin function when RC
oscillator option is selected. This bit has no effect for X-tal oscillator
option.
1 = OSC2 pin configured for PTA6 I/O, and has all the interrupt and
pull-up functions
0 = OSC2 pin outputs the RC oscillator clock (RCCLK)
PTAPUE[6:0] — Port A Input Pull-up Enable Bits
These read/write bits are software programmable to enable pull-up
devices on port A pins
1 = Corresponding port A pin configured to have internal pull-up if
its DDRA bit is set to 0
0 = Pull-up device is disconnected on the corresponding port A pin
regardless of the state of its DDRA bit
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MOTOROLA
Input/Output (I/O) Ports
Port B
Table 12-2 summarizes the operation of the port A pins.
Table 12-2. Port A Pin Functions
Accesses to DDRA
Accesses to PTA
DDRA
Bit
PTAPUE Bit
PTA Bit
I/O Pin Mode
Read/Write
DDRA[6:0]
DDRA[6:0]
DDRA[6:0]
Read
Write
X(1)
X
Input, VDD
Pin
Pin
PTA[6:0](3)
PTA[6:0](3)
PTA[6:0]
(2)
1
0
0
1
0
X
Input, Hi-Z(4)
Output
X
PTA[6:0]
Notes:
1. X = Don’t care.
2. I/O pin pulled to VDD by internal pull-up.
3. Writing affects data register, but does not affect input.
4. Hi-Z = High Impedance.
12.4 Port B
Port B is an 8-bit special function port that shares all eight of its port pins
with the analog-to-digital converter (ADC) module, see Section 11.
12.4.1 Port B Data Register (PTB)
The port B data register contains a data latch for each of the eight port B
pins.
Address: $0001
Bit 7
6
5
4
3
2
1
Bit 0
Read:
PTB7
Write:
PTB6
PTB5
PTB4
PTB3
PTB2
PTB1
PTB0
Reset:
Unaffected by reset
ADC4 ADC3
Alternative Function: ADC7
ADC6
ADC5
ADC2
ADC2
ADC0
Figure 12-6. Port B Data Register (PTB)
PTB[7:0] — Port B Data Bits
These read/write bits are software programmable. Data direction of
each port B pin is under the control of the corresponding bit in data
direction register B. Reset has no effect on port B data.
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Input/Output (I/O) Ports
Input/Output (I/O) Ports
ADC[7:0] — ADC channels 7 to 0
ADC[7:0] are pins used for the input channels to the analog-to-digital
converter module. The channel select bits, ADCH[4:0], in the ADC
status and control register define which port pin will be used as an
ADC input and overrides any control from the port I/O logic. See
Section 11. Analog-to-Digital Converter (ADC).
12.4.2 Data Direction Register B (DDRB)
Data direction register B determines whether each port B pin is an input
or an output. Writing a logic one to a DDRB bit enables the output buffer
for the corresponding port B pin; a logic zero disables the output buffer.
Address:
$0005
Bit 7
6
DDRB6
0
5
DDRB5
0
4
DDRB4
0
3
DDRB3
0
2
DDRB2
0
1
DDRB1
0
Bit 0
DDRB0
0
Read:
Write:
Reset:
DDRB7
0
Figure 12-7. Data Direction Register B (DDRB)
DDRB[7:0] — Data Direction Register B Bits
These read/write bits control port B data direction. Reset clears
DDRB[7:0], configuring all port B pins as inputs.
1 = Corresponding port B pin configured as output
0 = Corresponding port B pin configured as input
NOTE: Avoid glitches on port B pins by writing to the port B data register before
changing data direction register B bits from 0 to 1. Figure 12-8 shows
the port B I/O logic.
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MOTOROLA
Input/Output (I/O) Ports
Port D
READ DDRB ($0005)
WRITE DDRB ($0005)
DDRBx
PTBx
RESET
WRITE PTB ($0001)
READ PTB ($0001)
PTBx
To Analog-To-Digital Converter
Figure 12-8. Port B I/O Circuit
When DDRBx is a logic 1, reading address $0001 reads the PTBx data
latch. When DDRBx is a logic 0, reading address $0001 reads the
voltage level on the pin. The data latch can always be written, regardless
of the state of its data direction bit. Table 12-3 summarizes the operation
of the port B pins.
Table 12-3. Port B Pin Functions
Accesses to DDRB Accesses to PTB
DDRB Bit PTB Bit I/O Pin Mode
Read/Write
DDRB[7:0]
DDRB[7:0]
Read
Write
0
1
X(1)
X
Input, Hi-Z(2)
Output
Pin
PTB[7:0](3)
Pin
PTB[7:0]
Notes:
1. X = don’t care.
2. Hi-Z = high impedance.
3. Writing affects data register, but does not affect the input.
12.5 Port D
Port D is an 8-bit special function port that shares two of its pins with
timer interface module, (see Section 10.) and shares four of its pins with
analog-to-digital converter module (see Section 11.). PTD6 and PTD7
each has high current drive (25mA sink) and programmable pull-up.
PTD2, PTD3, PTD6 and PTD7 each has LED driving (sink) capability.
NOTE: PTD0–PTD1 are available on MC68H(R)C908JL3E only.
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Input/Output (I/O) Ports
12.5.1 Port D Data Register (PTD)
The port D data register contains a data latch for each of the eight port D
pins.
Address: $0003
Bit 7
6
5
4
3
2
1
Bit 0
Read:
PTD7
Write:
PTD6
PTD5
PTD4
PTD3
PTD2
PTD1
PTD0
Reset:
Unaffected by reset
LED
(Sink)
LED
(Sink)
LED
(Sink)
LED
(Sink)
Additional Functions
ADC8
TCH0
ADC9
ADC10
ADC11
TCH1
25mA sink 25mA sink
(Slow Edge) (Slow Edge)
5k pull-up 5k pull-up
Figure 12-9. Port D Data Register (PTD)
PTD[7:0] — Port D Data Bits
These read/write bits are software programmable. Data direction of
each port D pin is under the control of the corresponding bit in data
direction register D. Reset has no effect on port D data.
ADC[11:8] — ADC channels 11 to 8
ADC[11:8] are pins used for the input channels to the analog-to-digital
converter module. The channel select bits, ADCH[4:0], in the ADC
status and control register define which port pin will be used as an
ADC input and overrides any control from the port I/O logic. See
Section 11. Analog-to-Digital Converter (ADC).
TCH[1:0] — Timer Channel I/O
The TCH1 and TCH0 pins are the TIM input capture/output compare
pins. The edge/level select bits, ELSxB:ELSxA, determine whether
the PTD4/TCH0 and PTD5/TCH1 pins are timer channel I/O pins or
general-purpose I/O pins. See Section 10. Timer Interface Module
(TIM).
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Input/Output (I/O) Ports
Port D
12.5.2 Data Direction Register D (DDRD)
Data direction register D determines whether each port D pin is an input
or an output. Writing a logic one to a DDRD bit enables the output buffer
for the corresponding port D pin; a logic zero disables the output buffer.
Address:
$0007
Bit 7
6
DDRD6
0
5
4
3
2
DDRD2
0
1
DDRD1
0
Bit 0
DDRD0
0
Read:
Write:
Reset:
DDRD7
0
DDRD5 DDRD4 DDRD3
0
0
0
Figure 12-10. Data Direction Register D (DDRD)
DDRD[7:0] — Data Direction Register D Bits
These read/write bits control port D data direction. Reset clears
DDRD[7:0], configuring all port D pins as inputs.
1 = Corresponding port D pin configured as output
0 = Corresponding port D pin configured as input
NOTE: Avoid glitches on port D pins by writing to the port D data register before
changing data direction register D bits from 0 to 1. Figure 12-11 shows
the port D I/O logic.
READ DDRD ($0007)
PTDPU[6:7]
WRITE DDRD ($0007)
DDRDx
RESET
5k
WRITE PTD ($0003)
PTDx
PTDx
READ PTD ($0003)
PTD[0:3] To Analog-To-Digital Converter
PTD[4:5] To Timer
Figure 12-11. Port D I/O Circuit
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Input/Output (I/O) Ports
Input/Output (I/O) Ports
When DDRDx is a logic 1, reading address $0003 reads the PTDx data
latch. When DDRDx is a logic 0, reading address $0003 reads the
voltage level on the pin. The data latch can always be written, regardless
of the state of its data direction bit. Table 12-4 summarizes the operation
of the port D pins.
Table 12-4. Port D Pin Functions
Accesses
Accesses to PTD
DDRD
Bit
I/O Pin
Mode
to DDRD
PTD Bit
Read/Write
Input, Hi-Z(2) DDRD[7:0]
Read
Pin
Write
PTD[7:0](3)
0
1
X(1)
X
Output DDRD[7:0]
Pin
PTD[7:0]
Notes:
1. X = don’t care.
2. Hi-Z = high impedance.
3. Writing affects data register, but does not affect the input.
12.5.3 Port D Control Register (PDCR)
The port D control register enables/disables the pull-up resistor and
slow-edge high current capability of pins PTD6 and PTD7.
Address:
$000A
Bit 7
0
6
0
5
0
4
0
3
2
1
Bit 0
Read:
Write:
Reset:
SLOWD7 SLOWD6 PTDPU7 PTDPU6
0
0
0
0
0
0
0
0
Figure 12-12. Port D Control Register (PDCR)
SLOWDx — Slow Edge Enable
The SLOWD6 and SLOWD7 bits enable the Slow-edge, open-drain,
high current output (25mA sink) of port pins PTD6 and PTD7
respectively. DDRDx bit is not affected by SLOWDx.
1 = Slow edge enabled; pin is open-drain output
0 = Slow edge disabled; pin is push-pull
PTDPUx — Pull-up Enable
The PTDPU6 and PTDPU7 bits enable the 5kΩ pull-up on PTD6 and
PTD7 respectively, regardless the status of DDRDx bit.
1 = Enable 5kΩ pull-up
0 = Disable 5kΩ pull-up
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MOTOROLA
Technical Data – MC68H(R)C908JL3E/JK3E/JK1E
Section 13. External Interrupt (IRQ)
13.1 Contents
13.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .165
13.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .165
13.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .166
13.4.1 IRQ1 Pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .167
13.5 IRQ Module During Break Interrupts . . . . . . . . . . . . . . . . . . .169
13.6 IRQ Status and Control Register (INTSCR) . . . . . . . . . . . . . .169
13.2 Introduction
13.3 Features
The IRQ (external interrupt) module provides a maskable interrupt input.
Features of the IRQ module include the following:
• A dedicated external interrupt pin, IRQ1
• IRQ1 interrupt control bits
• Hysteresis buffer
• Programmable edge-only or edge and level interrupt sensitivity
• Automatic interrupt acknowledge
• Selectable internal pullup resistor
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External Interrupt (IRQ)
External Interrupt (IRQ)
13.4 Functional Description
A logic zero applied to the external interrupt pin can latch a CPU interrupt
request. Figure 13-1 shows the structure of the IRQ module.
Interrupt signals on the IRQ1 pin are latched into the IRQ1 latch. An
interrupt latch remains set until one of the following actions occurs:
• Vector fetch — A vector fetch automatically generates an interrupt
acknowledge signal that clears the IRQ latch.
• Software clear — Software can clear the interrupt latch by writing
to the acknowledge bit in the interrupt status and control register
(INTSCR). Writing a logic one to the ACK1 bit clears the IRQ1
latch.
