ST6232BQ1 [STMICROELECTRONICS]
8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, 16-BIT AUTO-RELOAD TIMER, EEPROM, SPI AND UART; 8位OTP / EPROM微控制器与A / D转换器， 16位自动重加载定时器， EEPROM ， SPI和UART
| 型号： | ST6232BQ1 |
| 厂家： | 
ST |
| 描述： | 8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, 16-BIT AUTO-RELOAD TIMER, EEPROM, SPI AND UART |
| 文件： | 总86页 (文件大小：582K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ST62T32B
ST62E32B
8-BIT OTP/EPROM MCUs WITH A/D CONVERTER,
16-BIT AUTO-RELOAD TIMER, EEPROM, SPI AND UART
■ 3.0 to 6.0V Supply Operating Range
■ 8 MHz Maximum Clock Frequency
■
-40 to +125°C Operating Temperature Range
■
Run, Wait and Stop Modes
■ 5 Interrupt Vectors
■ Look-up Table capability in Program Memory
■
Data Storage in Program Memory:
User selectable size
■ Data RAM: 192 bytes
■ Data EEPROM: 128 bytes
PSDIP42
■
User Programmable Options
■ 30 I/O pins, fully programmable as:
– Input with pull-up resistor
– Input without pull-up resistor
– Input with interrupt generation
– Open-drain or push-pull output
– Analog Input
■ 9 I/O lines can sink up to 20mA to drive LEDs or
TRIACs directly
PQFP52
■
8-bit Timer/Counter with 7-bit programmable
prescaler
■ 16-bit
Auto-reload
Timer
with
7-bit
programmable prescaler (AR Timer)
■
Digital Watchdog
■ 8-bit A/D Converter with 21 analog inputs
■ 8-bit Synchronous Peripheral Interface (SPI)
■
8-bit Asynchronous Peripheral Interface
(UART)
■ On-chip Clock oscillator can be driven by Quartz
CDIP42W
Crystal or Ceramic resonator
■
Oscillator Safe Guard
(See end of Datasheet for Ordering Information)
■
One external Non-Maskable Interrupt
■ ST623x-EMU2 Emulation and Development
System (connects to an MS-DOS PC via a
parallel port).
DEVICE SUMMARY
OTP
(Bytes)
EPROM
(Bytes)
DEVICE
I/O Pins
ST62T32B
ST62E32B
7948
-
30
30
7948
Rev. 2.5
September 1998
1/86
105
Table of Contents
Document
Page
ST62T32B/ST62E32B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1 GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1.2 PIN DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
1.3 MEMORY MAP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
1.3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
1.3.2 Program Space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
1.3.3 Data Space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
1.3.4 Stack Space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
1.3.5 Data Window Register (DWR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.3.6 Data RAM/EEPROM Bank Register (DRBR). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.3.7 EEPROM Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
1.4 PROGRAMMING MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
1.4.1 Option Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
1.4.2 Program Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
1.4.3 EEPROM Data Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
1.4.4 EPROM Erasing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
2 CENTRAL PROCESSING UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
2.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
2.2 CPU REGISTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
3 CLOCKS, RESET, INTERRUPTS AND POWER SAVING MODES . . . . . . . . . . . . . . . . . . . . . 18
3.1 CLOCK SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
3.1.1 Main Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
3.1.2 Low Frequency Auxiliary Oscillator (LFAO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.1.3 Oscillator Safe Guard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
3.2 RESETS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
3.2.1 RESET Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
3.2.2 Power-on Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
3.2.3 Watchdog Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
3.2.4 Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
3.2.5 MCU Initialization Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.3 DIGITAL WATCHDOG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
3.3.1 Digital Watchdog Register (DWDR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.3.2 Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
3.4 INTERRUPTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
3.4.1 Interrupt request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
3.4.2 Interrupt Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
3.4.3 Interrupt Option Register (IOR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.4.4 IInterrupt sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
3.5 POWER SAVING MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
3.5.1 WAIT Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
3.5.2 STOP Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
3.5.3 Exit from WAIT and STOP Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
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4 ON-CHIP PERIPHERALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
4.1 I/O PORTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
4.1.1 Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
4.1.2 Safe I/O State Switching Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
4.1.3 ARTimer alternate functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
4.1.4 SPI alternate functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
4.1.5 UART alternate functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
4.1.6 I/O Port Option Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
4.1.7 I/O Port Data Direction Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.1.8 I/O Port Data Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
4.2 TIMER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
4.2.1 Timer Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
4.2.2 Timer Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
4.2.3 Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
4.2.4 Timer Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
4.3 ARTIMER 16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
4.3.1 CENTRAL COUNTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
4.3.2 SIGNAL GENERATION MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
4.3.3 TIMINGS MEASUREMENT MODES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
4.3.4 INTERRUPT CAPABILITIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
4.3.5 CONTROL REGISTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
4.3.6 16-BIT REGISTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
4.4 A/D CONVERTER (ADC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
4.4.1 Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
4.5 U. A. R. T. (UNIVERSAL ASYNCHRONOUS RECEIVER/TRANSMITTER). . . . . . . . . . . 59
4.5.1 PORTS INTERFACING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
4.5.2 CLOCK GENERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
4.5.3 DATA TRANSMISSION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
4.5.4 DATA RECEPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
4.5.5 INTERRUPT CAPABILITIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
4.5.6 REGISTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
4.6 SERIAL PERIPHERAL INTERFACE (SPI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
5 SOFTWARE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
5.1 ST6 ARCHITECTURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
5.2 ADDRESSING MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
5.3 INSTRUCTION SET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
6 ELECTRICAL CHARACTERISTICS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
6.1 ABSOLUTE MAXIMUM RATINGS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
6.2 RECOMMENDED OPERATING CONDITIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
6.3 DC ELECTRICAL CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
6.4 AC ELECTRICAL CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
6.5 A/D CONVERTER CHARACTERISTICS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
6.6 TIMER CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
6.7 .SPI CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
6.8 ARTIMER16 ELECTRICAL CHARACTERISTICS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
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7 GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76
7.1 PACKAGE MECHANICAL DATA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76
7.2 ORDERING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78
ST62P32B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
1 GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
1.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
1.2 ORDERING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
1.2.1 Transfer of Customer Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
1.2.2 Listing Generation and Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
ST6232B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83
1 GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84
1.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84
1.2 ROM READOUT PROTECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84
1.3 ORDERING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86
1.3.1 Transfer of Customer Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
1.3.2 Listing Generation and Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
86
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ST62T32B ST62E32B
1 GENERAL DESCRIPTION
1.1 INTRODUCTION
The ST62T32B and ST62E32B devices are low
cost members of the ST62xx 8-bit HCMOS family
of microcontrollers, which is targeted at low to me-
dium complexity applications. All ST62xx devices
are based on a building block approach: a com-
mon core is surrounded by a number of on-chip
peripherals.
The ST62E32B is the erasable EPROM version of
the ST62T32B device, which may be used to em-
ulate the ST62T32B device, as well as the respec-
tive ST6232B ROM devices.
Figure 1. Block Diagram
PA0..PA1 / 20 mA Sink
PA2/OVF/ 20 mA Sink
PA3/PWM/20 mA Sink
PA4/Ain/CP1
PA5/Ain/CP2
PA6...PA7/Ain
PORT A
8-BIT
A/D CONVERTER
TEST/V
NMI
PP
TEST
PB0/Ain
PB3..PB7/Ain
PORT B
INTERRUPT
DATA ROM
USER
SELECTABLE
PC5..PC7/Ain
PORT C
PROGRAM
Memory
PD0,PD6,PD7/Ain
PD1/Ain/Scl
PD2/Ain/Sin
PD3/Ain/Sout
PD4/Ain/RXD1
PD5/Ain/TXD1
DATA RAM
192 Bytes
7948 bytes
PORT D
UART
DATA EEPROM
128 Bytes
PORT E
PE0...PE4
TIMER
AUTORELOAD
TIMER
PC
STACK LEVEL 1
STACK LEVEL 2
STACK LEVEL 3
STACK LEVEL 4
STACK LEVEL 5
STACK LEVEL 6
TIMER
8 BIT CORE
SPI (SERIAL
PERIPHERAL
INTERFACE)
DIGITAL
WATCHDOG
POWER
RESET
RESET
OSCILLATOR
SUPPLY
V
V
OSCin OSCout
DD SS
VR01823E
(VPP on EPROM/OTP versions only)
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ST62T32B ST62E32B
INTRODUCTION(Cont’d)
OTP and EPROM devices are functionally identi-
cal. The ROM based versions offer the same func-
tionality selecting as ROM options the options de-
fined in the programmable option byte of the
OTP/EPROM versions.OTP devices offer all the
advantages of user programmability at low cost,
which make them the ideal choice in a wide range
of applications where frequent code changes, mul-
tiple code versions or last minute programmability
are required.
These compact low-cost devices feature a Timer
comprising an 8-bit counter and a 7-bit program-
mable prescaler, an 16-bit Auto-Reload Timer,
with 2 input capture channels, EEPROM data ca-
pability, a serial synchronous port communication
interface (SPI), a serial asynchronous port inter-
face (UART), an 8-bit A/D Converter with 21 ana-
log inputs and a Digital Watchdog timer, making
them well suited for a wide range of automotive,
appliance and industrial applications.
Figure 2. ST62T32B/E32B Pin Configuration
Figure 3. ST62T32B Pin Configuration
PE4
PE3
1
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
PA0
2
PA1
PE2
3
PA2/OVF
PA3/PWM
PA4/Ain/CP1
PA5/Ain/CP2
PA6/Ain
PA7/Ain
TIMER
PE1
4
PE0
5
OSCin
OSCout
Ain/CP7
Ain/PC6
Ain/PC5
6
52515049484746454443424140
1
2
3
4
5
6
7
8
NC
OSCin
OSCout
Ain/PC7
Ain/PC6
Ain/PC5
NC
39
38 PA5/Ain/CP2
PA4/Ain/CP1
7
8
37
36
35
34
33
32
31
30
29
28
27
PA6/Ain
PA7/Ain
TIMER
NMI
9
10
11
12
13
14
15
16
17
18
19
20
21
NMI
V
AV
SSp
AV
AV
DD
SS
SS
V
V
SSP
AV
DDp
DD
V
9
PD0/Ain
DDP
V
PD0/Ain
SS
V
10
11
12
13
PD1/Ain/SCL
PD2/Ain/Sin
PD3/Ain/Sout
NC
SS
V
V
DD
PD1/Ain/SCL
PD2/Ain/Sin
PD3/Ain/Sout
PD4/Ain/RXD1
PD5/Ain/TXD1
PD6/Ain
DD
(1)
TEST/V
PP
TEST/V (1)
PP
RESET
RESET
Ain/PB7
Ain/PB6
Ain/PB5
Ain/PB4
Ain/PB3
26
141516171819202122232425
PD7/Ain
PB0/Ain
1. V on EPROM/OTP only
1. V on EPROM/OTP only
PP
VR01375G
PP
VR02008A
6/86
110
ST62T32B ST62E32B
1.2 PIN DESCRIPTIONS
and V
V
. Power is supplied to the MCU via
SS
In addition, PA4-PA5 can also be used as analog
inputs for the A/D converter while PA0-PA3 can
sink 20mA for direct LED or TRIAC drive.
DD
these two pins. V is the power connection and
DD
V
is the ground connection.
SS
V
and V
.
Power is supplied to the MCU
SSp
PB0,PB3-PB7
These 6 lines are organised as one
DDp
I/Os independently from the rest of the chip using
these two pins. These pins have to be connected
to the VDD and VSS pins. It is not allowed to leave
any of these pins unconnected or to apply different
I/O port (B). Each line may be configured under
software control as inputs with or without internal
pull-up resistors, interrupt generating inputs with
pull-up resistors, open-drain or push-pull outputs,
analog inputs for the A/D converter.
potentials respectively to V /V
and V /V
.
DD DDp
SS SSp
AV
and AV .
PC5-PC7
. These 3 lines are organised as one I/O
Power is supplied to the
DD
SS
MCUA/D converter independently from the rest of
the chip using these two pins.
port (C). Each line may be configured under soft-
ware control as input with or without internal pull-
up resistor, interrupt generating input with pull-up
resistor, analog input for the A/D converter, open-
drain or push-pull output.
OSCin and OSCout. These pins are internally
connected to the on-chip oscillator circuit. A quartz
crystal, a ceramic resonator or an external clock
signal can be connected between these two pins.
The OSCin pin is the input pin, the OSCout pin is
the output pin.
PD0-PD7. These 8 lines are organised as one I/O
port (portD). Each line may be configured under
software control as input with or without internal
pull-up resistor, interrupt generating input with
pull-up resistor, analog input open-drain or push-
pull output. In adition, the pins PD5/TXD1 and
PD4/RXD1 can be used as UART output
(PD5/TXD1) or UART input (PD4/RXD1). The pins
PD3/Sout, PD2/Sin and PD1/SCL can also be
used respectively as data out, data in and Clock
pins for the on-chip SPI.
RESET
start the microcontroller.
. The active-low RESET pin is used to re-
TEST/VPP. The TEST must be held at V for nor-
SS
mal operation. If TEST pin is connected to a
+12.5V level during the reset phase, the
EPROM/OTP programming Mode is entered.
NMI.
The NMI pin provides the capability for asyn-
chronous interruption, by applying an external non
maskable interrupt to the MCU.The NMI input is
falling edge sensitive with Schmitt trigger charac-
teristics. The user can select as option the availa-
bility of an on-chip pull-up at this pin.
PE0-PE4. These 5 lines are organised as one I/O
port (PE). Each line may be configured under soft-
ware control as input with or without internal pull-
up resistor, interrupt generation input with pull-up
resistor, open-drain or push-pull output. In output
mode, these lines can also sink 20mA for direct
LED and TRIAC driving.
PA0-PA7. These 8 lines are organised as one I/O
port (A). Each line may be configured under soft-
ware control as inputs with or without internal pull-
up resistors, interrupt generating inputs with pull-
up resistors, open-drain or push-pull outputs.
PA2/OVF, PA3/PWM, PA4/CP1 and PA5/CP2 can
be used respectively as overflow output pin, output
compare pin, and as two input capture pins for the
embedded 16-bit Auto-Reload Timer.
TIMER. This is the TIMER 1 I/O pin. In input mode,
it is connected to the prescaler and acts as ex-
ternal timer clock or as control gate for the internal
timer clock. In output mode, the TIMER pin outputs
the data bit when a time-out occurs.The user can
select as option the availability of an on-chip pull-
up at this pin.
7/86
111
ST62T32B ST62E32B
1.3 MEMORY MAP
1.3.1 Introduction
common (STATIC) 2K page is available all the
time for interrupt vectors and common subrou-
tines, independently of the PRPR register content.
This “STATIC” page is directly addressed in the
0800h-0FFFh by the MSB of the Program Counter
register PC 11. Note this page can also be ad-
dressed in the 000-7FFh range. It is two different
ways of addressing the same physical memory.
The MCU operates in three separate memory
spaces: Program space, Data space, and Stack
space. Operation in these three memory spaces is
described in the following paragraphs.
Briefly, Program space contains user program
code in Program memory and user vectors; Data
space contains user data in RAM and in Program
memory, and Stack space accommodates six lev-
els of stack for subroutine and interrupt service
routine nesting.
Jump from a dynamic page to another dynamic
page is achieved by jumping back to the static
page, changing contents of PRPR and then jump-
ing to the new dynamic page.
1.3.2 Program Space
Figure 4. 8Kbytes Program Space Addressing
Program Space comprises the instructions to be
executed, the data required for immediate ad-
dressing mode instructions, the reserved factory
test area and the user vectors. Program Space is
addressed via the 12-bit Program Counter register
(PC register).
ROM SPACE
PC
1FFFh
Page 3
SPACE
000h
0000h
Page 1
Static
Page
Page 0
Page 2
7FFh
800h
Program Space is organised in four 2K pages.
Three of them are addressed in the 000h-7FFh lo-
cations of the Program Space by the Program
Counter and by writing the appropriate code in the
Program ROM Page Register (PRPR register). A
Page 1
Static
Page
FFFh
Figure 5. Memory Addressing Diagram
PROGRAM SPACE
DATA SPACE
0000h
000h
RAM / EEPROM
BANKING AREA
0-63
03Fh
040h
DATA READ-ONLY
WINDOW
MEMORY
PROGRAM
MEMORY
07Fh
080h
081h
082h
083h
084h
X REGISTER
Y REGISTER
V REGISTER
W REGISTER
RAM
DATA READ-ONLY
MEMORY
WINDOW SELECT
0C0h
0FF0h
DATA RAM
INTERRUPT &
RESET VECTORS
0FFFh
BANK SELECT
ACCUMULATOR
0FFh
VR01568
8/86
112
ST62T32B ST62E32B
MEMORY MAP (Cont’d)
Table 1. ST62E32B/T32B Program Memory Map
Program ROM Page Register (PRPR)
Address: CAh
7
— Write Only
ROM Page Device Address
Description
0000h-007Fh
Page 0
Reserved
User ROM
0
0080h-07FFh
-
-
-
-
-
-
PRPR0 PRPR1
0800h-0F9Fh
0FA0h-0FEFh
User ROM
Reserved
Page 1
“STATIC”
0FF0h-0FF7h
0FF8h-0FFBh
0FFCh-0FFDh
0FFEh-0FFFh
Interrupt Vectors
Reserved
NMI Vector
Reset Vector
Bits 2-7= Not used.
Bit 5-0 = PRPR1-PRPR0: Program ROM Select.
These two bits select the corresponding page to
be addressed in the lower part of the 4K program
address space as specified inTable 2.
0000h-000Fh
0010h-07FFh
Reserved
User ROM
Page 2
Page 3
0000h-000Fh
0010h-07FFh
Reserved
User ROM
This register is undefined on Reset. Neither read
nor single bit instructions may be used to address
this register.
Note: OTP/EPROM devices can be programmed
with the development tools available from STMicro-
electronics (ST62E3X-EPB or ST623X-KIT).
Table 2. 8Kbytes Program ROM Page Register
Coding
PRPR1
PRPR0 PC bit 11
Memory Page
Static Page (Page 1)
Page 0
X
0
0
1
1
X
0
1
0
1
1
0
0
0
0
1.3.2.1 Program ROM Page Register (PRPR)
The PRPR register can be addressed like a RAM
location in the Data Space at the address CAh ;
nevertheless it is a write only register that cannot
be accessed with single-bit operations. This regis-
ter is used to select the 2-Kbyte ROM bank of the
Program Space that will be addressed. The
number of the page has to be loaded in the PRPR
register. Refer to the Program Space description
for additional information concerning the use of
this register. The PRPR register is not modified
when an interrupt or a subroutine occurs.
Page 1 (Static Page
Page 2
Page 3
1.3.2.2 Program Memory Protection
The Program Memory in OTP or EPROM devices
can be protected against external readout of mem-
ory by selecting the READOUT PROTECTION op-
tion in the option byte.
In the EPROM parts, READOUT PROTECTION
option can be disactivated only by U.V. erasure
that also results into the whole EPROM context
erasure.
Care is required when handling the PRPR register
as it is write only. For this reason, it is not allowed
to change the PRPR contents while executing in-
terrupt service routine, as the service routine
cannot save and then restore its previous content.
This operation may be necessary if common rou-
tines and interrupt service routines take more than
2K bytes ; in this case it could be necessary to di-
vide the interrupt service routine into a (minor) part
in the static page (start and end) and to a second
(major) part in one of the dynamic pages. If it is im-
possible to avoid the writing of this register in inter-
rupt service routines, an image of this register
must be saved in a RAM location, and each time
the program writes to the PRPR it must write also
to the image register. The image register must be
written before PRPR, so if an interrpt occurs
between the two instructions the PRPR is not af-
fected.
Note: Once the Readout Protection is activated, it
is no longer possible, even for STMicroelectronics,
to gain access to the Program memory contents.
Returned parts with a protection set can therefore
not be accepted.
9/86
113
ST62T32B ST62E32B
MEMORY MAP (Cont’d)
1.3.3 Data Space
Table 4. ST62T32B/E32B Data Memory Space
000h
DATA and EEPROM
03Fh
Data Space accommodates all the data necessary
for processing the user program. This space com-
prises the RAM resource, the processor core and
peripheral registers, as well as read-only data
such as constants and look-up tables in Program
memory.
040h
DATAROM WINDOW AREA
07Fh
X REGISTER
Y REGISTER
V REGISTER
W REGISTER
080h
081h
082h
083h
1.3.3.1 Data ROM
084h
DATA RAM
0BFh
0C0h
0C1h
0C2h
0C3h
0C4h
0C5h
0C6h
0C7h
0C8h*
0C9h*
0CAh*
0CBh*
0CCh
0CDh
0CEh
0CFh
0D0h
0D1h
0D2h
0D3h
0D4h
0D5h
0D6h
0D7h
0D8h
0D9h
0DAh
0DBh
0DCh*
0DDh
0DEh
0DFh
0E0h
0E1h
0E2h
0E3h
0E8h
All read-only data is physically stored in program
memory, which also accommodates the Program
Space. The program memory consequently con-
tains the program code to be executed, as well as
the constants and look-up tables required by the
application.
PORT A DATAREGISTER
PORT B DATAREGISTER
PORT C DATAREGISTER
PORT D DATAREGISTER
PORT A DIRECTION REGISTER
PORT B DIRECTION REGISTER
PORT C DIRECTION REGISTER
PORT D DIRECTION REGISTER
INTERRUPT OPTION REGISTER
DATAROM WINDOW REGISTER
ROM BANK SELECT REGISTER
RAM/EEPROM BANK SELECT REGISTER
PORT A OPTION REGISTER
The Data Space locations in which the different
constants and look-up tables are addressed by the
processor core may be thought of as a 64-byte
window through which it is possible to access the
read-only data stored in Program memory.
1.3.3.2 Data RAM/EEPROM
PORT B OPTION REGISTER
PORT C OPTION REGISTER
PORT D OPTION REGISTER
A/D DATAREGISTER
A/D CONTROL REGISTER
In ST6232B and ST62E32B devices, the data
space includes 60 bytes of RAM, the accumulator
(A), the indirect registers (X), (Y), the short direct
registers (V), (W), the I/O port registers, the pe-
ripheral data and control registers, the interrupt
option register and the Data ROM Window register
(DRW register).
TIMER 1 PRESCALER REGISTER
TIMER 1 COUNTER REGISTER
TIMER 1 STATUS/CONTROL REGISTER
RESERVED
UART DATASHIFT REGISTER
UART STATUSCONTROL REGISTER
WATCHDOG REGISTER
Additional RAM and EEPROM pages can also be
addressed using banks of 64 bytes located
between addresses 00h and 3Fh.
RESERVED
1.3.4 Stack Space
I/O INTERRUPT POLARITY REGISTER
OSCILLATOR CONTROL REGISTER
SPI INTERRUPT DISABLE REGISTER
SPI DATAREGISTER
Stack space consists of six 12-bit registers which
are used to stack subroutine and interrupt return
addresses, as well as the current program counter
contents.
RESERVED
EEPROM CONTROL REGISTER
ARTIM16 COMPARE MASK REG. LOW BYTE MASK
ARTIM16 2ND STATUSCONTROL REGISTERSCR2
ARTIM16 3RD STATUSCONTROL REGISTERSCR3
ARTIM16 4TH STATUS CONTROL REGISTER SCR4
ARTIM16 1ST STATUSCONTROL REGISTER SCR1
Table 3. Additional RAM/EEPROM Banks.
Device
RAM
EEPROM
ST62T32B/E32B
2 x 64 bytes
2 x 64 bytes
ARTIM16 RELOAD CAPTURE REG. HIGH BYTE RLCP 0E9h
ARTIM16 RELOAD CAPTURE REG. LOW BYTE RLCP 0EAh
ARTIM16 CAPTURE REGISTER HIGH BYTE CP
ARTIM16 CAPTURE REGISTER LOW BYTE CP
0EBh
0ECh
ARTIM16 COMPAREVALUEREGISTERHIGHBYTECMP 0EDh
ARTIM16COMPAREVALUEREGISTERLOWBYTE CMP 0EEh
ARTIM 16 COMPARE MASK REG. HIGH BYTE MASK 0EFh
RESERVED
0F0h
0FBh
OFCh
0FDh
0FEh
OFFh
PORT E DATA REGISTER
PORT E DIRECTION REGISTER
PORT E OPTION REGISTER
ACCUMULATOR
* WRITE ONLY REGISTER
10/86
114
ST62T32B ST62E32B
MEMORY MAP (Cont’d)
1.3.5 Data Window Register (DWR)
Data Window Register (DWR)
Address: 0C9h
—
Write Only
The Data read-only memory window is located from
address 0040h to address 007Fh in Data space. It
allows direct reading of 64 consecutive bytes locat-
ed anywhere in program memory, between ad-
dress 0000h and 1FFFh (top memory address de-
pends on the specific device). All the program
memory can therefore be used to store either in-
structions or read-only data. Indeed, the window
can be moved in steps of 64 bytes along the pro-
gram memory by writing the appropriate code in the
Data Window Register (DWR).