• Reset — A reset automatically clears the interrupt latch.
The external interrupt pin is falling-edge-triggered and is software-
configurable to be either falling-edge or falling-edge and low-level-
triggered. The MODE1 bit in the INTSCR controls the triggering
sensitivity of the IRQ1 pin.
When the interrupt pin is edge-triggered only, the CPU interrupt request
remains set until a vector fetch, software clear, or reset occurs.
When the interrupt pin is both falling-edge and low-level-triggered, the
CPU interrupt request remains set until both of the following occur:
• Vector fetch or software clear
• Return of the interrupt pin to logic one
The vector fetch or software clear may occur before or after the interrupt
pin returns to logic one. As long as the pin is low, the interrupt request
remains pending. A reset will clear the latch and the MODE1 control bit,
thereby clearing the interrupt even if the pin stays low.
When set, the IMASK1 bit in the INTSCR mask all external interrupt
requests. A latched interrupt request is not presented to the interrupt
priority logic unless the IMASK1 bit is clear.
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External Interrupt (IRQ)
MOTOROLA
External Interrupt (IRQ)
Functional Description
NOTE: The interrupt mask (I) in the condition code register (CCR) masks all
interrupt requests, including external interrupt requests.(See 7.6
Exception Control.)
ACK1
RESET
TO CPU FOR
BIL/BIH
INSTRUCTIONS
VECTOR
FETCH
DECODER
VDD
IRQPUD
VDD
INTERNAL
IRQF1
PULLUP
DEVICE
CLR
D
Q
SYNCHRO-
NIZER
IRQ1
INTERRUPT
REQUEST
CK
IRQ1
IRQ1
FF
IMASK1
MODE1
HIGH
VOLTAGE
DETECT
TO MODE
SELECT
LOGIC
Figure 13-1. IRQ Module Block Diagram
Addr.
Register Name
IRQ Status and Control
Bit 7
6
5
4
3
2
0
1
Bit 0
Read:
0
0
0
0
IRQF1
IMASK1 MODE1
$001D
Register Write:
(INTSCR)
Reset:
ACK1
0
0
0
0
0
0
0
0
= Unimplemented
Figure 13-2. IRQ I/O Register Summary
13.4.1 IRQ1 Pin
A logic zero on the IRQ1 pin can latch an interrupt request into the IRQ1
latch. A vector fetch, software clear, or reset clears the IRQ1 latch.
If the MODE1 bit is set, the IRQ1 pin is both falling-edge-sensitive and
low-level-sensitive. With MODE1 set, both of the following actions must
occur to clear IRQ1:
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External Interrupt (IRQ)
External Interrupt (IRQ)
• Vector fetch or software clear — A vector fetch generates an
interrupt acknowledge signal to clear the latch. Software may
generate the interrupt acknowledge signal by writing a logic one to
the ACK1 bit in the interrupt status and control register (INTSCR).
The ACK1 bit is useful in applications that poll the IRQ1 pin and
require software to clear the IRQ1 latch. Writing to the ACK1 bit
prior to leaving an interrupt service routine can also prevent
spurious interrupts due to noise. Setting ACK1 does not affect
subsequent transitions on the IRQ1 pin. A falling edge that occurs
after writing to the ACK1 bit latches another interrupt request. If
the IRQ1 mask bit, IMASK1, is clear, the CPU loads the program
counter with the vector address at locations $FFFA and $FFFB.
• Return of the IRQ1 pin to logic one — As long as the IRQ1 pin is
at logic zero, IRQ1 remains active.
The vector fetch or software clear and the return of the IRQ1 pin to logic
one may occur in any order. The interrupt request remains pending as
long as the IRQ1 pin is at logic zero. A reset will clear the latch and the
MODE1 control bit, thereby clearing the interrupt even if the pin stays
low.
If the MODE1 bit is clear, the IRQ1 pin is falling-edge-sensitive only. With
MODE1 clear, a vector fetch or software clear immediately clears the
IRQ1 latch.
The IRQF1 bit in the INTSCR register can be used to check for pending
interrupts. The IRQF1 bit is not affected by the IMASK1 bit, which makes
it useful in applications where polling is preferred.
Use the BIH or BIL instruction to read the logic level on the IRQ1 pin.
NOTE: When using the level-sensitive interrupt trigger, avoid false interrupts by
masking interrupt requests in the interrupt routine.
NOTE: An internal pull-up resistor to VDD is connected to the IRQ1 pin; this can
be disabled by setting the IRQPUD bit in the CONFIG2 register ($001E).
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External Interrupt (IRQ)
IRQ Module During Break Interrupts
13.5 IRQ Module During Break Interrupts
The system integration module (SIM) controls whether the IRQ1 latch
can be cleared during the break state. The BCFE bit in the break flag
control register (BFCR) enables software to clear the latches during the
break state. (See Section 7. System Integration Module (SIM).)
To allow software to clear the IRQ1 latch during a break interrupt, write
a logic one to the BCFE bit. If a latch is cleared during the break state, it
remains cleared when the MCU exits the break state.
To protect the latches during the break state, write a logic zero to the
BCFE bit. With BCFE at logic zero (its default state), writing to the ACK1
bit in the IRQ status and control register during the break state has no
effect on the IRQ latch.
13.6 IRQ Status and Control Register (INTSCR)
The IRQ status and control register (INTSCR) controls and monitors
operation of the IRQ module. The INTSCR has the following functions:
• Shows the state of the IRQ1 flag
• Clears the IRQ1 latch
• Masks IRQ1 and interrupt request
• Controls triggering sensitivity of the IRQ1 interrupt pin
Address: $001D
Bit 7
0
6
0
5
0
4
0
3
2
1
Bit 0
Read:
Write:
Reset:
IRQF1
IMASK1 MODE1
ACK1
0
0
0
0
0
0
0
0
= Unimplemented
Figure 13-3. IRQ Status and Control Register (INTSCR)
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External Interrupt (IRQ)
External Interrupt (IRQ)
IRQF1 — IRQ1 Flag
This read-only status bit is high when the IRQ1 interrupt is pending.
1 = IRQ1 interrupt pending
0 = IRQ1 interrupt not pending
ACK1 — IRQ1 Interrupt Request Acknowledge Bit
Writing a logic one to this write-only bit clears the IRQ1 latch. ACK1
always reads as logic zero. Reset clears ACK1.
IMASK1 — IRQ1 Interrupt Mask Bit
Writing a logic one to this read/write bit disables IRQ1 interrupt
requests. Reset clears IMASK1.
1 = IRQ1 interrupt requests disabled
0 = IRQ1 interrupt requests enabled
MODE1 — IRQ1 Edge/Level Select Bit
This read/write bit controls the triggering sensitivity of the IRQ1 pin.
Reset clears MODE1.
1 = IRQ1 interrupt requests on falling edges and low levels
0 = IRQ1 interrupt requests on falling edges only
Address:
$001E
Bit 7
6
5
4
3
2
1
Bit 0
R
Read:
Write:
Reset:
POR:
IRQPUD
R
R
LVIT1
LVIT0
R
R
Not affected Not affected
0
0
0
0
0
0
0
0
0
0
0
0
0
0
R
= Reserved
Figure 13-4. Configuration Register 2 (CONFIG2)
IRQPUD — IRQ1 Pin Pull-up control bit
1 = Internal pull-up is disconnected
0 = Internal pull-up is connected between IRQ1 pin and VDD
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External Interrupt (IRQ)
Technical Data – MC68H(R)C908JL3E/JK3E/JK1E
Section 14. Keyboard Interrupt Module (KBI)
14.1 Contents
14.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .171
14.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .171
14.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .172
14.4.1 Keyboard Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . .174
14.4.2 Keyboard Status and Control Register. . . . . . . . . . . . . . . .175
14.4.3 Keyboard Interrupt Enable Register. . . . . . . . . . . . . . . . . .176
14.5 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .177
14.5.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .177
14.5.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .177
14.6 Keyboard Module During Break Interrupts . . . . . . . . . . . . . . .177
14.2 Introduction
14.3 Features
The keyboard interrupt module (KBI) provides seven independently
maskable external interrupts which are accessible via PTA0–PTA6 pins.
Features of the keyboard interrupt module include the following:
• Seven keyboard interrupt pins with separate keyboard interrupt
enable bits and one keyboard interrupt mask
• Software configurable pull-up device if input pin is configured as
input port bit
• Programmable edge-only or edge- and level- interrupt sensitivity
• Exit from low-power modes
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171
Keyboard Interrupt Module (KBI)
Addr.
Register Name
Keyboard Status
and Control Register Write:
Bit 7
6
5
4
3
2
1
Bit 0
Read:
0
0
0
0
KEYF
0
ACKK
0
IMASKK MODEK
$001A
(KBSCR)
Reset:
0
0
0
KBIE6
0
0
KBIE5
0
0
KBIE4
0
0
KBIE3
0
0
KBIE1
0
0
KBIE0
0
Read:
Keyboard Interrupt
Enable Register Write:
KBIE2
0
$001B
(KBIER)
Reset:
0
= Unimplemented
Figure 14-1. KBI I/O Register Summary
14.4 Functional Description
INTERNAL BUS
VECTOR FETCH
DECODER
KBI0
ACKK
V
DD
KEYF
RESET
CLR
.
D
Q
SYNCHRONIZER
Keyboard
Interrupt
Request
KBIE0
.
CK
TO PULLUP ENABLE
.
KEYBOARD
INTERRUPT FF
IMASKK
KBI6
MODEK
KBIE6
TO PULLUP ENABLE
Figure 14-2. Keyboard Interrupt Block Diagram
Writing to the KBIE6–KBIE0 bits in the keyboard interrupt enable register
independently enables or disables each port A pin as a keyboard
interrupt pin. Enabling a keyboard interrupt pin in port A also enables its
internal pull-up device irrespective of PTAPUEx bits in the port A input
pull-up enable register (see 12.3.3 Port A Input Pull-up Enable
Register (PTAPUE)). A logic 0 applied to an enabled keyboard interrupt
pin latches a keyboard interrupt request.
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MOTOROLA
Keyboard Interrupt Module (KBI)
Functional Description
A keyboard interrupt is latched when one or more keyboard pins goes
low after all were high. The MODEK bit in the keyboard status and
control register controls the triggering mode of the keyboard interrupt.
• If the keyboard interrupt is edge-sensitive only, a falling edge on a
keyboard pin does not latch an interrupt request if another
keyboard pin is already low. To prevent losing an interrupt request
on one pin because another pin is still low, software can disable
the latter pin while it is low.
• If the keyboard interrupt is falling edge- and low level-sensitive, an
interrupt request is present as long as any keyboard pin is low.
If the MODEK bit is set, the keyboard interrupt pins are both falling edge-
and low level-sensitive, and both of the following actions must occur to
clear a keyboard interrupt request:
• Vector fetch or software clear — A vector fetch generates an
interrupt acknowledge signal to clear the interrupt request.
Software may generate the interrupt acknowledge signal by
writing a logic 1 to the ACKK bit in the keyboard status and control
register KBSCR. The ACKK bit is useful in applications that poll
the keyboard interrupt pins and require software to clear the
keyboard interrupt request. Writing to the ACKK bit prior to leaving
an interrupt service routine can also prevent spurious interrupts
due to noise. Setting ACKK does not affect subsequent transitions
on the keyboard interrupt pins. A falling edge that occurs after
writing to the ACKK bit latches another interrupt request. If the
keyboard interrupt mask bit, IMASKK, is clear, the CPU loads the
program counter with the vector address at locations $FFE0 and
$FFE1.