7
0
-
DWR6 DWR5 DWR4 DWR3 DWR2 DWR1 DWR0
Bits 7 = Not used.
DWR5-DWR0:
Bit 6-0 =
Data read-only memory
Window Register Bits. These are the Data read-
only memory Window bits that correspond to the
upper bits of the data read-only memory space.
The DWR can be addressed like any RAM location
in the Data Space, it is however a write-only regis-
ter and therefore cannot be accessed using single-
bit operations. This register is used to position the
64-byte read-only data window (from address 40h
to address 7Fh of the Data space) in program
memory in 64-byte steps. The effective address of
the byte to be read as data in program memory is
obtained by concatenating the 6 least significant
bits of the register address given in the instruction
(as least significant bits) and the content of the
DWR register (as most significant bits), as illustrat-
ed in Figure 6below. For instance, when address-
ing location 0040h of the Data Space, with 0 load-
ed in the DWR register, the physical location ad-
dressed in program memory is 00h. The DWR reg-
ister is not cleared on reset, therefore it must be
written to prior to the first access to the Data read-
only memory window area.
Caution: This register is undefined on reset. Nei-
ther read nor single bit instructions may be used to
address this register.
Note:
Care is required when handling the DWR
register as it is write only. For this reason, the
DWR contents should not be changed while exe-
cuting an interrupt service routine, as the service
routine cannot save and then restore the register’s
previous contents. If it is impossible to avoid writ-
ing to the DWR during the interrupt service routine,
an image of the register must be saved in a RAM
location, and each time the program writes to the
DWR, it must also write to the image register. The
image register must be written first so that, if an in-
terrupt occurs between the two instructions, the
DWR is not affected.
Figure 6. Data read-only memory Window Memory Addressing
13 12 11 10
9
3
8
2
7
1
6
0
5
4
3
2
1
1
0
0
PROGRAM SPACE ADDRESS
READ
DATA ROM
WINDOW REGISTER
CONTENTS
7
6
5
4
5
4
3
2
DATA SPACE ADDRESS
40h-7Fh
(DWR)
0
1
IN INSTRUCTION
Example:
DWR=28h
0
0
0
0
0
0
0
0
0
1
1
1
1
DATA SPACE ADDRESS
59h
1
1
1
1
1
0
0
0
0
0
0
ROM
ADDRESS:A19h
1
0
0
1
VR0A1573
11/86
115
ST62T32B ST62E32B
MEMORY MAP (Cont’d)
1.3.6 Data RAM/EEPROM Bank Register
(DRBR)
point to the selected location as if it was in bank 0
(from 00h address to 3Fh address).
This register is not cleared during the MCU initiali-
zation, therefore it must be written before the first
access to the Data Space bank region. Refer to
the Data Space description for additional informa-
tion. The DRBR register is not modified when an
interrupt or a subroutine occurs.
Address: CBh
—
Write only
7
0
-
-
-
DRBR4 DRBR3
-
DRBR1 DRBR0
Notes :
Bit 7-5 = These bits are not used
Care is required when handling the DRBR register
as it is write only. For this reason, it is not allowed
to change the DRBR contents while executing in-
terrupt service routine, as the service routine can-
not save and then restore its previous content. If it
is impossible to avoid the writing of this register in
interrupt service routine, an image of this register
must be saved in a RAM location, and each time
the program writes to DRBR it must write also to
the image register. The image register must be
written first, so if an interrupt occurs between the
two instructions the DRBR is not affected.
Bit 4 - DRBR4. This bit, when set, selects RAM
Page 2.
Bit 3 - DRBR3. This bit, when set, selects RAM
Page 1.
Bit2. This bit is not used.
Bit 1 - DRBR1. This bit, when set, selects
EEPROM Page 1.
Bit 0 - DRBR0. This bit, when set, selects
EEPROM Page 0.
In DRBR Register, only 1 bit must be set. Other-
wise two or more pages are enabled in parallel,
producing errors.
The selection of the bank is made by programming
the Data RAM Bank Switch register (DRBR regis-
ter) located at address CBh of the Data Space ac-
cording to Table 1. No more than one bank should
be set at a time.
Table 5. Data RAM Bank Register Set-up
DRBR
00
ST62T32B/E32B
None
The DRBR register can be addressed like a RAM
Data Space at the address CBh; nevertheless it is
a write only register that cannot be accessed with
single-bit operations. This register is used to select
the desired 64-byte RAM/EEPROM bank of the
Data Space. The number of banks has to be load-
ed in the DRBR register and the instruction has to
01
EEPROM Page 0
EEPROM Page 1
RAM Page 1
RAM Page 2
Reserved
02
08
10h
other
12/86
116
ST62T32B ST62E32B
MEMORY MAP (Cont’d)
1.3.7 EEPROM Description
(PMODE). In BMODE, one byte is accessed at a
time, while in PMODE up to 8 bytes in the same
row are programmed simultaneously (with conse-
quent speed and power consumption advantages,
the latter being particularly important in battery
powered circuits).
EEPROM memory is located in 64-byte pages in
data space. This memory may be used by the user
program for non-volatile data storage.
Data space from 00h to 3Fh is paged as described
in Table 6. EEPROM locations are accessed di-
rectly by addressing these paged sections of data
space.
General Notes:
Data should be written directly to the intended ad-
dress in EEPROM space. There is no buffer mem-
ory between data RAM and the EEPROM space.
The EEPROM does not require dedicated instruc-
tions for read or write access. Onceselected via the
Data RAM Bank Register, the active EEPROM
page is controlled by the EEPROM Control Regis-
ter (EECTL), which is described below.
When the EEPROM is busy (E2BUSY = “1”)
EECTL cannot be accessed in write mode, it is
only possible to read the status of E2BUSY. This
implies that as long as the EEPROM is busy, it is
not possible to change the status of the EEPROM
Control Register. EECTL bits 4 and 5 are reserved
and must never be set.
Bit E20FF of the EECTL register must be reset prior
to any write or read access to the EEPROM. If no
bank has been selected, or if E2OFF is set, any ac-
cess is meaningless.
Care is required when dealing with the EECTL reg-
ister, as some bits are write only. For this reason,
the EECTL contents must not be altered while ex-
ecuting an interrupt service routine.
Programming must be enabled by setting the
E2ENA bit of the EECTL register.
The E2BUSY bit of the EECTL register is set when
the EEPROM is performing a programming cycle.
Any access to the EEPROM when E2BUSY is set
is meaningless.
If it is impossible to avoid writing to this register
within an interrupt service routine, an image of the
register must be saved in a RAM location, and
each time the program writes to EECTL it must
also write to the image register. The image register
must be written to first so that, if an interrupt oc-
curs between the two instructions, the EECTL will
not be affected.
Provided E2OFF and E2BUSY are reset, an EEP-
ROM location is read just like any other data loca-
tion, also in terms of access time.
Writing to the EEPROM may be carried out in two
modes: Byte Mode (BMODE) and Parallel Mode
Table 6. Row Arrangement for Parallel Writing of EEPROM Locations
Dataspace
addresses.
Banks 0 and 1.
Byte
0
1
2
3
4
5
6
7
ROW7
ROW6
ROW5
ROW4
ROW3
ROW2
ROW1
ROW0
38h-3Fh
30h-37h
28h-2Fh
20h-27h
18h-1Fh
10h-17h
08h-0Fh
00h-07h
Up to 8 bytes in each row may be programmed simultaneously in Parallel Write mode.
The number of available 64-byte banks (1 or 2) is device dependent.
13/86
117
ST62T32B ST62E32B
MEMORY MAP (Cont’d)
Additional Notes on Parallel Mode:
EEPROM Control Register (EECTL)
Address: DFh — Read/Write
Reset status: 00h
If the user wishes to perform parallel program-
ming, the first step should be to set the E2PAR2
bit. From this time on, the EEPROM will be ad-
dressed in write mode, the ROW address will be
latched and it will be possible to change it only at
the end of the programming cycle, or by resetting
E2PAR2 without programming the EEPROM. Af-
ter the ROW address is latched, the MCU can only
“see” the selected EEPROM row and any attempt
to write or read other rows will produce errors.
7
0
D7 E2OFF D5
D4 E2PAR1 E2PAR2 E2BUSY E2ENA
Bit 7 = D7: Unused.
Bit 6 =E2OFF: Stand-by Enable Bit.WRITE ONLY.
If this bitis settheEEPROM is disabled (any access
will be meaningless) and the power consumption of
the EEPROM is reduced to its lowest value.
The EEPROM should not be read while E2PAR2
is set.
As soon as the E2PAR2 bit is set, the 8 volatile
ROW latches are cleared. From this moment on,
the user can load data in all or in part of the ROW.
Setting E2PAR1 will modify the EEPROM regis-
ters corresponding to the ROW latches accessed
after E2PAR2. For example, if the software sets
E2PAR2 and accesses the EEPROM by writing to
addresses 18h, 1Ah and 1Bh, and then sets
E2PAR1, these three registers will be modified si-
multaneously; the remaining bytes in the row will
be unaffected.
Bit 5-4 = D5-D4: Reserved. MUST be kept reset.
E2PAR1
Bit 3 =
: Parallel Start Bit. WRITE ONLY.
Once inParallel Mode, as soonasthe usersoftware
sets the E2PAR1 bit, parallel writing of the 8 adja-
cent registers will start. This bit is internally reset at
the end of the programming procedure. Note that
less than 8 bytes can be written if required, the un-
defined bytes being unaffected by the parallel pro-
gramming cycle; this is explained in greater detail in
the Additional Notes on Parallel Mode overleaf.
Note that E2PAR2 is internally reset at the end of
the programming cycle. This implies that the user
must set the E2PAR2 bit between two parallel pro-
gramming cycles. Note that if the user tries to set
E2PAR1 while E2PAR2 is not set, there will be no
programming cycle and the E2PAR1 bit will be un-
affected. Consequently, the E2PAR1 bit cannot be
set if E2ENA is low. The E2PAR1 bit can be set by
the user, only if the E2ENA and E2PAR2 bits are
also set.
Bit 2 = E2PAR2: Parallel Mode En. Bit. WRITE
ONLY. This bit must be set by the user program in
order to perform parallel programming. If E2PAR2
is set and the parallel start bit (E2PAR1) is reset,
up to 8 adjacent bytes can be written simultane-
ously. These 8 adjacent bytes are considered as a
row, whose address lines A7, A6, A5, A4, A3 are
fixed while A2, A1 and A0 are the changing bits, as
illustrated in Table 6. E2PAR2 is automatically re-
set at the end of any parallel programming proce-
dure. It can be reset by the user software before
starting the programming procedure, thus leaving
the EEPROM registers unchanged.
Bit 1 = E2BUSY: EEPROM Busy Bit. READ ON-
LY. This bit is automatically set by the EEPROM
control logic when the EEPROM is in program-
ming mode. The user program should test it before
any EEPROM read or write operation; any attempt
to access the EEPROM while the busy bit is set
will be aborted and the writing procedure in
progress will be completed.
E2ENA
: EEPROM Enable Bit.WRITE ON-
Bit 0 =
LY. This bit enables programming of the EEPROM
cells. It must be set before any write to the EEP-
ROM register. Any attempt to write to the EEP-
ROM when E2ENA is low is meaningless and will
not trigger a write cycle.
14/86
118
ST62T32B ST62E32B
1.4 PROGRAMMING MODES
1.4.1 Option Byte
Bit 0 = OSGEN.This bit must be set high to enable
the oscillator Safe Guard. When this bit is low, the
OSG is disabled.