• Return of all enabled keyboard interrupt pins to logic 1 — As long
as any enabled keyboard interrupt pin is at logic 0, the keyboard
interrupt remains set.
The vector fetch or software clear and the return of all enabled keyboard
interrupt pins to logic 1 may occur in any order.
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MOTOROLA Keyboard Interrupt Module (KBI)
Technical Data
173
Keyboard Interrupt Module (KBI)
If the MODEK bit is clear, the keyboard interrupt pin is falling-edge-
sensitive only. With MODEK clear, a vector fetch or software clear
immediately clears the keyboard interrupt request.
Reset clears the keyboard interrupt request and the MODEK bit, clearing
the interrupt request even if a keyboard interrupt pin stays at logic 0.
The keyboard flag bit (KEYF) in the keyboard status and control register
can be used to see if a pending interrupt exists. The KEYF bit is not
affected by the keyboard interrupt mask bit (IMASKK) which makes it
useful in applications where polling is preferred.
To determine the logic level on a keyboard interrupt pin, disable the pull-
up device, use the data direction register to configure the pin as an input
and then read the data register.
NOTE: Setting a keyboard interrupt enable bit (KBIEx) forces the corresponding
keyboard interrupt pin to be an input, overriding the data direction
register. However, the data direction register bit must be a logic 0 for
software to read the pin.
14.4.1 Keyboard Initialization
When a keyboard interrupt pin is enabled, it takes time for the internal
pull-up to reach a logic 1. Therefore a false interrupt can occur as soon
as the pin is enabled.
To prevent a false interrupt on keyboard initialization:
1. Mask keyboard interrupts by setting the IMASKK bit in the
keyboard status and control register.
2. Enable the KBI pins by setting the appropriate KBIEx bits in the
keyboard interrupt enable register.
3. Write to the ACKK bit in the keyboard status and control register
to clear any false interrupts.
4. Clear the IMASKK bit.
An interrupt signal on an edge-triggered pin can be acknowledged
immediately after enabling the pin. An interrupt signal on an edge- and
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Keyboard Interrupt Module (KBI)
MOTOROLA
Keyboard Interrupt Module (KBI)
Functional Description
level-triggered interrupt pin must be acknowledged after a delay that
depends on the external load.
Another way to avoid a false interrupt:
1. Configure the keyboard pins as outputs by setting the appropriate
DDRA bits in the data direction register A.
2. Write logic 1s to the appropriate port A data register bits.
3. Enable the KBI pins by setting the appropriate KBIEx bits in the
keyboard interrupt enable register.
14.4.2 Keyboard Status and Control Register
• Flags keyboard interrupt requests
• Acknowledges keyboard interrupt requests
• Masks keyboard interrupt requests
• Controls keyboard interrupt triggering sensitivity
Address: $001A
Bit 7
6
0
5
0
4
0
3
2
1
Bit 0
Read:
Write:
Reset:
0
KEYF
0
ACKK
0
IMASKK MODEK
0
0
0
0
0
0
0
= Unimplemented
Figure 14-3. Keyboard Status and Control Register (KBSCR)
Bits 7–4 — Not used
These read-only bits always read as logic 0’s.
KEYF — Keyboard Flag Bit
This read-only bit is set when a keyboard interrupt is pending on port-
A. Reset clears the KEYF bit.
1 = Keyboard interrupt pending
0 = No keyboard interrupt pending
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Technical Data
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Keyboard Interrupt Module (KBI)
ACKK — Keyboard Acknowledge Bit
Writing a logic 1 to this write-only bit clears the keyboard interrupt
request on port-A. ACKK always reads as logic 0. Reset clears ACKK.
IMASKK— Keyboard Interrupt Mask Bit
Writing a logic 1 to this read/write bit prevents the output of the
keyboard interrupt mask from generating interrupt requests on port-A.
Reset clears the IMASKK bit.
1 = Keyboard interrupt requests masked
0 = Keyboard interrupt requests not masked
MODEK — Keyboard Triggering Sensitivity Bit
This read/write bit controls the triggering sensitivity of the keyboard
interrupt pins on port-A. Reset clears MODEK.
1 = Keyboard interrupt requests on falling edges and low levels
0 = Keyboard interrupt requests on falling edges only
14.4.3 Keyboard Interrupt Enable Register
The port-A keyboard interrupt enable register enables or disables each
port-A pin to operate as a keyboard interrupt pin.
Address: $001B
Bit 7
0
6
KBIE6
0
5
KBIE5
0
4
KBIE4
0
3
KBIE3
0
2
KBIE2
0
1
KBIE1
0
Bit 0
KBIE0
0
Read:
Write:
Reset:
0
Figure 14-4. Keyboard Interrupt Enable Register (KBIER)
KBIE6–KBIE0 — Port-A Keyboard Interrupt Enable Bits
Each of these read/write bits enables the corresponding keyboard
interrupt pin on port-A to latch interrupt requests. Reset clears the
keyboard interrupt enable register.
1 = KBIx pin enabled as keyboard interrupt pin
0 = KBIx pin not enabled as keyboard interrupt pin
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MOTOROLA
Keyboard Interrupt Module (KBI)
Low-Power Modes
14.5 Low-Power Modes
The WAIT and STOP instructions put the MCU in low power-
consumption standby modes.
14.5.1 Wait Mode
14.5.2 Stop Mode
The keyboard modules remain active in wait mode. Clearing the
IMASKK bit in the keyboard status and control register enables keyboard
interrupt requests to bring the MCU out of wait mode.
The keyboard module remains active in stop mode. Clearing the
IMASKK bit in the keyboard status and control register enables keyboard
interrupt requests to bring the MCU out of stop mode.
14.6 Keyboard Module During Break Interrupts
The system integration module (SIM) controls whether the keyboard
interrupt latch can be cleared during the break state. The BCFE bit in the
break flag control register (BFCR) enables software to clear status bits
during the break state.
To allow software to clear the keyboard interrupt latch during a break
interrupt, write a logic 1 to the BCFE bit. If a latch is cleared during the
break state, it remains cleared when the MCU exits the break state.
To protect the latch during the break state, write a logic 0 to the BCFE
bit. With BCFE at logic 0 (its default state), writing to the keyboard
acknowledge bit (ACKK) in the keyboard status and control register
during the break state has no effect.
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Technical Data
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Keyboard Interrupt Module (KBI)
Technical Data
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Technical Data – MC68H(R)C908JL3E/JK3E/JK1E
Section 15. Computer Operating Properly (COP)
15.1 Contents
15.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .179
15.3 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .180
15.4 I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .181
15.4.1 2OSCOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .181
15.4.2 COPCTL Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .181
15.4.3 Power-On Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .181
15.4.4 Internal Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .181
15.4.5 Reset Vector Fetch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .182
15.4.6 COPD (COP Disable). . . . . . . . . . . . . . . . . . . . . . . . . . . . .182
15.4.7 COPRS (COP Rate Select) . . . . . . . . . . . . . . . . . . . . . . . .182
15.5 COP Control Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .183
15.6 Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .183
15.7 Monitor Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .183
15.8 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .183
15.8.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .183
15.8.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .184
15.9 COP Module During Break Mode . . . . . . . . . . . . . . . . . . . . . .184
15.2 Introduction
The computer operating properly (COP) module contains a free-running
counter that generates a reset if allowed to overflow. The COP module
helps software recover from runaway code. Prevent a COP reset by
clearing the COP counter periodically. The COP module can be disabled
through the COPD bit in the CONFIG1 register.
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Computer Operating Properly (COP)
15.3 Functional Description
Figure 15-1 shows the structure of the COP module.
SIM
2OSCOUT
SIM RESET CIRCUIT
12-BIT SIM COUNTER
RESET STATUS REGISTER
(1)
INTERNAL RESET SOURCES
RESET VECTOR FETCH
COPCTL WRITE
COP CLOCK
COP MODULE
6-BIT COP COUNTER
COPEN (FROM SIM)
COPD (FROM CONFIG1)
RESET
CLEAR
COP COUNTER
COPCTL WRITE
COP RATE SEL
(COPRS FROM CONFIG1)
NOTE:
1. See SIM section for more details.
Figure 15-1. COP Block Diagram
The COP counter is a free-running 6-bit counter preceded by the 12-bit
system integration module (SIM) counter. If not cleared by software, the
COP counter overflows and generates an asynchronous reset after
218 – 24 or 213 – 24 2OSCOUT cycles; depending on the state of the
COP rate select bit, COPRS, in configuration register 1. With a 218 – 24
2OSCOUT cycle overflow option, a 8MHz crystal gives a COP timeout
period of 32.766 ms. Writing any value to location $FFFF before an
overflow occurs prevents a COP reset by clearing the COP counter and
stages 12 through 5 of the SIM counter.
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MOTOROLA
Computer Operating Properly (COP)
I/O Signals
NOTE: Service the COP immediately after reset and before entering or after
exiting stop mode to guarantee the maximum time before the first COP
counter overflow.
A COP reset pulls the RST pin low for 32 × 2OSCOUT cycles and sets
the COP bit in the reset status register (RSR). (See 7.8.2 Reset Status
Register (RSR).).
NOTE: Place COP clearing instructions in the main program and not in an
interrupt subroutine. Such an interrupt subroutine could keep the COP
from generating a reset even while the main program is not working
properly.
15.4 I/O Signals
The following paragraphs describe the signals shown in Figure 15-1.
15.4.1 2OSCOUT
2OSCOUT is the oscillator output signal. 2OSCOUT frequency is equal
to the crystal frequency or the RC-oscillator frequency.
15.4.2 COPCTL Write
Writing any value to the COP control register (COPCTL) (see 15.5 COP
Control Register) clears the COP counter and clears bits 12 through 5
of the SIM counter. Reading the COP control register returns the low
byte of the reset vector.
15.4.3 Power-On Reset
The power-on reset (POR) circuit in the SIM clears the SIM counter
4096 × 2OSCOUT cycles after power-up.
15.4.4 Internal Reset
An internal reset clears the SIM counter and the COP counter.
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Computer Operating Properly (COP)
15.4.5 Reset Vector Fetch
A reset vector fetch occurs when the vector address appears on the data
bus. A reset vector fetch clears the SIM counter.
15.4.6 COPD (COP Disable)
The COPD signal reflects the state of the COP disable bit (COPD) in the
configuration register (CONFIG). (See Section 5. Configuration
Register (CONFIG).)
15.4.7 COPRS (COP Rate Select)
The COPRS signal reflects the state of the COP rate select bit (COPRS)
in the configuration register 1.
Address: $001F
Bit 7
6
5
R
0
4
LVID
0
3
R
0
2
SSREC
0
1
STOP
0
Bit 0
COPD
0
Read:
Write:
Reset:
COPRS
R
0
0
R
= Reserved
Figure 15-2. Configuration Register 1 (CONFIG1)
COPRS — COP Rate Select Bit
COPRS selects the COP timeout period. Reset clears COPRS.
1 = COP timeout period is (213 – 24) × 2OSCOUT cycles
0 = COP timeout period is (218 – 24) × 2OSCOUT cycles
COPD — COP Disable Bit
COPD disables the COP module.
1 = COP module disabled
0 = COP module enabled
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MOTOROLA
Computer Operating Properly (COP)
COP Control Register
15.5 COP Control Register
The COP control register is located at address $FFFF and overlaps the
reset vector. Writing any value to $FFFF clears the COP counter and
starts a new timeout period. Reading location $FFFF returns the low
byte of the reset vector.
Address: $FFFF
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write:
Reset:
Low byte of reset vector
Clear COP counter
Unaffected by reset
Figure 15-3. COP Control Register (COPCTL)
15.6 Interrupts
The COP does not generate CPU interrupt requests.
15.7 Monitor Mode
The COP is disabled in monitor mode when VDD + VHI is present on the
IRQ1 pin or on the RST pin.
15.8 Low-Power Modes
The WAIT and STOP instructions put the MCU in low-power
consumption standby modes.
15.8.1 Wait Mode
The COP continues to operate during wait mode. To prevent a COP
reset during wait mode, periodically clear the COP counter in a CPU
interrupt routine.
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Computer Operating Properly (COP)
15.8.2 Stop Mode
Stop mode turns off the 2OSCOUT input to the COP and clears the SIM
counter. Service the COP immediately before entering or after exiting
stop mode to ensure a full COP timeout period after entering or exiting
stop mode.
15.9 COP Module During Break Mode
The COP is disabled during a break interrupt when VDD + VHI is present
on the RST pin.
Technical Data
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MOTOROLA
Technical Data – MC68H(R)C908JL3E/JK3E/JK1E
Section 16. Low Voltage Inhibit (LVI)
16.1 Contents
16.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .185
16.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .185
16.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .186
16.5 LVI Control Register (CONFIG2/CONFIG1). . . . . . . . . . . . . .186
16.6 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .187
16.6.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .187
16.6.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .187
16.2 Introduction
16.3 Features
This section describes the low-voltage inhibit module (LVI), which
monitors the voltage on the VDD pin and generates a reset when the VDD
voltage falls to the LVI trip (LVITRIP) voltage.
Features of the LVI module include the following:
• Selectable LVI trip voltage
• Selectable LVI circuit disable
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Technical Data
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Low Voltage Inhibit (LVI)
Low Voltage Inhibit (LVI)
16.4 Functional Description
Figure 16-1 shows the structure of the LVI module. The LVI is enabled
after a reset. The LVI module contains a bandgap reference circuit and
comparator. Setting LVI disable bit (LVID) disables the LVI to monitor
VDD voltage. The LVI trip voltage selection bits (LVIT1, LVIT0) determine
at which VDD level the LVI module should take actions.
The LVI module generates one output signal:
LVI Reset — an reset signal will be generated to reset the CPU when
VDD drops to below the set trip point.
V
DD
LVID
VDD > LVI
VDD < LVI
= 0
= 1
TRIP
TRIP
LVI RESET
LOW V
DD
DETECTOR
LVIT1
LVIT0
Figure 16-1. LVI Module Block Diagram
16.5 LVI Control Register (CONFIG2/CONFIG1)
Address:
$001E
Bit 7
6
5
4
3
2
1
Bit 0
R
Read:
Write:
Reset:
POR:
IRQPUD
R
R
LVIT1
LVIT0
R
R
Not affected Not affected
0
0
0
0
0
0
0
0
0
0
0
0
0
0
R
= Reserved
Figure 16-2. Configuration Register 2 (CONFIG2)
Technical Data
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Low Voltage Inhibit (LVI)
Low Voltage Inhibit (LVI)
Low-Power Modes
Address:
$001F
Bit 7
6
5
R
0
4
LVID
0
3
R
0
2
SSREC
0
1
STOP
0
Bit 0
COPD
0
Read:
Write:
Reset:
COPRS
R
0
0
R
= Reserved
Figure 16-3. Configuration Register 1 (CONFIG1)
LVID — Low Voltage Inhibit Disable Bit
1 = Low voltage inhibit disabled
0 = Low voltage inhibit enabled
LVIT1, LVIT0 — LVI Trip Voltage Selection
These two bits determine at which level of VDD the LVI module will
come into action. LVIT1 and LVIT0 are cleared by a Power-On Reset
only.
Trip Voltage(1)
LVIT1
LVIT0
Comments
0
0
1
1
0
1
0
1
VLVR3 (2.4V)
For VDD=3V operation
For VDD=3V operation
For VDD=5V operation
V
LVR3 (2.4V)
LVR5 (4.0V)
V
Reserved
1. See Section 18. Electrical Specifications for full parameters.
16.6 Low-Power Modes
The STOP and WAIT instructions put the MCU in low-power-
consumption standby modes.
16.6.1 Wait Mode
16.6.2 Stop Mode
The LVI module, when enabled, will continue to operate in WAIT Mode.
The LVI module, when enabled, will continue to operate in STOP Mode.
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
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Technical Data
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Low Voltage Inhibit (LVI)
Low Voltage Inhibit (LVI)
Technical Data
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Low Voltage Inhibit (LVI)
Technical Data – MC68H(R)C908JL3E/JK3E/JK1E
Section 17. Break Module (BREAK)
17.1 Contents
17.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .189
17.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .190
17.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .190
17.4.1 Flag Protection During Break Interrupts. . . . . . . . . . . . . . .192
17.4.2 CPU During Break Interrupts . . . . . . . . . . . . . . . . . . . . . . .192
17.4.3 TIM During Break Interrupts. . . . . . . . . . . . . . . . . . . . . . . .192
17.4.4 COP During Break Interrupts . . . . . . . . . . . . . . . . . . . . . . .192
17.5 Break Module Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . .192
17.5.1 Break Status and Control Register (BRKSCR) . . . . . . . . .193
17.5.2 Break Address Registers . . . . . . . . . . . . . . . . . . . . . . . . . .194
17.5.3 Break Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . .194
17.5.4 Break Flag Control Register (BFCR) . . . . . . . . . . . . . . . . .196
17.6 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .196
17.6.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .196
17.6.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .196
17.2 Introduction
This section describes the break module. The break module can
generate a break interrupt that stops normal program flow at a defined
address to enter a background program.
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Technical Data
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Break Module (BREAK)
Break Module (BREAK)
17.3 Features
Features of the break module include the following:
• Accessible I/O registers during the break Interrupt
• CPU-generated break interrupts
• Software-generated break interrupts
• COP disabling during break interrupts
17.4 Functional Description
When the internal address bus matches the value written in the break
address registers, the break module issues a breakpoint signal (BKPT)
to the SIM. The SIM then causes the CPU to load the instruction register
with a software interrupt instruction (SWI) after completion of the current
CPU instruction. The program counter vectors to $FFFC and $FFFD
($FEFC and $FEFD in monitor mode).
The following events can cause a break interrupt to occur:
• A CPU-generated address (the address in the program counter)
matches the contents of the break address registers.
• Software writes a logic one to the BRKA bit in the break status and
control register.
When a CPU generated address matches the contents of the break
address registers, the break interrupt begins after the CPU completes its
current instruction. A return from interrupt instruction (RTI) in the break
routine ends the break interrupt and returns the MCU to normal
operation. Figure 17-1 shows the structure of the break module.
Technical Data
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MOTOROLA
Break Module (BREAK)
Functional Description
IAB[15:8]
BREAK ADDRESS REGISTER HIGH
8-BIT COMPARATOR
IAB[15:0]
CONTROL
BKPT
(TO SIM)
8-BIT COMPARATOR
BREAK ADDRESS REGISTER LOW
IAB[7:0]
Figure 17-1. Break Module Block Diagram
Addr.
Register Name
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write:
Reset:
Read:
SBSW
See note
0
R
R
R
R
R
R
R
Break Status Register
(BSR)
$FE00
Break Flag Control
BCFE
0
R
R
R
R
R
R
R
$FE03
$FE0C
$FE0D
$FE0E
Register Write:
(BFCR)
Reset:
Read:
Break Address High
Bit15
0
Bit14
0
Bit13
0
Bit12
0
Bit11
0
Bit10
0
Bit9
0
Bit8
0
Register Write:
(BRKH)
Reset:
Read:
Break Address low
Bit7
0
Bit6
0
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Register Write:
(BRKL)
Reset:
0
0
0
0
0
0
0
0
0
0
0
0
Read:
Break Status and Control
BRKE
0
BRKA
0
Register Write:
(BRKSCR)
Reset:
0
0
0
0
0
0
Note: Writing a logic 0 clears SBSW.
= Unimplemented
R
= Reserved
Figure 17-2. Break I/O Register Summary
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Technical Data
191
Break Module (BREAK)
Break Module (BREAK)
17.4.1 Flag Protection During Break Interrupts
The system integration module (SIM) controls whether or not module
status bits can be cleared during the break state. The BCFE bit in the
break flag control register (BFCR) enables software to clear status bits
during the break state. (See 7.8.3 Break Flag Control Register (BFCR)
and see the Break Interrupts subsection for each module.)
17.4.2 CPU During Break Interrupts
The CPU starts a break interrupt by:
• Loading the instruction register with the SWI instruction
• Loading the program counter with $FFFC:$FFFD
($FEFC:$FEFD in monitor mode)
The break interrupt begins after completion of the CPU instruction in
progress. If the break address register match occurs on the last cycle of
a CPU instruction, the break interrupt begins immediately.
17.4.3 TIM During Break Interrupts
A break interrupt stops the timer counter.
17.4.4 COP During Break Interrupts
The COP is disabled during a break interrupt when VDD + VHI is present
on the RST pin.
17.5 Break Module Registers
These registers control and monitor operation of the break module:
• Break status and control register (BRKSCR)
• Break address register high (BRKH)
• Break address register low (BRKL)
• Break status register (BSR)
• Break flag control register (BFCR)
Technical Data
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MOTOROLA
Break Module (BREAK)
Break Module Registers
17.5.1 Break Status and Control Register (BRKSCR)
The break status and control register contains break module enable and
status bits.
Address: $FE0E
Bit 7
BRKE
0
6
BRKA
0
5
0
4
0
3
0
2
0
1
0
Bit 0
0
Read:
Write:
Reset:
0
0
0
0
0
0
= Unimplemented
Figure 17-3. Break Status and Control Register (BRKSCR)
BRKE — Break Enable Bit
This read/write bit enables breaks on break address register matches.
Clear BRKE by writing a logic zero to bit 7. Reset clears the BRKE bit.
1 = Breaks enabled on 16-bit address match
0 = Breaks disabled
BRKA — Break Active Bit
This read/write status and control bit is set when a break address
match occurs. Writing a logic one to BRKA generates a break
interrupt. Clear BRKA by writing a logic zero to it before exiting the
break routine. Reset clears the BRKA bit.
1 = Break address match
0 = No break address match
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Technical Data
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Break Module (BREAK)
Break Module (BREAK)
17.5.2 Break Address Registers
The break address registers contain the high and low bytes of the
desired breakpoint address. Reset clears the break address registers.