The Option Byte allows configuration capability to
the MCUs. Option byte’s content is automatically
read, and the selected options enabled, when the
chip reset is activated.
The Option byte is written during programming ei-
ther by using the PC menu (PC driven Mode) or
automatically (stand-alone mode)
It can only be accessed during the programming
mode. This access is made either automatically
(copy from a master device) or by selecting the
OPTION BYTE PROGRAMMING mode of the pro-
grammer.
1.4.2 Program Memory
EPROM/OTP programming mode is set by a
+12.5V voltage applied to the TEST/V pin. The
PP
programming flow of the ST62T32B/E32B is de-
scribed in the User Manual of the EPROM Pro-
gramming Board.
The option byte is located in a non-user map. No
address has to be specified.
The MCUs can be programmed with the
ST62E3xB EPROM programming tools available
from STMicroelectronics.
EPROM Code Option Byte
7
-
0
1.4.3 EEPROM Data Memory
PORT
PULL
TIM NMI
PULL PULL
EXTCNTL PROTECT
WDACT OSGEN
EEPROM data pages are supplied in the virgin
state FFh. Partial or total programming of EEP-
ROM data memory can be performed either
through the application software, or through an ex-
ternal programmer. Any STMicroelectronics tool
used for the program memory (OTP/EPROM) can
also be used to program the EEPROM data mem-
ory.
Bit 7. Reserved.
PORT PULL
have pull-up input state at reset on the I/O port.
When this bit is low, I/O ports are in input without
pull-up (high impedance) state at reset
Bit 6 =
. This bit must be set high to
1.4.4 EPROM Erasing
EXTCNTL
. This bit selects the External
Bit 5 =
STOP Mode capability. When EXTCNTL is high,
pin NMI controls if the STOP mode can be ac-
cessed when the watchdog is active. When EXTC-
NTL is low, the STOP instruction is processed as a
WAIT as soon as the watchdog is active.
The EPROM of the windowed package of the
MCUs may be erased by exposure to Ultra Violet
light. The erasure characteristic of the MCUs is
such that erasure begins when the memory is ex-
posed to light with a wave lengths shorter than ap-
proximately 4000Å. It should be noted that sun-
lights and some types of fluorescent lamps have
wavelengths in the range 3000-4000Å.
Bit 4 = PROTECT. This bit allows the protection of
the software contents against piracy. When the bit
PROTECT is set high, readout of the OTP con-
tents is prevented by hardware. No programming
equipment is able to gain access to the user pro-
gram. When this bit is low, the user program can
be read.
It is thus recommended that the window of the
MCUs packages be covered by an opaque label to
prevent unintentional erasure problems when test-
ing the application in such an environment.
Bit 3 = TIM PULL. This bit must be set high to con-
figure the TIMER pin with a pull up resistor. When
it is low, no pull up is provided.
The recommended erasure procedure of the
MCUs EPROM is the exposure to short wave ul-
traviolet light which have a wave-length 2537A.
The integrated dose (i.e. U.V. intensity x exposure
time) for erasure should be a minimum of 15W-
Bit 2 = NMI PULL. This bit must be set high to con-
figure the NMI pin with a pull up resistor when it is
low, no pull up is provided.
2
sec/cm . The erasure time with this dosage is ap-
proximately 15 to 20 minutes using an ultraviolet
2
Bit 1 = WDACT. This bit controls the watchdog ac-
tivation. When it is high, hardware activation is se-
lected. The software activation is selected when
WDACT is low.
lamp with 12000µW/cm power rating. The
ST62E32B should be placed within 2.5cm (1Inch)
of the lamp tubes during erasure.
15/86
119
ST62T32B ST62E32B
2 CENTRAL PROCESSING UNIT
2.1 INTRODUCTION
The CPUCore of ST6 devices is independent of the
I/O or Memory configuration. As such, it may be
thought of as an independent central processor
communicating with on-chip I/O, Memory and Pe-
ripherals via internal address, data, and control
buses. In-core communication is arranged as
shown in Figure 7; the controller being externally
linked to both the Reset and Oscillator circuits,
while the core is linked to the dedicated on-chip pe-
ripherals via the serial data bus and indirectly, for
interrupt purposes, through the control registers.
Indirect Registers (X, Y).These two indirect reg-
isters are used as pointers to memory locations in
Data space. They are used in the register-indirect
addressing mode. These registers can be ad-
dressed in the data space as RAM locations at ad-
dresses 80h (X) and 81h (Y). They can also be ac-
cessed with the direct, short direct, or bit direct ad-
dressing modes. Accordingly, the ST6 instruction
set can use the indirect registers as any other reg-
ister of the data space.
Short Direct Registers (V, W). These two regis-
ters are used to save a byte in short direct ad-
dressing mode. They can be addressed in Data
space as RAM locations at addresses 82h (V) and
83h (W). They can also be accessed using the di-
rect and bit direct addressing modes. Thus, the
ST6 instruction set can use the short direct regis-
ters as any other register of the data space.
2.2 CPU REGISTERS
The ST6Family CPUcore featuressixregisters and
three pairs of flags available to the programmer.
These are described in the following paragraphs.
Accumulator (A). The accumulator is an 8-bit
general purpose register used in all arithmetic cal-
culations, logical operations, and data manipula-
tions. The accumulator can be addressed in Data
space as a RAM location at address FFh. Thus the
ST6 can manipulate the accumulator just like any
other register in Data space.
Program Counter (PC). The program counter is a
12-bit register which contains the address of the
next ROM location to be processed by the core.
This ROM location may be an opcode, an oper-
and, or the address of an operand. The 12-bit
length allows the direct addressing of 4096 bytes
in Program space.
Figure 7. ST6 Core Block Diagram
0,01 TO 8MHz
RESET
OSCin
OSCout
INTERRUPTS
CONTROLLER
DATA SPACE
DATA
CONTROL
SIGNALS
FLAG
VALUES
OPCODE
ADDRESS/READ LINE
ADDRESS
2
RAM/EEPROM
PROGRAM
DATA
ROM/EPROM
256
ROM/EPROM
DECODER
B-DATA
A-DATA
DEDICATIONS
ACCUMULATOR
Program Counter
and
12
FLAGS
6 LAYER STACK
ALU
RESULTS TO DATA SPACE (WRITE LINE)
VR01811
16/86
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ST62T32B ST62E32B
CPU REGISTERS (Cont’d)
However, if the program space contains more than
4096 bytes, the additional memory in program
space can be addressed by using the Program
Bank Switch register.
automatically selected after the reset of the MCU,
the ST6 core uses at first the NMI flags.
Stack. The ST6 CPU includes a true LIFO hard-
ware stack which eliminates the need for a stack
pointer. The stack consists of six separate 12-bit
RAM locations that do not belong to the data
space RAM area. When a subroutine call (or inter-
rupt request) occurs, the contents of each level are
shifted into the next higher level, while the content
of the PC is shifted into the first level (the original
contents of the sixth stack level are lost). When a
subroutine or interrupt return occurs (RET or RETI
instructions), the first level register is shifted back
into the PC and the value of each level is popped
back into the previous level. Since the accumula-
tor, in common with all other data space registers,
is not stored in this stack, management of these
registers should be performed within the subrou-
tine. The stack will remain in its “deepest” position
if more than 6 nested calls or interrupts are execut-
ed, and consequently the last return address will
be lost. It will also remain in its highest position if
the stack is empty and a RET or RETI is executed.
In this case the next instruction will be executed.
The PC value is incremented after reading the ad-
dress of the current instruction. To execute relative
jumps, the PC and the offset are shifted through
the ALU, where they are added; the result is then
shifted back into the PC. The program counter can
be changed in the following ways:
- JP (Jump) instructionPC=Jump address
- CALL instructionPC= Call address
- Relative Branch Instruction.PC= PC +/- offset
- Interrupt
- Reset
PC=Interrupt vector
PC= Reset vector
- RET & RETI instructionsPC= Pop (stack)
- Normal instructionPC= PC + 1
Flags (C, Z). The ST6 CPU includes three pairs of
flags (Carry and Zero), each pair being associated
with one of the three normal modes of operation:
Normal mode, Interrupt mode and Non Maskable
Interrupt mode. Each pair consists of a CARRY
flag and a ZERO flag. One pair (CN, ZN) is used
during Normal operation, another pair is used dur-
ing Interrupt mode (CI, ZI), and a third pair is used
in the Non Maskable Interrupt mode (CNMI, ZN-
MI).
Figure 8. ST6 CPU Programming Mode
l
b7 X REG. POINTER b0
INDEX
REGISTER
SHORT
DIRECT
ADDRESSING
b7 Y REG. POINTER b0
The ST6 CPU uses the pair of flags associated
with the current mode: as soon as an interrupt (or
a Non Maskable Interrupt) is generated, the ST6
CPU uses the Interrupt flags (resp. the NMI flags)
instead of the Normal flags. When the RETI in-
struction is executed, the previously used set of
flags is restored. It should be noted that each flag
set can only be addressed in its own context (Non
Maskable Interrupt, Normal Interrupt or Main rou-
tine). The flags are not cleared during context
switching and thus retain their status.
MODE
b7
b7
V REGISTER
W REGISTER
b0
b0
b7 ACCUMULATOR
PROGRAM COUNTER
b0
b0
b11
SIX LEVELS
STACK REGISTER
The Carry flag is set when a carry or a borrow oc-
curs during arithmetic operations; otherwise it is
cleared. The Carry flag is also set to the value of
the bit tested in a bit test instruction; it also partici-
pates in the rotate left instruction.
NORMAL FLAGS
INTERRUPT FLAGS
NMI FLAGS
C
C
C
Z
Z
Z
The Zero flag is set if the result of the last arithme-
tic or logical operation was equal to zero; other-
wise it is cleared.
Switching between the three sets of flags is per-
formed automatically when an NMI, an interrupt or
a RETI instructions occurs. As the NMI mode is
VA000423
17/86
121
ST62T32B ST62E32B
3 CLOCKS, RESET, INTERRUPTS AND POWER SAVING MODES
3.1 CLOCK SYSTEM
The MCU features a Main Oscillator which can be
driven by an external clock, or used in conjunction
with an AT-cut parallel resonant crystal or a suita-
ble ceramic resonator. In addition, a Low Frequen-
cy Auxiliary Oscillator (LFAO) can be switched in
for security reasons, to reduce power consump-
tion, or to offer the benefits of a back-up clock sys-
tem.
Figure 9. Oscillator Configurations
CRYSTAL/RESONATOR CLOCK
ST6xxx
The Oscillator Safeguard (OSG) option filters
spikes from the oscillator lines, provides access to
the LFAO to provide a backup oscillator in the
event of main oscillator failure and also automati-
OSC
OSC
out
in
cally limits the internal clock frequency (f ) as a
INT
function of V , in order to guarantee correct oper-
DD
C
C
L1n
ation. These functions are illustrated in Figure 10,
Figure 11, Figure 12 and Figure 13.
L2
VA0016
Figure 9illustrates various possible oscillator con-
figurations using an external crystal or ceramic res-
onator, an external clock input or thelowestcost so-
EXTERNAL CLOCK
ST6xxx
lution using only theLFAO. C an C should have
L1
L2
acapacitanceintherange12to22pFforanoscillator
frequency in the 4-8 MHz range.
The internal MCU clock frequency (f ) is divided
INT
OSC
OSC
NC
out
in
by 12 to drive the Timer and the Watchdog timer,
and by 13 to drive the CPU core, while the A/D
converter is driven by f divided either by 6 or by
INT
VA0015A
12 as may be seen in Figure 12.
With an 8MHz oscillator frequency, the fastest ma-
chine cycle is therefore 1.625µs.
INTEGRATEDCLOCK
A machine cycleis the smallest unit of time needed
to execute any operation (for instance, to increment
the Program Counter). An instruction may require
two, four, or five machine cycles for execution.
OSG ENABLED option
ST6xxx
3.1.1 Main Oscillator
OSC
OSC
out
in
The main oscillator can be turned off (when the
OSG ENABLED option is selected) by setting the
OSCOFF bit of the OSCR Control Register. The
Low Frequency Auxiliary Oscillator is automatical-
ly started.
NC
18/86
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ST62T32B ST62E32B
CLOCK SYSTEM (Cont’d)
Turning on the main oscillator is achieved by re-
setting the OSCOFF bit of the OSCR Register or
by resetting the MCU. Restarting the main oscilla-
tor implies a delay comprising the oscillator start
up delay period plus the duration of the software
3.1.3 Oscillator Safe Guard
The Oscillator Safe Guard (OSG) affords drastical-
ly increased operational integrity in ST62xx devic-
es. The OSG circuit provides three basic func-
tions: it filters spikes from the oscillator lines which
would result in over frequency to the ST62 CPU; it
gives access to the Low Frequency Auxiliary Os-
cillator (LFAO), used to ensure minimum process-
ing in case of main oscillator failure, to offer re-
duced power consumption or to provide a fixed fre-
quency low cost oscillator; finally, it automatically
limits the internal clock frequency as a function of
supply voltage, in order to ensure correct opera-
tion even if the power supply should drop.
instruction at f
clock frequency.
LFAO
3.1.2 Low Frequency Auxiliary Oscillator
(LFAO)
The Low Frequency Auxiliary Oscillator has three
main purposes. Firstly, it can be used to reduce
power consumption in non timing critical routines.
Secondly, it offers a fully integrated system clock,
without any external components. Lastly, it acts as
a safety oscillator in case of main oscillator failure.
The OSG is enabled or disabled by choosing the
relevant OSG option. It may be viewed as a filter
whose cross-over frequency is device dependent.
This oscillator is available when the OSG ENA-
BLED option is selected. In this case, it automati-
cally starts one of its periods after the first missing
edge from the main oscillator, whatever the reason
(main oscillator defective, no clock circuitry provid-
ed, main oscillator switched off...).
Spikes on the oscillator lines result in an effectively
increased internal clock frequency. In the absence
of an OSG circuit, this may lead to an over fre-
quency for a given power supply voltage. The
OSG filters out such spikes (as illustrated in Fig-
ure 10). In all cases, when the OSG is active, the
User code, normal interrupts, WAIT and STOP in-
structions, are processed as normal, at the re-
duced f
frequency. The A/D converter accura-
LFAO
maximum internal clock frequency, f , is limited
INT
cy is decreased, since the internal frequency is be-
low 1MHz.
to f
, which is supply voltage dependent. This
OSG
relationship is illustrated in Figure 13.
At power on, the Low Frequency Auxiliary Oscilla-
tor starts faster than the Main Oscillator. It there-
fore feeds the on-chip counter generating the POR
delay until the Main Oscillator runs.
When the OSG is enabled, the Low Frequency
Auxiliary Oscillator may be accessed. This oscilla-
tor starts operating after the first missing edge of
the main oscillator (see Figure 11).
The Low Frequency Auxiliary Oscillator is auto-
matically switched off as soon as the main oscilla-
tor starts.
Over-frequency, at a given power supply level, is
seen by the OSG as spikes; it therefore filters out
some cycles in order that the internal clock fre-
quency of the device is kept within the range the
OSCR
particular device can stand (depending on V ),
Address: 0DBh
—
Read/Write
DD
and below f
: the maximum authorised frequen-
OSG
7
0
cy with OSG enabled.
OSC
OFF
Note. The OSG should be used wherever possible
as it provides maximum safety. Care must be tak-
en, however, as it can increase power consump-
tion and reduce the maximum operating frequency
-
-
-
-
-
-
-
Bit 7-1= These bits are not used and must be kept
cleared after reset.
to f
.
OSG
OSCOFF
. Main oscillator turn-off. When
Bit 0 =
low, this bit enables main oscillator to run. The
main oscillator is switched off when OSCOFF is
high.
19/86
123
ST62T32B ST62E32B
CLOCK SYSTEM (Cont’d)
Figure 10. OSG Filtering Principle
(1)
(2)
(3)
(4)
(1) Maximum Frequency for the device to work correctly
(2)
Actual Quartz Crystal Frequency at OSCin pin
(3)
(4)
Noise from OSCin
Resulting Internal Frequency
VR001932
Figure 11. OSG Emergency Oscillator Principle
Main
Oscillator
Emergency
Oscillator
Internal
Frequency
VR001933
20/86
124
ST62T32B ST62E32B
CLOCK SYSTEM (Cont’d)
Figure 12. Clock Circuit Block Diagram
POR
Core
: 13
OSG
TIMER 1
M
U
X
f
MAIN
OSCILLATOR
INT
Watchdog
M
: 12
: 6
U
X
ADC
LFAO
: 1
ARTIMER 16
Main Oscillator off
Figure 13. Maximum Operating Frequency (f
) versus Supply Voltage (V )
MAX
DD
Maximum FREQUENCY (MHz)
8
7
6
5
4
3
2
1
3
4
f
OSG
2
1
f
Min
OSG
2.5
3
3.5
4
4.5
5
5.5
6
SUPPLY VOLTAGE (V
)
DD
VR01807
Notes
:
1. In this area, operation is guaranteed at the quartz crystal frequency.
2. When the OSG is disabled, operation in this area is guaranteed at the crystal frequency. When the OSG
is enabled, operation in this area is guaranteed at a frequency of at least f
OSG Min.
3. When the OSG is disabled, operation in this area is guaranteed at the quartz crystal frequency. When
the OSG is enabled, access to this area is prevented. The internal frequency is kept a f
OSG.
4. When the OSG is disabled, operation in this area is not guaranteed
When the OSG is enabled, access to this area is prevented. The internal frequency is kept at f
OSG.
21/86
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ST62T32B ST62E32B
3.2 RESETS
The MCU can be reset in three ways:
– by the external Reset input being pulled low;
– by Power-on Reset;
The internal delay is generated by an on-chip coun-
ter. The internal reset line is released 2048 internal
clock cycles after release of the external reset.
Notes:
– by the digital Watchdog peripheral timing out.
3.2.1 RESET Input
To ensure correct start-up, the user should take
care that the reset signal is not released before the
The RESET pin may be connected to a device of
the application board in order to reset the MCU if
required. The RESET pin may be pulled low in
RUN, WAIT or STOP mode. This input can be
used to reset the MCU internal state and ensure a
correct start-up procedure. The pin is active low
and features a Schmitt trigger input. The internal
Reset signal is generated by adding a delay to the
external signal. Therefore even short pulses on
V
level is sufficient to allow MCU operation at
DD
the chosen frequency (see Recommended Oper-
ating Conditions).
A proper reset signal for a slow rising V supply
can generally be provided by an external RC net-
work connected to theRESET pin.
DD
Figure 14. Reset and Interrupt Processing
the RESET pin are acceptable, provided V has
DD
RESET
completed its rising phase and that the oscillator is
running correctly (normal RUN or WAIT modes).
The MCU is kept in the Reset state as long as the
RESET pin is held low.
NMI MASK SET
INT LATCH CLEARED
( IF PRESENT )
If RESET activation occurs in the RUN or WAIT
modes, processing of the user program is stopped
(RUN mode only), the Inputs and Outputs are con-
figured as inputs with pull-up resistors and the
main Oscillator is restarted. When the level on the
RESET pin then goes high, the initialization se-
quence is executed following expiry of the internal
delay period.
SELECT
NMI MODE FLAGS
PUT FFEH
If RESET pin activation occurs in the STOP mode,
the oscillator starts up and all Inputs and Outputs
are configured as inputs with pull-up resistors.
When the level of theRESET pin then goes high,
the initialization sequence is executed following
expiry of the internal delay period.
ON ADDRESS BUS
YES
IS RESET STILL
PRESENT?
3.2.2 Power-on Reset
The function of the POR circuit consists in waking
up the MCU at an appropriate stage during the
power-on sequence. At the beginning of this se-
quence, the MCU is configured in the Reset state:
all I/O ports are configured as inputs with pull-up
resistors and no instruction is executed. When the
power supply voltage rises to a sufficient level, the
oscillator starts to operate, whereupon an internal
delay is initiated, in order to allow the oscillator to
fully stabilize before executing the first instruction.
The initialization sequence is executed immediate-
ly following the internal delay.
NO
LOAD PC
FROM RESET LOCATIONS
FFE/FFF
FETCH INSTRUCTION
VA000427
22/86
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ST62T32B ST62E32B
RESETS (Cont’d)
3.2.3 Watchdog Reset
initialisation routine from being interrupted. The in-
itialisation routine should therefore be terminated
by a RETI instruction, in order to revert to normal
mode and enable interrupts. If no pending interrupt
is present at the end of the initialisation routine, the
MCU will continue by processing the instruction
immediately following the RETI instruction. If, how-
ever, a pending interrupt is present, it will be serv-
iced.
The MCU provides a Watchdog timer function in
order to ensure graceful recovery from software
upsets. If the Watchdog register is not refreshed
before an end-of-count condition is reached, the
internal reset will be activated. This, amongst oth-
er things, resets the watchdog counter.
The MCU restarts just as though the Reset had
been generated by the RESET pin, including the
built-in stabilisation delay period.
Figure 15. Reset and Interrupt Processing
3.2.4 Application Notes
RESET
No external resistor is required between V and
DD
the Reset pin, thanks to the built-in pull-up device.
The POR circuit operates dynamically, in that it
triggers MCU initialization on detecting the rising
JP:2 BYTES/4 CYCLES
JP
RESET
VECTOR
edge of V . The typical threshold is in the region
DD
of 2 volts, but the actual value of the detected
threshold depends on the way in which V rises.
DD
The POR circuit is NOT designed to supervise
static, or slowly rising or falling V .
DD
INITIALIZATION
ROUTINE
3.2.5 MCU Initialization Sequence
RETI: 1 BYTE/2 CYCLES
When a reset occurs the stack is reset, the PC is
loaded with the address of the Reset Vector (locat-
ed in program ROM starting at address 0FFEh). A
jump to the beginning of the user program must be
coded at this address. Following a Reset, the In-
terrupt flag is automatically set, so that the CPU is
in Non Maskable Interrupt mode; this prevents the
RETI
VA00181
Figure 16. Reset Block Diagram
V
DD
ST6
INTERNAL
RESET
f
CK
OSC
300kΩ
COUNTER
RESET
RESET
RESET
2.8kΩ
POWER ON RESET
WATCHDOG RESET
VA0200B
23/86
127
ST62T32B ST62E32B
RESETS (Cont’d)
Table 7. Register Reset Status
Register
Address(es)
0DBh
Status
Comment
Main oscillator on
Oscillator Control Register
EEPROM Control Register
Port Data Registers
0DFh
EEPROM enabled
0C0h to 0C2h
0C4h to 0C6h
0CCh to 0CEh
0C8h
Port Direction Register
Port Option Register
I/O are Input with or without pull-up
depending on PORT PULL option
Interrupt Option Register
TIMER Status/Control
Interrupt disabled
TIMER disabled
0D4h
00h
AR TIMER Status/Control 1 Register 0E8h
AR TIMER Status/Control 2 Register 0E1h
AR TIMER Status/Control 3 Register 0E2h
AR TIMER Status/Control 4 Register OE3h
AR TIMER stopped
SPI disabled
SPI Registers
0DCh to 0DDh
X, Y,V, W, Register
Accumulator
080H TO083H
0FFh
Data RAM
084h to 0BFh
0CBh
Data RAM Page REgister
Data ROM Window Register
EEPROM
0C9h
00h to 03Fh
0D0h
Undefined
As written if programmed
A/D Result Register
AR TIMER Capture Register
0DBh
AR TIMER Reload/Capture Register 0D9h
ARTIMER Mask Registers
OE0h-OEFh
ARTIMER Compare Registers
OEDh-OEEh
TIMER Counter Register
TIMER Prescaler Register
Watchdog Counter Register
A/D Control Register
0D3h
0D2h
0D8h
0D1h
FFh
7Fh
FEh
40h
Max count loaded
A/D in Standby
UART disabled
UART Control
OD7h
OD6h
UART Data Register
24/86
128
ST62T32B ST62E32B
3.3 DIGITAL WATCHDOG
The digital Watchdog consists of a reloadable
downcounter timer which can be used to provide
controlled recovery from software upsets.
When the Watchdog is disabled, low power Stop
mode is available. Once activated, the Watchdog
cannot be disabled, except by resetting the MCU.