Address: $FE0C
Bit 7
Bit 15
0
6
14
0
5
13
0
4
12
0
3
11
0
2
10
0
1
9
0
Bit 0
Bit 8
0
Read:
Write:
Reset:
Figure 17-4. Break Address Register High (BRKH)
Address: $FE0D
Bit 7
6
6
0
5
5
0
4
4
0
3
3
0
2
2
0
1
1
0
Bit 0
Bit 0
0
Read:
Bit 7
Write:
Reset:
0
Figure 17-5. Break Address Register Low (BRKL)
17.5.3 Break Status Register
The break status register contains a flag to indicate that a break caused
an exit from stop or wait mode.
Address: $FE00
Bit 7
R
6
5
4
3
2
1
Bit 0
R
Read:
Write:
Reset:
SBSW
Note(1)
0
R
R
R
R
R
R
= Reserved
1. Writing a logic zero clears SBSW.
Figure 17-6. Break Status Register (BSR)
Technical Data
194
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Break Module (BREAK)
Break Module (BREAK)
Break Module Registers
SBSW — SIM Break Stop/Wait
This status bit is useful in applications requiring a return to wait or stop
mode after exiting from a break interrupt. Clear SBSW by writing a
logic zero to it. Reset clears SBSW.
1 = Stop mode or wait mode was exited by break interrupt
0 = Stop mode or wait mode was not exited by break interrupt
SBSW can be read within the break state SWI routine. The user can
modify the return address on the stack by subtracting one from it. The
following code is an example of this.
; This code works if the H register has been pushed onto the stack in the break
; service routine software. This code should be executed at the end of the
; break service routine software.
HIBYTE EQU
LOBYTE EQU
5
6
;
If not SBSW, do RTI
BRCLR SBSW,BSR, RETURN ; See if wait mode or stop mode was exited
; by break.
TST
BNE
DEC
DEC
LOBYTE,SP
DOLO
; If RETURNLO is not zero,
; then just decrement low byte.
; Else deal with high byte, too.
; Point to WAIT/STOP opcode.
; Restore H register.
HIBYTE,SP
LOBYTE,SP
DOLO
RETURN PULH
RTI
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
195
Break Module (BREAK)
Break Module (BREAK)
17.5.4 Break Flag Control Register (BFCR)
The break control register contains a bit that enables software to clear
status bits while the MCU is in a break state.
Address: $FE03
Bit 7
6
5
4
3
2
1
Bit 0
R
Read:
Write:
Reset:
BCFE
R
R
R
R
R
R
0
R
= Reserved
Figure 17-7. Break Flag Control Register (BFCR)
BCFE — Break Clear Flag Enable Bit
This read/write bit enables software to clear status bits by accessing
status registers while the MCU is in a break state. To clear status bits
during the break state, the BCFE bit must be set.
1 = Status bits clearable during break
0 = Status bits not clearable during break
17.6 Low-Power Modes
The WAIT and STOP instructions put the MCU in low-power-
consumption standby modes.
17.6.1 Wait Mode
17.6.2 Stop Mode
If enabled, the break module is active in wait mode. In the break routine,
the user can subtract one from the return address on the stack if SBSW
is set (see 7.7 Low-Power Modes). Clear the SBSW bit by writing logic
zero to it.
A break interrupt causes exit from stop mode and sets the SBSW bit in
the break status register. See 7.8 SIM Registers.
Technical Data
196
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
Break Module (BREAK)
MOTOROLA
Technical Data – MC68H(R)C908JL3E/JK3E/JK1E
Section 18. Electrical Specifications
18.1 Contents
18.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .197
18.3 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . .198
18.4 Functional Operating Range. . . . . . . . . . . . . . . . . . . . . . . . . .199
18.5 Thermal Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . .199
18.6 5V DC Electrical Characteristics. . . . . . . . . . . . . . . . . . . . . . .200
18.7 5V Control Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .201
18.8 5V Oscillator Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . .202
18.9 3V DC Electrical Characteristics. . . . . . . . . . . . . . . . . . . . . . .203
18.10 3V Control Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .204
18.11 3V Oscillator Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . .205
18.12 Typical Supply Currents . . . . . . . . . . . . . . . . . . . . . . . . . . . . .206
18.13 ADC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .208
18.14 Memory Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . .209
18.2 Introduction
This section contains electrical and timing specifications.
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
197
Electrical Specifications
Electrical Specifications
18.3 Absolute Maximum Ratings
Maximum ratings are the extreme limits to which the MCU can be
exposed without permanently damaging it.
NOTE: This device is not guaranteed to operate properly at the maximum
ratings. Refer to Sections 18.6 and 18.9 for guaranteed operating
conditions.
Table 18-1. Absolute Maximum Ratings
Characteristic(1)
Supply voltage
Symbol
VDD
Value
Unit
V
–0.3 to +6.0
VIN
VSS–0.3 to VDD +0.3
VSS–0.3 to +8.5
Input voltage
V
VDD+VHI
Mode entry voltage, IRQ1 pin
V
Maximum current per pin
excluding VDD and VSS
I
25
mA
TSTG
IMVSS
IMVDD
Storage temperature
Maximum current out of VSS
Maximum current into VDD
NOTES:
–55 to +150
100
°C
mA
mA
100
1. Voltages referenced to VSS
.
NOTE: This device contains circuitry to protect the inputs against damage due
to high static voltages or electric fields; however, it is advised that normal
precautions be taken to avoid application of any voltage higher than
maximum-rated voltages to this high-impedance circuit. For proper
operation, it is recommended that VIN and VOUT be constrained to the
range VSS ≤ (VIN or VOUT) ≤ VDD. Reliability of operation is enhanced if
unused inputs are connected to an appropriate logic voltage level (for
example, either VSS or VDD.)
Technical Data
198
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
Electrical Specifications
MOTOROLA
Electrical Specifications
Functional Operating Range
18.4 Functional Operating Range
Table 18-2. Operating Range
Characteristic
Symbol
Value
– 40 to +125
Unit
°C
TA
Operating temperature range
Operating voltage range
– 40 to +85
3 10%
VDD
5 10%
V
18.5 Thermal Characteristics
Table 18-3. Thermal Characteristics
Characteristic
Symbol
Value
Unit
Thermal resistance
20-pin PDIP
20-pin SOIC
28-pin PDIP
28-pin SOIC
48-pin LQFP
70
70
70
70
80
°C/W
°C/W
°C/W
°C/W
°C/W
θJA
PI/O
PD
I/O pin power dissipation
Power dissipation(1)
User determined
W
PD = (IDD × VDD) + PI/O
K/(TJ + 273 °C)
=
W
PD x (TA + 273 °C)
+ PD2 × θJA
Constant(2)
K
W/°C
°C
TJ
TA + (PD × θJA)
Average junction temperature
NOTES:
1. Power dissipation is a function of temperature.
2. K constant unique to the device. K can be determined for a known TA and measured PD.
With this value of K, PD and TJ can be determined for any value of TA.
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
199
Electrical Specifications
Electrical Specifications
18.6 5V DC Electrical Characteristics
Table 18-4. DC Electrical Characteristics (5V)
Characteristic(1)
Typ(2)
Symbol
Min
Max
Unit
Output high voltage (ILOAD = –2.0mA)
PTA0–PTA6, PTB0–PTB7, PTD0–PTD7
VOH
VDD–0.8
—
—
V
Output low voltage (ILOAD = 1.6mA)
VOL
VOL
IOL
—
—
10
—
—
16
0.4
0.5
22
V
V
PTA6, PTB0–PTB7, PTD0, PTD1, PTD4, PTD5
Output low voltage (ILOAD = 25mA)
PTD6, PTD7
LED drives (VOL = 3V)
mA
PTA0–PTA5, PTD2, PTD3, PTD6, PTD7
Input high voltage
VIH
0.7 × VDD
VDD
PTA0–PTA6, PTB0–PTB7, PTD0–PTD7,
RST, IRQ1, OSC1
—
—
V
V
Input low voltage
VIL
VSS
0.3 × VDD
PTA0–PTA6, PTB0–PTB7, PTD0–PTD7,
RST, IRQ1, OSC1
V
DD supply current, fOP = 4MHz
Run(3)
MC68HC908JL3E/JK3E/JK1E
MC68HRC908JL3E/JK3E/JK1E
Wait(4)
—
—
10
4.5
11
5
mA
mA
MC68HC908JL3E/JK3E/JK1E
MC68HRC908JL3E/JK3E/JK1E
Stop(5)
—
—
6
1
6.5
1.5
mA
mA
IDD
(–40°C to 85°C)
MC68HC908JL3E/JK3E/JK1E
MC68HRC908JL3E/JK3E/JK1E
(–40°C to 125°C)
—
—
2
2
5
5
µA
µA
MC68HC908JL3E/JK3E/JK1E
MC68HRC908JL3E/JK3E/JK1E
—
—
2
2
10
10
µA
µA
IIL
Digital I/O ports Hi-Z leakage current
Input current
—
—
—
—
10
1
µA
µA
IIN
COUT
CIN
Capacitance
—
—
—
—
12
8
pF
Ports (as input or output)
POR rearm voltage(6)
VPOR
RPOR
0
—
—
—
100
—
mV
V/ms
V
POR rise time ramp rate(7)
Monitor mode entry voltage
0.035
VDD+VHI
1.5 × VDD
8.5
Technical Data
200
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Electrical Specifications
Electrical Specifications
5V Control Timing
Table 18-4. DC Electrical Characteristics (5V)
Characteristic(1)
Typ(2)
Symbol
Min
Max
Unit
Pullup resistors(8)
RPU1
RPU2
1.8
16
3.3
26
4.8
36
kΩ
kΩ
PTD6, PTD7
RST, IRQ1, PTA0–PTA6
VLVR5
LVI reset voltage
NOTES:
3.6
4.0
4.4
V
1. VDD = 4.5 to 5.5 Vdc, VSS = 0 Vdc, TA = TL to TH, unless otherwise noted.
2. Typical values reflect average measurements at midpoint of voltage range, 25 °C only.
3. Run (operating) IDD measured using external square wave clock source (fOP = 4MHz). All inputs 0.2V from rail. No dc
loads. Less than 100 pF on all outputs. CL = 20 pF on OSC2. All ports configured as inputs. OSC2 capacitance linearly
affects run IDD. Measured with all modules enabled.
4. Wait IDD measured using external square wave clock source (fOP = 4MHz). All inputs 0.2V from rail. No dc loads. Less
than 100 pF on all outputs. CL = 20 pF on OSC2. All ports configured as inputs. OSC2 capacitance linearly affects
wait IDD
.
5. Stop IDD measured with OSC1 grounded; no port pins sourcing current. LVI is disabled.
6. Maximum is highest voltage that POR is guaranteed.
7. If minimum VDD is not reached before the internal POR reset is released, RST must be driven low externally until
minimum VDD is reached.
8. RPU1 and RPU2 are measured at VDD = 5.0V.
18.7 5V Control Timing
Table 18-5. Control Timing (5V)
Characteristic(1)
Internal operating frequency(2)
Symbol
fOP
Min
—
Max
8
Unit
MHz
ns
RST input pulse width low(3)
tIRL
750
—
NOTES:
1. VDD = 4.5 to 5.5 Vdc, VSS = 0 Vdc, TA = TL to TH; timing shown with respect to 20% VDD and 70% VSS, unless otherwise
noted.
2. Some modules may require a minimum frequency greater than dc for proper operation; see appropriate table for this
information.