The Watchdog circuit generates a Reset when the
downcounter reaches zero. User software can
prevent this reset by reloading the counter, and
should therefore be written so that the counter is
regularly reloaded while the user program runs
correctly. In the event of a software mishap (usual-
ly caused by externally generated interference),
the user program will no longer behave in its usual
fashion and the timer register will thus not be re-
loaded periodically. Consequently the timer will
decrement down to 00h and reset the MCU. In or-
der to maximise the effectiveness of the Watchdog
function, user software must be written with this
concept in mind.
In the HARDWARE option, the Watchdog is per-
manently enabled. Since the oscillator will run con-
tinuously, low power mode is not available. The
STOP instruction is interpreted as a WAIT instruc-
tion, and the Watchdog continues to countdown.
However, when the EXTERNAL STOP MODE
CONTROL option has been selected low power
consumption may be achieved in Stop Mode.
Execution of the STOP instruction is then gov-
erned by a secondary function associated with the
NMI pin. If a STOP instruction is encountered
when the NMI pin is low, it is interpreted as WAIT,
as described above. If, however, the STOP in-
struction is encountered when the NMI pin is high,
the Watchdog counter is frozen and the CPU en-
ters STOP mode.
Watchdog behaviour is governed by two options,
known as “WATCHDOG ACTIVATION” (i.e.
HARDWARE or SOFTWARE) and “EXTERNAL
STOP MODE CONTROL” (seeTable 8).
When the MCU exits STOP mode (i.e. when an in-
terrupt is generated), the Watchdog resumes its
activity.
In the SOFTWARE option, the Watchdog is disa-
bled until bit C of the DWDR register has been set.
Table 8. Recommended Option Choices
Functions Required
Stop Mode & Watchdog
Stop Mode
Recommended Options
“EXTERNAL STOP MODE” & “HARDWARE WATCHDOG”
“SOFTWARE WATCHDOG”
Watchdog
“HARDWARE WATCHDOG”
25/86
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ST62T32B ST62E32B
DIGITAL WATCHDOG (Cont’d)
The Watchdog is associated with a Data space
register (Digital WatchDog Register, DWDR, loca-
tion 0D8h) which is described in greater detail in
Section 3.3.1 Digital Watchdog Register (DWDR).
This register is set to 0FEh on Reset: bit C is
cleared to “0”, which disables the Watchdog; the
timer downcounter bits, T0 to T5, and the SR bit
are all set to “1”, thus selecting the longest Watch-
dog timer period. This time period can be set to the
user’s requirements by setting the appropriate val-
ue for bits T0 to T5 in the DWDR register. The SR
bit must be set to “1”, since it is this bit which gen-
erates the Reset signal when it changes to “0”;
clearing this bit would generate an immediate Re-
set.
Figure 17. Watchdog Counter Control
D0
C
D1
SR
RESET
D2
D3
D4
D5
D6
D7
T5
T4
T3
T2
T1
T0
It should be noted that the order of the bits in the
DWDR register is inverted with respect to the as-
sociated bits in the down counter: bit 7 of the
DWDR register corresponds, in fact, to T0 and bit
2 to T5. The user should bear in mind the fact that
these bits are inverted and shifted with respect to
the physical counter bits when writing to this regis-
ter. The relationship between the DWDR register
bits and the physical implementation of the Watch-
dog timer downcounter is illustrated in Figure 17.
Only the 6 most significant bits may be used to de-
fine the time period, since it is bit 6 which triggers
the Reset when it changes to “0”. This offers the
user a choice of 64 timed periods ranging from
3,072 to 196,608 clock cycles (with an oscillator
frequency of 8MHz, this is equivalent to timer peri-
ods ranging from 384µs to 24.576ms).
8
÷
2
÷
OSC 12
VR02068A
26/86
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ST62T32B ST62E32B
DIGITAL WATCHDOG (Cont’d)
3.3.1 Digital Watchdog Register (DWDR)
3.3.2 Application Notes
Address: 0D8h
—
Read/Write
The Watchdog plays an important supporting role
in the high noise immunity of ST62xx devices, and
should be used wherever possible. Watchdog re-
lated options should be selected on the basis of a
trade-off between application security and STOP
mode availability.
Reset status: 1111 1110b
7
0
T0
T1
T2
T3
T4
T5
SR
C
When STOP mode is not required, hardware acti-
vation without EXTERNAL STOP MODE CON-
TROL should be preferred, as it provides maxi-
mum security, especially during power-on.
Bit 0 = C: Watchdog Control bit
If the hardware option is selected, this bit is forced
high and the user cannot change it (the Watchdog
is always active). When the software option is se-
lected, the Watchdog function is activated by set-
ting bit C to 1, and cannot then be disabled (save
by resetting the MCU).
When STOP mode is required, hardware activa-
tion and EXTERNAL STOP MODE CONTROL
should be chosen. NMI should be high by default,
to allow STOP mode to be entered when the MCU
is idle.
When C is kept low the counter can be used as a
7-bit timer.
The NMI pin can be connected to an I/O line (see
Figure 18) to allow its state to be controlled by soft-
ware. The I/O line can then be used to keep NMI
low while Watchdog protection is required, or to
avoid noise or key bounce. When no more
processing is required, the I/O line is released and
the device placed in STOP mode for lowest power
consumption.
This bit is cleared to “0” on Reset.
SR
: Software Reset bit
Bit 1 =
This bit triggers a Reset when cleared.
When C = “0” (Watchdog disabled) it is the MSB of
the 7-bit timer.
This bit is set to “1” on Reset.
When software activation is selected and the
Watchdog is not activated, the downcounter may
be used as a simple 7-bit timer (remember that the
bits are in reverse order).
Bits 2-7 = T5-T0: Downcounter bits
It should be noted that the register bits are re-
versed and shifted with respect to the physical
counter: bit-7 (T0) is the LSB of the Watchdog
downcounter and bit-2 (T5) is the MSB.
The software activation option should be chosen
only when the Watchdog counter is to be used as
a timer. To ensure the Watchdog has not been un-
expectedly activated, the following instructions
should be executed within the first 27 instructions:
These bits are set to “1” on Reset.
jrr 0, WD, #+3
ldi WD, 0FDH
27/86
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ST62T32B ST62E32B
DIGITAL WATCHDOG (Cont’d)
These instructions test the C bit and Reset the
MCU (i.e. disable the Watchdog) if the bit is set
(i.e. if the Watchdog is active), thus disabling the
Watchdog.
Figure 18. A typical circuit making use of the
EXERNAL STOP MODE CONTROL feature
In all modes, a minimum of 28 instructions are ex-
ecuted after activation, before the Watchdog can
generate a Reset. Consequently, user software
should load the watchdog counter within the first
27 instructions following Watchdog activation
(software mode), or within the first 27 instructions
executed following a Reset (hardware activation).
SWITCH
NMI
I/O
It should be noted that when the GEN bit is low (in-
terrupts disabled), the NMI interrupt is active but
cannot cause a wake up from STOP/WAIT modes.
VR02002
Figure 19. Digital Watchdog Block Diagram
RESET
Q
RSFF
7
8
-2
-2
-12
R
SET
S
DB1.7 LOAD SET
OSCILLATOR
CLOCK
8
DB0
WRITE
RESET
DATA BUS
VA00010
I
28/86
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ST62T32B ST62E32B
3.4 INTERRUPTS
The CPU can manage four Maskable Interrupt
sources, in addition to a Non Maskable Interrupt
source (top priority interrupt). Each source is asso-
ciated with a specific Interrupt Vector which con-
tains a Jump instruction to the associated interrupt
service routine. These vectors are located in Pro-
gram space (seeTable 9).
ically reset by the core at the beginning of the non-
maskable interrupt service routine.
Interrupt request from source #1 can be configu-
red either as edge or level sensitive by setting ac-
cordingly the LES bit of the Interrupt Option Regis-
ter (IOR).
Interrupt request from source #2 are always edge
sensitive. The edge polarity can be configured by
setting accordingly the ESB bit of the Interrupt Op-
tion Register (IOR).
When an interrupt source generates an interrupt
request, and interrupt processing is enabled, the
PC register is loaded with the address of the inter-
rupt vector (i.e. of the Jump instruction), which
then causes a Jump to the relevant interrupt serv-
ice routine, thus servicing the interrupt.
Interrupt request from sources #3 & #4 are level
sensitive.
In edge sensitive mode, a latch is set when a edge
occurs on the interrupt source line and is cleared
when the associated interrupt routine is started.
So, the occurrence of an interrupt can be stored,
until completion of the running interrupt routine be-
fore being processed. If several interrupt requests
occurs before completion of the running interrupt
routine, only the first request is stored.
Interrupt sources are linked to events either on ex-
ternal pins, or on chip peripherals. Several events
can be ORed on the same interrupt source, and
relevant flags are available to determine which
event triggered the interrupt.
The Non Maskable Interrupt request has the high-
est priority and can interrupt any interrupt routine
at any time; the other four interrupts cannot inter-
rupt each other. If more than one interrupt request
is pending, these are processed by the processor
core according to their priority level: source #1 has
the higher priority while source #4 the lower. The
priority of each interrupt source is fixed.
Storage of interrupt requests is not available in lev-
el sensitive mode. To be taken into account, the
low level must be present on the interrupt pin when
the MCU samples the line after instruction execu-
tion.
At the end of every instruction, the MCU tests the
interrupt lines: if there is an interrupt request the
next instruction is not executed and the appropri-
ate interrupt service routine is executed instead.
Table 9. Interrupt Vector Map
Interrupt Source
Interrupt source #0
Interrupt source #1
Interrupt source #2
Interrupt source #3
Interrupt source #4
Priority
Vector Address
(FFCh-FFDh)
(FF6h-FF7h)
(FF4h-FF5h)
(FF2h-FF3h)
(FF0h-FF1h)
1
2
3
4
5
Table 10. Interrupt Option Register Description
SET
Enable all interrupts
Disable all interrupts
GEN
CLEARED
Rising edge mode on inter-
rupt source #2
SET
ESB
3.4.1 Interrupt request
Falling edge mode on inter-
rupt source #2
CLEARED
SET
All interrupt sources but the Non Maskable Inter-
rupt source can be disabled by setting accordingly
the GEN bit of the Interrupt Option Register (IOR).
This GEN bit also defines if an interrupt source, in-
cluding the Non Maskable Interrupt source, can re-
start the MCU from STOP/WAIT modes.
Level-sensitive mode on in-
terrupt source #1
LES
Falling edge mode on inter-
rupt source #1
CLEARED
NOT USED
OTHERS
Interrupt request from the Non Maskable Interrupt
source #0 is latched by a flip flop which is automat-
29/86
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ST62T32B ST62E32B
INTERRUPTS (Cont’d)
3.4.2 Interrupt Procedure
MCU
– Automatically the MCU switches back to the nor-
mal flag set (or the interrupt flag set) and pops
the previous PC value from the stack.
The interrupt procedure is very similar to a call pro-
cedure, indeed the user can consider the interrupt
as an asynchronous call procedure. As this is an
asynchronous event, the user cannot know the
context and the time at which it occurred. As a re-
sult, the user should save all Data space registers
which may be used within the interrupt routines.
There are separate sets of processor flags for nor-
mal, interrupt and non-maskable interrupt modes,
which are automatically switched and so do not
need to be saved.
The interrupt routine usually begins by the identify-
ing the device which generated the interrupt re-
quest (by polling). The user should save the regis-
ters which are used within the interrupt routine in a
software stack. After the RETI instruction is exe-
cuted, the MCU returns to the main routine.
Figure 20. Interrupt Processing Flow Chart
The following list summarizes the interrupt proce-
dure:
INSTRUCTION
MCU
FETCH
– The interrupt is detected.
INSTRUCTION
– The C and Z flags are replaced by the interrupt
flags (or by the NMI flags).
EXECUTE
– The PC contents are stored in the first level of
the stack.
INSTRUCTION
– The normal interrupt lines are inhibited (NMI still
active).
– The first internal latch is cleared.
LOAD PC FROM
INTERRUPT VECTOR
NO
WAS
(FFC/FFD)
THE INSTRUCTION
A RETI ?
–The associatedinterrupt vectorisloaded inthePC.
YES
IS THE CORE
ALREADY IN
NORMAL MODE?