3. Minimum pulse width reset is guaranteed to be recognized. It is possible for a smaller pulse width to cause a reset.
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
201
Electrical Specifications
Electrical Specifications
18.8 5V Oscillator Characteristics
Table 18-6. Oscillator Component Specifications (5V)
Characteristic
Symbol
Min
—
2
Typ
10
Max
32
Unit
MHz
MHz
fOSCXCLK
Crystal frequency, XTALCLK
RC oscillator frequency, RCCLK
fRCCLK
10
12
External clock
reference frequency(1)
fOSCXCLK
dc
—
32
MHz
Crystal load capacitance(2)
Crystal fixed capacitance(2)
CL
C1
—
—
—
—
—
—
2 × CL
2 × CL
10 MΩ
—
—
—
—
—
—
Crystal tuning capacitance(2)
Feedback bias resistor
C2
RB
Series resistor(2), (3)
RS
REXT
CEXT
RC oscillator external R
See Figure 18-1
10
RC oscillator external C
NOTES:
—
—
pF
1. No more than 10% duty cycle deviation from 50%.
2. Consult crystal vendor data sheet.
3. Not required for high frequency crystals.
14
12
10
8
C
= 10 pF
EXT
MCU
5V @ 25°C
OSC1
6
V
DD
4
REXT
CEXT
2
0
0
10
20
30
(k
40
50
Resistor, R
Ω)
EXT
Figure 18-1. RC vs. Frequency (5V @25°C)
Technical Data
202
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Electrical Specifications
Electrical Specifications
3V DC Electrical Characteristics
18.9 3V DC Electrical Characteristics
Table 18-7. DC Electrical Characteristics (3V)
Characteristic(1)
Typ(2)
Symbol
Min
Max
Unit
Output high voltage (ILOAD = –1.0mA)
PTA0–PTA6, PTB0–PTB7, PTD0–PTD7
VOH
VDD– 0.4
—
—
V
Output low voltage (ILOAD = 0.8mA)
VOL
VOL
IOL
—
—
3
—
—
6
0.4
0.5
10
V
V
PTA6, PTB0–PTB7, PTD0, PTD1, PTD4, PTD5
Output low voltage (ILOAD = 20mA)
PTD6, PTD7
LED drives (VOL = 1.8V)
mA
PTA0–PTA5, PTD2, PTD3, PTD6, PTD7
Input high voltage
VIH
0.7 × VDD
VDD
PTA0–PTA6, PTB0–PTB7, PTD0–PTD7,
RST, IRQ1, OSC1
—
—
V
V
Input low voltage
VIL
VSS
0.3 × VDD
PTA0–PTA6, PTB0–PTB7, PTD0–PTD7,
RST, IRQ1, OSC1
V
DD supply current, fOP = 2MHz
Run(3)
MC68HC908JL3E/JK3E/JK1E
MC68HRC908JL3E/JK3E/JK1E
Wait(4)
MC68HC908JL3E/JK3E/JK1E
MC68HRC908JL3E/JK3E/JK1E
Stop(5)
—
—
3
1.5
3.5
2
mA
mA
IDD
—
—
1.5
0.2
2
0.3
mA
mA
(–40°C to 85°C)
MC68HC908JL3E/JK3E/JK1E
MC68HRC908JL3E/JK3E/JK1E
—
—
1
1
5
5
µA
µA
IIL
Digital I/O ports Hi-Z leakage current
Input current
—
—
—
—
10
1
µA
µA
IIN
COUT
CIN
Capacitance
—
—
—
—
12
8
pF
Ports (as input or output)
POR rearm voltage(6)
VPOR
RPOR
0
—
—
—
100
—
mV
V/ms
V
POR rise time ramp rate(7)
Monitor mode entry voltage
0.035
VDD+VHI
1.5 × VDD
8.5
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
203
Electrical Specifications
Electrical Specifications
Table 18-7. DC Electrical Characteristics (3V)
Characteristic(1)
Typ(2)
Symbol
Min
Max
Unit
Pullup resistors(8)
PTD6, PTD7
RPU1
RPU2
1.8
16
3.3
26
4.8
36
kΩ
kΩ
RST, IRQ1, PTA0–PTA6
VLVR3
LVI reset voltage
NOTES:
2.0
2.4
2.69
V
1. VDD = 2.7 to 3.3 Vdc, VSS = 0 Vdc, TA = TL to TH, unless otherwise noted.
2. Typical values reflect average measurements at midpoint of voltage range, 25 °C only.
3. Run (operating) IDD measured using external square wave clock source (fOP = 2MHz). All inputs 0.2V from rail. No dc
loads. Less than 100 pF on all outputs. CL = 20 pF on OSC2. All ports configured as inputs. OSC2 capacitance linearly
affects run IDD. Measured with all modules enabled.
4. Wait IDD measured using external square wave clock source (fOP = 2MHz). All inputs 0.2V from rail. No dc loads. Less
than 100 pF on all outputs. CL = 20 pF on OSC2. All ports configured as inputs. OSC2 capacitance linearly affects
wait IDD
.
5. Stop IDD measured with OSC1 grounded; no port pins sourcing current. LVI is disabled.
6. Maximum is highest voltage that POR is guaranteed.
7. If minimum VDD is not reached before the internal POR reset is released, RST must be driven low externally until
minimum VDD is reached.
8. RPU1 and RPU2 are measured at VDD = 5.0V.
18.10 3V Control Timing
Table 18-8. Control Timing (3V)
Characteristic(1)
Internal operating frequency(2)
Symbol
fOP
Min
—
Max
4
Unit
MHz
µs
RST input pulse width low(3)
tIRL
1.5
—
NOTES:
1. VDD = 2.7 to 3.3 Vdc, VSS = 0 Vdc, TA = TL to TH; timing shown with respect to 20% VDD and 70% VDD, unless otherwise
noted.
2. Some modules may require a minimum frequency greater than dc for proper operation; see appropriate table for this infor-
mation.
3. Minimum pulse width reset is guaranteed to be recognized. It is possible for a smaller pulse width to cause a reset.
Technical Data
204
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Electrical Specifications
Electrical Specifications
3V Oscillator Characteristics
18.11 3V Oscillator Characteristics
Table 18-9. Oscillator Component Specifications (3V)
Characteristic
Symbol
Min
—
2
Typ
8
Max
16
Unit
MHz
MHz
fOSCXCLK
Crystal frequency, XTALCLK
RC oscillator frequency, RCCLK
fRCCLK
8
12
External clock
reference frequency(1)
fOSCXCLK
dc
—
16
MHz
Crystal load capacitance(2)
Crystal fixed capacitance(2)
CL
C1
—
—
—
—
—
—
2 × CL
2 × CL
10 MΩ
—
—
—
—
—
—
Crystal tuning capacitance(2)
Feedback bias resistor
C2
RB
Series resistor(2), (3)
RS
REXT
CEXT
RC oscillator external R
See Figure 18-2
10
RC oscillator external C
NOTES:
—
—
pF
1. No more than 10% duty cycle deviation from 50%.
2. Consult crystal vendor data sheet.
3. Not required for high frequency crystals.
14
12
10
8
CEXT = 10 pF
MCU
3V @ 25°C
OSC1
6
V
DD
REXT
CEXT
4
2
0
0
10
20
30
40
50
Resistor, REXT (kΩ)
Figure 18-2. RC vs. Frequency (3V @25°C)
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
205
Electrical Specifications
Electrical Specifications
18.12 Typical Supply Currents
14
12
10
8
6
MC68HC908JL3E/JK3E/JK1E
4
5.5 V
3.3 V
2
0
0
1
2
3
4
5
6
7
8
9
f
or f
(MHz)
BUS
OP
Figure 18-3. Typical Operating IDD (MC68HC908JL3E/JK3E/JK1E),
with All Modules Turned On (25 °C)
10
MC68HRC908JL3E/JK3E/JK1E
8
5.5 V
3.3 V
6
4
2
0
0
1
2
3
4
5
6
7
8
9
f
or f
(MHz)
BUS
OP
Figure 18-4. Typical Operating IDD (MC68HRC908JL3E/JK3E/JK1E),
with All Modules Turned On (25 °C)
Technical Data
206
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Electrical Specifications
Electrical Specifications
Typical Supply Currents
10
8
MC68HC908JL3E/JK3E/JK1E
5.5 V
3.3 V
6
4
2
0
0
1
2
3
4
5
6
7
8
9
f
or f
(MHz)
BUS
OP
Figure 18-5. Typical Wait Mode IDD (MC68HC908JL3E/JK3E/JK1E),
with All Modules Turned Off (25 °C)
2
1.75
1.50
1.25
1
MC68HRC908JL3E/JK3E/JK1E
5.5 V
3.3 V
0.75
0.5
0.25
0
0
1
2
3
4
5
6
7
8
f
or f
(MHz)
OP
BUS
Figure 18-6. Typical Wait Mode IDD (MC68HRC908JL3E/JK3E/JK1E),
with All Modules Turned Off (25 °C)
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
207
Electrical Specifications
Electrical Specifications
18.13 ADC Characteristics
Table 18-10. ADC Characteristics
Characteristic
Supply voltage
Symbol
Min
Max
Unit
Comments
2.7
(VDD min)
5.5
(VDD max)
VDDAD
V
VADIN
BAD
VSS
8
VDD
8
Input voltages
Resolution
V
Bits
LSB
AAD
Absolute accuracy
0.5
1.5
Includes quantization
tAIC = 1/fADIC, tested
only at 1 MHz
fADIC
ADC internal clock
0.5
1.048
VDD
MHz
RAD
tADPU
tADC
tADS
ZADI
FADI
CADI
VSS
16
14
5
Conversion range
Power-up time
V
t
t
t
AIC cycles
AIC cycles
AIC cycles
Conversion time
Sample time(1)
15
—
Zero input reading(2)
Full-scale reading(3)
Input capacitance
00
FE
—
01
Hex
Hex
pF
V
IN = VSS
IN = VDD
Not tested
V
FF
(20) 8
Input leakage(3)
Port B/port D
—
—
1
µA
NOTES:
1. Source impedances greater than 10 kΩ adversely affect internal RC charging time during input sampling.
2. Zero-input/full-scale reading requires sufficient decoupling measures for accurate conversions.
3. The external system error caused by input leakage current is approximately equal to the product of R source and input
current.
Technical Data
208
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Electrical Specifications
Electrical Specifications
Memory Characteristics
18.14 Memory Characteristics
Table 18-11. Memory Characteristics
Characteristic
RAM data retention voltage
Symbol
Min
1.3
1
Max
—
Unit
V
VRDR
FLASH program bus clock frequency
FLASH read bus clock frequency
—
—
MHz
Hz
(1)
32k
8M
fRead
(2)
FLASH page erase time
1
—
ms
tErase
(3)
FLASH mass erase time
4
10
5
—
—
—
—
—
40
—
ms
µs
µs
µs
µs
µs
µs
tMErase
tnvs
tnvh
tnvh1
tpgs
FLASH PGM/ERASE to HVEN set up time
FLASH high-voltage hold time
FLASH high-voltage hold time (mass erase)
FLASH program hold time
100
5
tPROG
FLASH program time
30
1
(4)
FLASH return to read time
trcv
(5)
FLASH cumulative program hv period
—
4
ms
tHV
FLASH row erase endurance(6)
FLASH row program endurance(7)
FLASH data retention time(8)
NOTES:
—
—
—
10k
10k
10
—
—
—
cycles
cycles
years
1. fRead is defined as the frequency range for which the FLASH memory can be read.
2. If the page erase time is longer than tErase (Min), there is no erase-disturb, but it reduces the endurance of the
FLASH memory.
3. If the mass erase time is longer than tMErase (Min), there is no erase-disturb, but it reduces the endurance of
the FLASH memory.
4. trcv is defined as the time it needs before the FLASH can be read after turning off the high voltage charge pump,
by clearing HVEN to logic 0.
5. tHV is defined as the cumulative high voltage programming time to the same row before next erase.
tHV must satisfy this condition: tnvs + tnvh + tpgs + (tPROG × 32) ≤ tHV max.
6. The minimum row endurance value specifies each row of the FLASH memory is guaranteed to work for at least
this many erase / program cycles.
7. The minimum row endurance value specifies each row of the FLASH memory is guaranteed to work for at least
this many erase / program cycles.
8. The FLASH is guaranteed to retain data over the entire operating temperature range for at least the minimum
time specified.
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
209
Electrical Specifications
Electrical Specifications
Technical Data
210
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Electrical Specifications
Technical Data – MC68H(R)C908JL3E/JK3E/JK1E
Section 19. Mechanical Specifications
19.1 Contents
19.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .211
19.3 20-Pin PDIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .212
19.4 20-Pin SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .212
19.5 28-Pin PDIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .213
19.6 28-Pin SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .213
19.7 48-Pin LQFP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .214
19.2 Introduction
This section gives the dimensions for:
• 20-pin plastic dual in-line package (case #738)
• 20-pin small outline integrated circuit package (case #751D)
• 28-pin plastic dual in-line package (case #710)
• 28-pin small outline integrated circuit package (case #751F)
• 48-pin low-profile quad flat pack (case #932)
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
211
Mechanical Specifications
Mechanical Specifications
19.3 20-Pin PDIP
–A–
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEAD WHEN
FORMED PARALLEL.
20
1
11
10
B
4. DIMENSION B DOES NOT INCLUDE MOLD
FLASH.
L
C
INCHES
DIM MIN MAX
1.070 25.66
MILLIMETERS
MIN
MAX
27.17
6.60
4.57
0.55
A
B
C
D
E
F
1.010
0.240
0.150
0.015
0.260
0.180
0.022
6.10
3.81
0.39
–T–
SEATING
PLANE
K
0.050 BSC
1.27 BSC
M
0.050
0.070
1.27
1.77
N
E
G
J
K
L
0.100 BSC
2.54 BSC
0.008
0.110
0.015
0.140
0.21
2.80
0.38
3.55
G
F
J 20 PL
0.300 BSC
7.62 BSC
D 20 PL
0.25 (0.010)
M
M
T B
0.25 (0.010)
M
N
0
0.020
15
0.040
0
0.51
15
1.01
M
M
T A
Figure 19-1. 20-Pin PDIP (Case #738)
19.4 20-Pin SOIC
NOTES:
–A–
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
20
11
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.150
(0.006) PER SIDE.
10X P
–B–
5. DIMENSION D DOES NOT INCLUDE
DAMBAR PROTRUSION. ALLOWABLE
DAMBAR PROTRUSION SHALL BE 0.13
(0.005) TOTAL IN EXCESS OF D DIMENSION
AT MAXIMUM MATERIAL CONDITION.
M
M
B
0.010 (0.25)
1
10
MILLIMETERS
INCHES
20X D
DIM MIN
MAX
12.95
7.60
2.65
0.49
0.90
MIN
MAX
0.510
0.299
0.104
0.019
0.035
J
A
B
C
D
F
12.65
7.40
2.35
0.35
0.50
0.499
0.292
0.093
0.014
0.020
M
S
S
B
0.010 (0.25)
T A
F
G
J
K
M
P
R
1.27 BSC
0.050 BSC
0.25
0.10
0
0.32
0.25
7
0.010
0.004
0
0.012
0.009
7
R X 45
10.05
0.25
10.55
0.75
0.395
0.010
0.415
0.029
C
SEATING
PLANE
–T–
M
18X G
K
Figure 19-2. 20-Pin SOIC (Case #751D)
Technical Data
212
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Mechanical Specifications
Mechanical Specifications
28-Pin PDIP
19.5 28-Pin PDIP
NOTES:
1. POSITIONAL TOLERANCE OF LEADS (D), SHALL
BE WITHIN 0.25 (0.010) AT MAXIMUM MATERIAL
CONDITION, IN RELATION TO SEATING PLANE
AND EACH OTHER.
2. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
28
1
15
14
3. DIMENSION B DOES NOT INCLUDE MOLD FLASH.
B
MILLIMETERS
INCHES
DIM
A
B
C
D
F
MIN
36.45
13.72
3.94
0.36
1.02
MAX
37.21
14.22
5.08
0.56
1.52
MIN
MAX
1.465
0.560
0.200
0.022
0.060
1.435
0.540
0.155
0.014
0.040
L
C
A
N
G
H
J
K
L
2.54 BSC
0.100 BSC
1.65
0.20
2.92
2.16
0.38
3.43
0.065
0.008
0.115
0.085
0.015
0.135
J
G
H
F
M
K
15.24 BSC
0.600 BSC
D
SEATING
M
N
0°
0.51
15°
1.02
0°
0.020
15°
0.040
PLANE
Figure 19-3. 28-Pin PDIP (Case #710)
19.6 28-Pin SOIC
NOTES:
-A-
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSION A AND B DO NOT INCLUDE
MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
15
28
14X
P
M
M
0.010 (0.25)
B
-B-
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE
1
14
DAMBAR PROTRUSION SHALL BE 0.13
(0.005) TOTAL IN EXCESS OF D DIMENSION
AT MAXIMUM MATERIAL CONDITION.
28X
D
M
MILLIMETERS
INCHES
M
S
S
0.010 (0.25)
T
A
B
DIM
A
B
C
D
MIN
17.80
7.40
2.35
0.35
0.41
MAX
18.05
7.60
2.65
0.49
0.90
MIN
MAX
0.711
0.299
0.104
0.019
0.035
R
X 45
0.701
0.292
0.093
0.014
0.016
C
-T-
SEATING
PLANE
F
26X
G
G
J
K
M
P
R
1.27 BSC
0.050 BSC
0.23
0.13
0°
0.32
0.29
8°
10.55
0.75
0.009
0.005
0°
0.013
0.011
8°
0.415
0.029
K
F
10.01
0.25
0.395
0.010
J
Figure 19-4. 28-Pin SOIC (Case #751F)
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Technical Data
213
Mechanical Specifications
Mechanical Specifications
19.7 48-Pin LQFP
4X
NOTES:
0.200 AB T–U
Z
1. DIMENSIONING AND TOLERANCING PER ASME
Y14.5M, 1994.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DATUM PLANE AB IS LOCATED AT BOTTOM OF
LEAD AND IS COINCIDENT WITH THE LEAD
WHERE THE LEAD EXITS THE PLASTIC BODY AT
THE BOTTOM OF THE PARTING LINE.
4. DATUMS T, U, AND Z TO BE DETERMINED AT
DATUM PLANE AB.
DETAIL Y
9
A
P
A1
48
37
5. DIMENSIONS S AND V TO BE DETERMINED AT
SEATING PLANE AC.
1
36
6. DIMENSIONS A AND B DO NOT INCLUDE MOLD
PROTRUSION. ALLOWABLE PROTRUSION IS
0.250 PER SIDE. DIMENSIONS A AND B DO
INCLUDE MOLD MISMATCH AND ARE
DETERMINED AT DATUM PLANE AB.
7. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. DAMBAR PROTRUSION SHALL
NOT CAUSE THE D DIMENSION TO EXCEED
0.350.
T
U
B
V
AE
AE
B1
V1
8. MINIMUM SOLDER PLATE THICKNESS SHALL BE
0.0076.
12
25
9. EXACT SHAPE OF EACH CORNER IS OPTIONAL.
MILLIMETERS
13
24
DIM
A
MIN
MAX
Z
7.000 BSC
A1
B
B1
C
D
E
3.500 BSC
7.000 BSC
3.500 BSC
S1
T, U, Z
1.400
1.600
0.270
1.450
0.230
S
0.170
1.350
0.170
DETAIL Y
4X
F
G
0.200 AC T–U
Z
0.500 BSC
H
J
K
L
M
N
0.050
0.090
0.500
1°
0.150
0.200
0.700
5°
0.080 AC
12° REF
G
AB
AC
0.090
0.160
P
0.250 BSC
R
0.150
0.250
S
9.000 BSC
S1
V
V1
W
AA
4.500 BSC
9.000 BSC
4.500 BSC
0.200 REF
1.000 REF
AD
M°
BASE METAL
TOP & BOTTOM
R
N
J
E
C
H
F
D
M
0.080
AC T–U Z
SECTION AE–AE
W
L°
K
DETAIL AD
AA
Figure 19-5. 48-Pin LQFP (Case #932)
Technical Data
214
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
Mechanical Specifications
MOTOROLA
Technical Data – MC68H(R)C908JL3E/JK3E/JK1E
Section 20. Ordering Information
20.1 Contents
20.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .215
20.3 MC Order Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .216
20.2 Introduction
This section contains ordering numbers for the MC68H(R)C908JL3E,
MC68H(R)C908JK3E, and MC68H(R)C908JK1E.
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
Technical Data
215
MOTOROLA
Ordering Information
Ordering Information
20.3 MC Order Numbers
Table 20-1. MC Order Numbers
MC order number
Oscillator type
FLASH memory
Package
MC68HC908JL3ECFA
MC68HC908JL3EMFA
Crystal oscillator
4096 Bytes
48-pin LQFP
MC68HRC98JL3ECFA
MC68HRC98JL3EMFA
RC oscillator
MC68HC908JL3ECP
MC68HC908JL3EMP
MC68HC908JL3ECDW
MC68HC908JL3EMDW
Crystal oscillator
4096 Bytes
4096 Bytes
1536 Bytes
28-pin package
MC68HRC98JL3ECP
MC68HRC98JL3EMP
MC68HRC98JL3ECDW
MC68HRC98JL3EMDW
RC oscillator
Crystal oscillator
RC oscillator
MC68HC908JK3ECP
MC68HC908JK3EMP
MC68HC908JK3ECDW
MC68HC908JK3EMDW
MC68HRC98JK3ECP
MC68HRC98JK3EMP
MC68HRC98JK3ECDW
MC68HRC98JK3EMDW
20-pin package
MC68HC908JK1ECP
MC68HC908JK1EMP
MC68HC908JK1ECDW
MC68HC908JK1EMDW
Crystal oscillator
RC oscillator
MC68HRC98JK1ECP
MC68HRC98JK1EMP
MC68HRC98JK1ECDW
MC68HRC98JK1EMDW
Notes:
C = –40 °C to +85 °C
M = –40 °C to +125 °C (available for VDD = 5V only)
P = Plastic dual in-line package (PDIP)
DW = Small outline integrated circuit package (SOIC)
FA = Low-Profile Quad Flat Pack (LQFP)
Technical Data
216
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
Ordering Information
MOTOROLA
Technical Data – MC68H(R)C908JL3E/JK3E/JK1E
Appendix A. MC68HLC908JL3E/JK3E/JK1E
A.1 Contents
A.2
A.3
A.4
A.5
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .217
FLASH Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218
Low-Voltage Inhibit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218
Oscillator Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218
A.6
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218
Functional Operating Range . . . . . . . . . . . . . . . . . . . . . . .218
DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . .219
Control Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .220
Oscillator Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . .220
ADC Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .221
Memory Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . .222
A.6.1
A.6.2
A.6.3
A.6.4
A.6.5
A.6.6
A.7
MC Order Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .223
A.2 Introduction
This appendix introduces three devices, that are low-voltage versions of
MC68HC908JL3E/JK3E/JK1E:
•
•
•
MC68HLC908JL3E
MC68HLC908JK3E
MC68HLC908JK1E
The entire data book apply to these low-voltage devices, with exceptions
outlined in this appendix.