SET
WARNING: In some circumstances, when a
maskable interrupt occurs while the ST6 core is in
NORMAL mode and especially during the execu-
tion of an ”ldi IOR, 00h” instruction (disabling all
maskable interrupts): if the interrupt arrives during
the first 3 cycles of the ”ldi” instruction (which is a
4-cycle instruction) the core will switch to interrupt
mode BUT the flags CN and ZN will NOT switch to
the interrupt pair CI and ZI.
YES
INTERRUPT MASK
?
NO
CLEAR
INTERRUPT MASK
PUSH THE
PC INTO THE STACK
SELECT
PROGRAM FLAGS
SELECT
INTERNAL MODE FLAG
User
”POP”
– User selected registers are saved within the in-
terrupt service routine (normally on a software
stack).
THE STACKED PC
CHECK IF THERE IS
AN INTERRUPT REQUEST
AND INTERRUPT MASK
NO
– The source of the interrupt is found by polling the
interrupt flags (if more than one source is associ-
ated with the same vector).
?
YES
VA000014
– The interrupt is serviced.
– Return from interrupt (RETI)
30/86
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ST62T32B ST62E32B
INTERRUPTS (Cont’d)
3.4.3 Interrupt Option Register (IOR)
Bit 5 = ESB: Edge Selection bit.
The Interrupt Option Register (IOR) is used to en-
able/disable the individual interrupt sources and to
select the operating mode of the external interrupt
inputs. This register is write-only and cannot be
accessed by single-bit operations.
The bit ESB selects the polarity of the interrupt
source #2.
Bit 4 = GEN: Global Enable Interrupt. When this bit
is set to one, all interrupts are enabled. When this
bit is cleared to zero all the interrupts (excluding
NMI) are disabled.
Address: 0C8h — Write Only
Reset status: 00h
When the GEN bit is low, the NMI interrupt is ac-
tive but cannot cause a wake up from STOP/WAIT
modes.
7
-
0
-
This register is cleared on reset.
LES ESB GEN
-
-
-
3.4.4 IInterrupt sources
Bit 7, Bits 3-0 = Unused.
LES Level/Edge Selection bit.
Bit 6 =
:
Interrupt
sources
available
on
the
ST62E32B/T32B are summarized in theTable 11
with associated mask bit to enable/disable the in-
terrupt request.
When this bit is set to one, the interrupt source #1
is level sensitive. When cleared to zero the edge
sensitive mode for interrupt request is selected.
Table 11. Interrupt Requests and Mask Bits
Address
Interrupt
source
Peripheral
Register
Mask bit
Masked Interrupt Source
Register
GENERAL
TIMER
A/D CONVERTER ADCR
IOR
C8h
GEN
ETI
I
All
All Interrupts, excluding NM
TMZ: TIMER Overflow
TSCR1
D4h
D1h
source 4
source 4
EAI
EOC: End of Conversion
RXIEN
TXIEN
RXRDY : Byte received
TXMT : Byte sent
UART
UARTCR
D7h
source 4
SCR1
SCR2
SCR3
SCR3
SCR3
E8h
E1h
E2h
E2h
E2h
OVFIEN
CP1IEN
CP2IEN
ZEROIEN
CMPIEN
OVFFLG: ARTIMER Overflow
CP1FLG
ARTIMER
CP2FLG
source 3
ZEROFLG: Compare to zero flag
CMPFLG: Compare flag
SPI
SPI
DCh
ALL
End of Transmission
source 1
source 1
source 2
source 0
source 2
source 1
Port PAn
Port PBn
Port PCn
Port PDn
Port PEn
ORPA-DRPA
C0h-C4h
ORPAn-DRPAn PAn pin
ORPBn-DRPBn PBn pin
ORPCn-DRPCn PCn pin
ORPDn-DRPDn PDn pin
ORPEn-DRPEn PEn pin
ORPB-DRPB C1h-C5h
ORPC-DRPC C2h-C6h
ORPD-DRPD C3h-C7h
ORPE-DRPE FCh-FDh
31/86
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ST62T32B ST62E32B
IINTERRUPTS (Cont’d)
Interrupt Polarity Register (IPR)
set, IPR is cleared and all port interrupts are not in-
verted (e.g. Port C generates interrupts on falling
edges).
Address: DAh
7
—
Read/Write
0
Bit 7 - Bits 5 = Unused.
-
-
-
PortE PortD PortC PortA PortB
Bit 4 = Port E Interrupt Polarity.
Bit 3 = Port D Interrupt Polarity.
Bit 2 = Port C Interrupt Polarity.
Bit 1= Port A Interrupt Polarity.
Bit 0 = Port B Interrupt Polarity.
In conjunction with IOR register ESB bit, the polar-
ity of I/O pins triggered interrupts can be selected
by setting accordingly the Interrupt Polarity Regis-
ter (IPR). If a bit in IPR is set to one the corre-
sponding port interrupt is inverted (e.g. IPR bit 2 =
1 ; port C generates interrupt on rising edge. At re-
Table 12. I/O Interrupts selections according to IPR, IOR programming
Interrupt
source
GEN
IPR3
IPR0
IOR5
Port B occurence
Port D occurence
1
1
1
1
1
1
1
1
0
0
0
0
0
1
1
1
1
X
0
0
1
1
0
0
1
1
X
0
1
0
1
0
1
0
1
X
falling edge
rising edge
rising edge
falling edge
falling edge
rising edge
rising edge
falling edge
Disabled
falling edge
rising edge
falling edge
rising edge
rising edge
falling edge
rising edge
falling edge
Disabled
2
Interrupt
source
GEN
IPR4
IPR1
IOR6
Port A occurence
Port E occurence
1
1
1
1
1
1
1
1
0
0
0
0
0
1
1
1
1
X
0
0
1
1
0
0
1
1
X
0
1
0
1
0
1
0
1
X
falling edge
low level
falling edge
low level
rising edge
high level
falling edge
low level
falling edge
low level
rising edge
high level
rising edge
high level
Disabled
1
rising edge
high level
Disabled
IPR2
Port C occurence
Interrupt source
0
1
falling edge
rising edge
0
32/86
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ST62T32B ST62E32B
INTERRUPTS (Cont’d)
Figure 21. Interrupt Block Diagram
FROM REGISTER PORT A,B,C,D,E
SINGLE BIT ENABLE
PBE
IPR Bit 2
V
DD
FF
CLK
CLR
INT #0 NMI (FFC,D))
Q
PORT C
Bits
NMI
I
Start
0
IPR Bit 0
FF
CLK
CLR
0
Q
I
PORT A
Bits
PBE
PBE
MUX
INT #1 (FF6,7)
Start
1
IPR Bit 4
1
PORT E
Bits
IOR bit 6 (LES)
SPI
RESTART
FROM
STOP/WAIT
IPR Bit 1
FF
CLK
CLR
INT #2 (FF4,5)
PBE
Q
PORT B
Bits
I
Start
2
IOR bit 5 (ESB)
IPR Bit 3
PORT D
Bits
PBE
CP1FLG
CP1IEN
CP2FLG
CP2IEN
OVFLG
OVFIEN
INT #3 (FF2,3)
CMPFLG
CMPIEN
ZEROFLG
ZEROIEN
TMZ
ETI
EAI
EOC
INT #4 (FF0,1)
RXRDY
RXIEN
IOR bit 4(GEN)
TXMT
TXIEN
33/86
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ST62T32B ST62E32B
3.5 POWER SAVING MODES
The WAIT and STOP modes have been imple-
mented in the ST62xx family of MCUs in order to
reduce the product’s electrical consumption during
idle periods. These two power saving modes are
described in the following paragraphs.
of the processor core prior to the WAIT instruction,
but also on the kind of interrupt request which is
generated. This is described in the following para-
graphs. The processor core does not generate a
delay following the occurrence of the interrupt, be-
cause the oscillator clock is still available and no
stabilisation period is necessary.
3.5.1 WAIT Mode
The MCU goes into WAIT mode as soon as the
WAIT instruction is executed. The microcontroller
can be considered as being in a “software frozen”
state where the core stops processing the pro-
gram instructions, the RAM contents and peripher-
al registers are preserved as long as the power
supply voltage is higher than the RAM retention
voltage. In this mode the peripherals are still ac-
tive.
3.5.2 STOP Mode
If the Watchdog is disabled, STOP mode is availa-
ble. When in STOP mode, the MCU is placed in
the lowest power consumption mode. In this oper-
ating mode, the microcontroller can be considered
as being “frozen”, no instruction is executed, the
oscillator is stopped, the RAM contents and pe-
ripheral registers are preserved as long as the
power supply voltage is higher than the RAM re-
tention voltage, and the ST62xx core waits for the
occurrence of an external interrupt request or a
Reset to exit the STOP state.
WAIT mode can be used when the user wants to
reduce the MCU power consumption during idle
periods, while not losing track of time or the capa-
bility of monitoring external events. The active os-
cillator is not stopped in order to provide a clock
signal to the peripherals. Timer counting may be
enabled as well as the Timer interrupt, before en-
tering the WAIT mode: this allows the WAIT mode
to be exited when a Timer interrupt occurs. The
same applies to other peripherals which use the
clock signal.
If the STOP state is exited due to a Reset (by acti-
vating the external pin) the MCU will enter a nor-
mal reset procedure. Behaviour in response to in-
terrupts depends on the state of the processor
core prior to issuing the STOP instruction, and
also on the kind of interrupt request that is gener-
ated.
If the WAIT mode is exited due to a Reset (either
by activating the external pin or generated by the
Watchdog), the MCU enters a normal reset proce-
dure. If an interrupt is generated during WAIT
mode, the MCU’s behaviour depends on the state
This case will be described in the following para-
graphs. The processor core generates a delay af-
ter occurrence of the interrupt request, in order to
wait for complete stabilisation of the oscillator, be-
fore executing the first instruction.
34/86
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ST62T32B ST62E32B
POWER SAVING MODE(Cont’d)
3.5.3 Exit from WAIT and STOP Modes
tered will be completed, starting with the
execution of the instruction which follows the
STOP or the WAIT instruction, and the MCU is
still in the interrupt mode. At the end of this rou-
tine pending interrupts will be serviced in accord-
ance with their priority.
The following paragraphs describe how the MCU
exits from WAIT and STOP modes, when an inter-
rupt occurs (not a Reset). It should be noted that
the restart sequence depends on the original state
of the MCU (normal, interrupt or non-maskable in-
terrupt mode) prior to entering WAIT or STOP
mode, as well as on the interrupt type.
– In the event of a non-maskable interrupt, the
non-maskable interrupt service routine is proc-
essed first, then the routine in which the WAIT or
STOP mode was entered will be completed by
executing the instruction following the STOP or
WAIT instruction. The MCU remains in normal
interrupt mode.
Interrupts do not affect the oscillator selection.
3.5.3.1 Normal Mode
If the MCU was in the main routine when the WAIT
or STOP instruction was executed, exit from Stop
or Wait mode will occur as soon as an interrupt oc-
curs; the related interrupt routine is executed and,
on completion, the instruction which follows the
STOP or WAIT instruction is then executed, pro-
viding no other interrupts are pending.
Notes:
To achieve the lowest power consumption during
RUN or WAIT modes, the user program must take
care of:
– configuring unused I/Os as inputs without pull-up
(these should be externally tied to well defined
logic levels);
3.5.3.2 Non Maskable Interrupt Mode
If the STOP or WAIT instruction has been execut-
ed during execution of the non-maskable interrupt
routine, the MCU exits from the Stop or Wait mode
as soon as an interrupt occurs: the instruction
which follows the STOP or WAIT instruction is ex-
ecuted, and the MCU remains in non-maskable in-
terrupt mode, even if another interrupt has been
generated.
– placing all peripherals in their power down
modes before entering STOP mode;
When the hardware activated Watchdog is select-
ed, or when the software Watchdog is enabled, the
STOP instruction is disabled and a WAIT instruc-
tion will be executed in its place.
3.5.3.3 Normal Interrupt Mode
If all interrupt sources are disabled (GEN low), the
MCU can only be restarted by a Reset. Although
setting GEN low does not mask the NMI as an in-
terrupt, it will stop it generating a wake-up signal.