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA MC68HLC908JL3E/JK3E/JK1E
Technical Data
217
MC68HLC908JL3E/JK3E/JK1E
A.3 FLASH Memory
The FLASH memory can be read at minimum VDD of 2.2V.
Program or erase operations require a minimum VDD of 2.7V.
A.4 Low-Voltage Inhibit
There is no low-voltage inhibit circuit. Therefore, no low-voltage reset.
The associated register bits are reserved bits.
A.5 Oscillator Options
Only crystal oscillator or direct clock input is supported.
A.6 Electrical Specifications
Electrical specifications for low-voltage devices are given in the following
tables.
A.6.1 Functional Operating Range
Table A-1. Operating Range
Characteristic
Symbol
Value
Unit
°C
TA
Operating temperature range
Operating voltage range
0 to +85
2.2 to 5.5
VDD
VDD
V
Operating voltage for FLASH memory
program and erase operations
2.7 to 5.5
V
Technical Data
218
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MC68HLC908JL3E/JK3E/JK1E MOTOROLA
MC68HLC908JL3E/JK3E/JK1E
A.6.2 DC Electrical Characteristics
Table A-2. DC Electrical Characteristics
Characteristic(1)
Typ(2)
Symbol
Min
Max
Unit
Output high voltage (ILOAD = –1.0mA)
PTA0–PTA6, PTB0–PTB7, PTD0–PTD7
VOH
VDD– 0.4
—
—
V
Output low voltage (ILOAD = 0.8mA)
VOL
VOL
—
—
—
—
0.4
0.5
V
V
PTA6, PTB0–PTB7, PTD0, PTD1, PTD4, PTD5
Output low voltage (ILOAD = 15mA)
PTD6, PTD7
Input high voltage
VIH
0.7 × VDD
VDD
PTA0–PTA6, PTB0–PTB7, PTD0–PTD7,
RST, IRQ1, OSC1
—
—
V
V
Input low voltage
VIL
VSS
0.2 × VDD
PTA0–PTA6, PTB0–PTB7, PTD0–PTD7,
RST, IRQ1, OSC1
VDD supply current (VDD = 2.4V, fOP = 2MHz)
Run(3)
—
—
—
2
1
1
3.5
1.5
3
mA
mA
µA
IDD
Wait(4)
Stop(5) 0°C to 85°C
IIL
Digital I/O ports Hi-Z leakage current
Input current
—
—
—
—
10
1
µA
µA
IIN
COUT
CIN
Capacitance
—
—
—
—
12
8
pF
Ports (as input or output)
POR rearm voltage(6)
VPOR
RPOR
0
—
—
100
mV
POR rise time ramp rate(7)
0.02
—
V/ms
Pullup resistors(8)
PTD6, PTD7
RPU1
RPU2
1.8
16
3.3
26
4.8
36
kΩ
kΩ
RST, IRQ1, PTA0–PTA6
NOTES:
1. VDD = 2.4 Vdc, VSS = 0 Vdc, TA = TL to TH, unless otherwise noted.
2. Typical values reflect average measurements at midpoint of voltage range, 25 °C only.
3. Run (operating) IDD measured using external square wave clock source. All inputs 0.2 V from rail. No dc loads. Less
than 100 pF on all outputs. CL = 20 pF on OSC2. All ports configured as inputs. OSC2 capacitance linearly affects run
IDD. Measured with all modules enabled.
4. Wait IDD measured using external square wave clock source; all inputs 0.2 V from rail; no dc loads; less than 100 pF
on all outputs. CL = 20 pF on OSC2; all ports configured as inputs; OSC2 capacitance linearly affects wait IDD
5. STOP IDD measured with OSC1 grounded, no port pins sourcing current. LVI is disabled.
6. Maximum is highest voltage that POR is guaranteed.
.
7. If minimum VDD is not reached before the internal POR reset is released, RST must be driven low externally until min-
imum VDD is reached.
8. RPU1 and RPU2 are measured at VDD = 5.0V
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA MC68HLC908JL3E/JK3E/JK1E
Technical Data
219
MC68HLC908JL3E/JK3E/JK1E
A.6.3 Control Timing
Table A-3. Control Timing
Characteristic(1)
Internal operating frequency(2)
Symbol
fOP
Min
—
Max
2
Unit
MHz
µs
RST input pulse width low(3)
tIRL
1.5
—
NOTES:
1. VDD = 2.2 Vdc, VSS = 0 Vdc, TA = TL to TH; timing shown with respect to 20% VDD and 70% VDD, unless otherwise noted.
2. Some modules may require a minimum frequency greater than dc for proper operation; see appropriate table for this infor-
mation.
3. Minimum pulse width reset is guaranteed to be recognized. It is possible for a smaller pulse width to cause a reset.
A.6.4 Oscillator Characteristics
Table A-4. Oscillator Component Specifications
Characteristic
Symbol
Min
Typ
Max
Unit
fOSCXCLK
Crystal frequency, XTALCLK
—
—
8
MHz
External clock
reference frequency(1)
fOSCXCLK
dc
—
8
MHz
Crystal load capacitance(2)
Crystal fixed capacitance(2)
CL
C1
C2
RB
RS
—
—
—
—
—
—
—
—
—
—
—
2 × CL
2 × CL
10 MΩ
—
Crystal tuning capacitance(2)
Feedback bias resistor
Series resistor(2), (3)
NOTES:
1. No more than 10% duty cycle deviation from 50%
2. Consult crystal vendor data sheet
3. Not Required for high frequency crystals
Technical Data
220
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MC68HLC908JL3E/JK3E/JK1E MOTOROLA
MC68HLC908JL3E/JK3E/JK1E
A.6.5 ADC Characteristics
Table A-5. ADC Characteristics
Characteristic
Symbol
Min
Max
Unit
Comments
2.2
(VDD min)
5.5
(VDD max)
VDDAD
Supply voltage
V
VADIN
BAD
VSS
8
VDD
8
Input voltages
Resolution
V
Bits
LSB
AAD
Absolute accuracy
0.5
2
Includes quantization
tAIC = 1/fADIC, tested
only at 1 MHz
fADIC
ADC internal clock
0.5
1.048
MHz
RAD
tADPU
tADC
tADS
ZADI
FADI
CADI
VSS
14
14
5
VDD
—
Conversion range
Power-up time
V
t
t
t
AIC cycles
AIC cycles
AIC cycles
Conversion time
Sample time(1)
15
—
Zero input reading(2)
Full-scale reading(3)
Input capacitance
00
FE
—
01
Hex
Hex
pF
V
IN = VSS
IN = VDD
Not tested
V
FF
(20) 8
Input leakage(3)
Port B/port D
—
—
1
µA
NOTES:
1. Source impedances greater than 10 kΩ adversely affect internal RC charging time during input sampling.
2. Zero-input/full-scale reading requires sufficient decoupling measures for accurate conversions.
3. The external system error caused by input leakage current is approximately equal to the product of R source and input
current.
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA MC68HLC908JL3E/JK3E/JK1E
Technical Data
221
MC68HLC908JL3E/JK3E/JK1E
A.6.6 Memory Characteristics
The FLASH memory can only be read at an operating voltage of 2.2 to
5.5V. Program and erase are achieved at an operating voltage of 2.7 to
5.5V. The program and erase parameters in Table A-6 are for
VDD = 2.7 to 5.5V only.
Table A-6. Memory Characteristics
Characteristic
RAM data retention voltage
Symbol
Min
1.3
1
Max
—
Unit
V
VRDR
FLASH program bus clock frequency
FLASH read bus clock frequency
—
—
MHz
Hz
(1)
32k
8M
fRead
(2)
FLASH page erase time
1
—
ms
tErase
(3)
FLASH mass erase time
4
10
5
—
—
—
—
—
40
—
ms
µs
µs
µs
µs
µs
µs
tMErase
tnvs
tnvh
tnvhl
tpgs
FLASH PGM/ERASE to HVEN set up time
FLASH high-voltage hold time
FLASH high-voltage hold time (mass erase)
FLASH program hold time
100
5
tPROG
FLASH program time
30
1
(4)
FLASH return to read time
trcv
(5)
FLASH cumulative program hv period
—
4
ms
tHV
FLASH row erase endurance(6)
FLASH row program endurance(7)
FLASH data retention time(8)
NOTES:
—
—
—
10k
10k
10
—
—
—
cycles
cycles
years
1. fRead is defined as the frequency range for which the FLASH memory can be read.
2. If the page erase time is longer than tErase (Min), there is no erase-disturb, but it reduces the endurance of the
FLASH memory.
3. If the mass erase time is longer than tMErase (Min), there is no erase-disturb, but it reduces the endurance of
the FLASH memory.
4. trcv is defined as the time it needs before the FLASH can be read after turning off the high voltage charge pump,
by clearing HVEN to logic 0.
5. tHV is defined as the cumulative high voltage programming time to the same row before next erase.
tHV must satisfy this condition: tnvs + tnvh + tpgs + (tPROG × 32) ≤ tHV max.
6. The minimum row endurance value specifies each row of the FLASH memory is guaranteed to work for at least
this many erase / program cycles.
7. The minimum row endurance value specifies each row of the FLASH memory is guaranteed to work for at least
this many erase / program cycles.
8. The FLASH is guaranteed to retain data over the entire operating temperature range for at least the minimum
time specified.
Technical Data
222
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MC68HLC908JL3E/JK3E/JK1E MOTOROLA
MC68HLC908JL3E/JK3E/JK1E
A.7 MC Order Numbers
Table A-7 shows the ordering numbers for the low-voltage devices.
Table A-7. MC68HLC908JL3E/JK3E/JK1E Order Numbers
MC order number
Oscillator type
FLASH memory
Package
MC68HLC98JL3EIFA
Crystal oscillator
4096 Bytes
48-pin LQFP
MC68HLC98JL3EIP
MC68HLC98JL3EIDW
Crystal oscillator
Crystal oscillator
Crystal oscillator
4096 Bytes
4096 Bytes
1536 Bytes
28-pin package
20-pin package
MC68HLC98JK3EIP
MC68HLC98JK3EIDW
MC68HLC98JK1EIP
MC68HLC98JK1EIDW
Notes:
I = 0 °C to +85 °C
P = Plastic dual in-line package (PDIP)
DW = Small outline integrated circuit package (SOIC)
FA = Low-Profile Quad Flat Pack (LQFP)
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA MC68HLC908JL3E/JK3E/JK1E
Technical Data
223
MC68HLC908JL3E/JK3E/JK1E
Technical Data
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
224
MC68HLC908JL3E/JK3E/JK1E
MOTOROLA
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© Motorola, Inc. 2002
MC68HC908JL3E/D
Rev. 2.0
12/2002
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