If the MCU was in interrupt mode before the STOP
or WAIT instruction was executed, it exits from
STOP or WAIT mode as soon as an interrupt oc-
curs. Nevertheless, two cases must be consid-
ered:
The WAIT and STOP instructions are not execut-
ed if an enabled interrupt request is pending.
– If the interrupt is a normal one, the interrupt rou-
tine in which the WAIT or STOP mode was en-
35/86
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ST62T32B ST62E32B
4 ON-CHIP PERIPHERALS
4.1 I/O PORTS
The MCU features Input/Output lines which may
be individually programmed as any of the following
input or output configurations:
be also written by user software, in conjunction
with the related option registers, to select the dif-
ferent input mode options.
– Input without pull-up or interrupt
– Input with pull-up and interrupt
– Input with pull-up, but without interrupt
– Analog input
Single-bit operations on I/O registers are possible
but care is necessary because reading in input
mode is done from I/O pins while writing will direct-
ly affect the Port data register causing an unde-
sired change of the input configuration.
The Data Direction registers (DDRx) allow the
data direction (input or output) of each pin to be
set.
– Push-pull output
– Open drain output
The lines are organised as bytewise Ports.
The Option registers (ORx) are used to select the
different port options available both in input and in
output mode.
Each port is associated with 3 registers in Data
space. Each bit of these registers is associated
with a particular line (for instance, bits 0 of Port A
Data, Direction and Option registers are associat-
ed with the PA0 line of Port A).
All I/O registers can be read or written to just as
any other RAM location in Data space, so no extra
RAM cells are needed for port data storage and
manipulation. During MCU initialization, all I/O reg-
isters are cleared and the input mode with pull-ups
and no interrupt generation is selected for all the
pins, thus avoiding pin conflicts.
The DATA registers (DRx), are used to read the
voltage level values of the lines which have been
configured as inputs, or to write the logic value of
the signal to be output on the lines configured as
outputs. The port data registers can be read to get
the effective logic levels of the pins, but they can
Figure 22. I/O Port Block Diagram
RESET
V
DD
S
CONTROLS
IN
DATA
DIRECTION
REGISTER
V
DD
INPUT/OUTP UT
DATA
REGISTER
SHIFT
REGISTER
OPTION
REGISTER
S
OUT
TO INTERRUPT
TO ADC
VA00413
36/86
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ST62T32B ST62E32B
I/O PORTS (Cont’d)
4.1.1 Operating Modes
4.1.1.2 Interrupt Options
Each pin may be individually programmed as input
or output with various configurations.
All input lines can be individually connected by
software to the interrupt system by programming
the OR and DR registers accordingly. The inter-
rupt trigger modes (falling edge, rising edge and
low level) can be configured by software as de-
scribed in the Interrupt Chapter for each port.
This is achieved by writing the relevant bit in the
Data (DR), Data Direction (DDR) and Option reg-
isters (OR). Table 13 illustrates the various port
configurations which can be selected by user soft-
ware.
4.1.1.3 Analog Input Options
4.1.1.1 Input Options
Some pins can be configured as analog inputs by
programming the OR and DR registers according-
ly. These analog inputs are connected to the on-
chip 8-bit Analog to Digital Converter.ONLY ONE
pin should be programmed as an analog input at
any time, since by selecting more than one input
simultaneously their pins will be effectively short-
ed.
Pull-up, High Impedance Option. All input lines
can be individually programmed with or without an
internal pull-up by programming the OR and DR
registers accordingly. If the pull-up option is not
selected, the input pin will be in the high-imped-
ance state.
Table 13. I/O Port Option Selection
DDR
OR
0
DR
0
Mode
Input
Option
0
0
0
0
1
1
With pull-up, no interrupt
0
1
Input
No pull-up, no interrupt
1
0
Input
With pull-up and with interrupt
1
1
Input
Analog input (when available)
0
X
X
Output
Output
Open-drain output (20mA sink when available)
Push-pull output (20mA sink when available)
1
Note: X = Don’t care
37/86
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ST62T32B ST62E32B
I/O PORTS (Cont’d)
4.1.2 Safe I/O State Switching Sequence
outputs, it is advisable to keep a copy of the data
register in RAM. Single bit instructions may then
be used on the RAM copy, after which the whole
copy register can be written to the port data regis-
ter:
Switching the I/O ports from one state to another
should be done in a sequence which ensures that
no unwanted side effects can occur. The recom-
mended safe transitions are illustrated in Figure
23. All other transitions are potentially risky and
should be avoided when changing the I/O operat-
ing mode, as it is most likely that undesirable side-
effects will be experienced, such as spurious inter-
rupt generation or two pins shorted together by the
analog multiplexer.
SET bit, datacopy
LD a, datacopy
LD DRA, a
Warning: Care must also be taken to not use in-
structions that act on a whole port register (INC,
DEC, or read operations) when all 8 bits are not
available on the device. Unavailable bits must be
masked by software (AND instruction).
Single bit instructions (SET, RES, INC and DEC)
should be used with great caution on Ports Data
registers, since these instructions make an implicit
read and write back of the entire register. In port
input mode, however, the data register reads from
the input pins directly, and not from the data regis-
ter latches. Since data register information in input
mode is used to set the characteristics of the input
pin (interrupt, pull-up, analog input), these may be
unintentionally reprogrammed depending on the
state of the input pins. As a general rule, it is better
to limit the use of single bit instructions on data
registers to when the whole (8-bit) port is in output
mode. In the case of inputs or of mixed inputs and
The WAIT and STOP instructions allow the
ST62xx to be used in situations where low power
consumption is needed. The lowest power con-
sumption is achieved by configuring I/Os in input
mode with well-defined logic levels.
The user must take care not to switch outputs with
heavy loads during the conversion of one of the
analog inputs in order to avoid any disturbance to
the conversion.
Figure 23. Diagram showing Safe I/O State Transitions
Interrupt
pull-up
Input
Analog
010*
011
001
Input
pull-up (Reset
state)
000
100
Input
Output
Open Drain
Output
Open Drain
101
111
Output
Push-pull
Output
Push-pull
110
Note *. xxx = DDR, OR, DR Bits respectively
38/86
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ST62T32B ST62E32B
I/O PORTS (Cont’d)
Table 14. I/O Port configuration for the ST62T32B/E32B
MODE
AVAILABLE ON(1)
SCHEMATIC
PA0-PA7
PB0, PB3-PB7
PC5-PC7
Input
(Reset state if PORT
PULL option disabled)
Data in
PD0-PD7
PE0-PE4
Interrupt
PA0-PA7
Input
PB0, PB3-PB7
PC5-PC7
PD0-PD7
PE0-PE4
with pull up
Data in
(Reset state if PORT
PULL option enabled)
Interrupt
PA0-PA7
Input
PB0, PB3-PB7
PC5-PC7
PD0-PD7
PE0-PE4
with pull up
with interrupt
Data in
Interrupt
PA4-PA7
PB0, PB3-PB7
PC5-PC7
Analog Input
ADC
PD0-PD7
Open drain output
5mA
PA4-PA7
PB0, PB3-PB7
PC5-PC7
PD0-PD7
Data out
Open drain output
20mA
PA0-PA3
PE0-PE4
Push-pull output
5mA
PA4-PA7
PB0, PB3-PB7
PC5-PC7
PD0-PD7
Data out
Push-pull output
20mA
PA0-PA3
PE0-PE4
VR01992A
Note 1. Provided the correct configuration has been selected.
39/86
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ST62T32B ST62E32B
I/O PORTS (Cont’d)
4.1.3 ARTimer alternate functions
used as data in and data clock (Slave mode) for
the SPI. All input modes are available and I/O’s
can be read independantly of the SPI at any time.
As long as PWMEN (resp. OVFEN) bit is kept low,
the PA3/PWM (resp. PA2/OVF) pin is used as
standard I/O pin and therefore can be configured in
any mode through the DDR and OR registers.
PD3/Sout must be configured in open drain output
mode to be used as data out for the SPI. In output
mode, the value present on the pin is the port data
register content only if PD3 is defined as push pull
output, while serial transmission is possible only in
open drain mode.
If PWMEN (resp. OVFEN) bit is set, PA3/PWM (re-
sp. PA2/OVF) pin must be configured as output
through the DDR and OR registers to be used as
PWM (OVF) output of the ARTimer16. All output
modes are available.
4.1.5 UART alternate functions
PD4/RXD1 pin must be configured as input
through the DDR and OR registers to be used as
reception line for the UART. All input modes are
available and PD4 can be read independantly of
the UART at any time.
PA4/CP1 or PA5/CP2 pins must be configured as
input through DDR register to allow CP1 or CP2
triggered input capture of the ARTimer16. All input
modes are available and I/O’s can be read inde-
pendantly of the ARTimer at any time. As long as
RLDSEL2, RLDSEL1 bits do not enable CP1 or
CP2 triggered capture, PA4/CP1 and PA5/CP2 are
standard I/O’s configurable through DDR and OR
registers.
PD5/TXD1 pin must be configured as output
through the DDR and OR registers to be used as
transmission line for the UART. Value present on
the pin in output mode is the Data register content
as long as no transmission is active.
4.1.4 SPI alternate functions
PD2/Sin and PD1/Scl pins must be configured as
input through the DDR and OR registers to be
40/86
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ST62T32B ST62E32B
I/O PORTS (Cont’d)
Figure 24. Peripheral Interface Configuration of SPI, UART and AR Timer16
V
DD
PID
RXD
PD4/RXD1
PD5/TXD1
PD3/Sout
PD2/Sin
DR
UART
IARTOE
PID
PID
DR
0
1
MUX
TXD
PP/OD
OPR
DR
1
0
MUX
OUT
IN
PID
PID
DR
SYNCHRONOUS
SERIAL I/O
CLOCK
DR
PD1/Scl
PWMEN
PWM
PID
1
0
MUX
PA3/PWM
PA4/CP1
PA5/CP2
PA2/OVF
DR
PID
CP1
DR
ARTIMER 16
PID
CP2
DR
OVFEN
OVF
PID
1
0
MUX
DR
VR01661D
41/86
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ST62T32B ST62E32B
I/O PORTS (Cont’d)
4.1.6 I/O Port Option Registers
4.1.8 I/O Port Data Registers
ORA/B/C/D/E (CCh PA, CDh PB, CEh PC, CFh
DRA/B/C/D/E (C0h PA, C1h PB, C2h PC, C3h
PD, FEh PE)
PD, FCh PE)
Read/Write
Read/Write
7
0
7
0
Px7 Px6 Px5 Px4 Px3 Px2 Px1 Px0
Px7 Px6 Px5 Px4 Px3 Px2 Px1 Px0
Bit 7-0 = Px7 - Px0: Port A, B, C, D and E Option
Register bits.
Bit 7-0 = Px7 - Px0: Port A, B, C, D and E Data
Registers bits.
4.1.7 I/O Port Data Direction Registers
DDRA/B/C/D/E (C4h PA, C5h PB, C6h PC, C7h
PD, FDh PE)
Read/Write
7
0
Px7 Px6 Px5 Px4 Px3 Px2 Px1 Px0
Bit 7-0 = Px7 - Px0: Port A, B, C, D and E Data Di-
rection Registers bits.
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ST62T32B ST62E32B
4.2 TIMER
The MCU features an on-chip Timer peripheral,
consisting of an 8-bit counter with a 7-bit program-
mable prescaler, giving a maximum count of 2 .
The peripheral may be configured in three different
operating modes.
The prescaler input can be the internal frequency
INT
f
divided by 12 or an external clock applied to
15
the TIMER pin. The prescaler decrements on the
rising edge. Depending on the division factor pro-
grammed by PS2, PS1 and PS0 bits in the TSCR.
The clock input of the timer/counter register is mul-
tiplexed to different sources. For division factor 1,
the clock input of the prescaler is also that of tim-
er/counter; for factor 2, bit 0 of the prescaler regis-
ter is connected to the clock input of TCR. This bit
changes its state at half the frequency of the pres-
caler input clock. For factor 4, bit 1 of the PSC is
connected to the clock input of TCR, and so forth.
The prescaler initialize bit, PSI, in the TSCR regis-
ter must be set to “1” to allow the prescaler (and
hence the counter) to start. If it is cleared to “0”, all
the prescaler bits are set to “1” and the counter is
inhibited from counting. The prescaler can be
loaded with any value between 0 and 7Fh, if bit
PSI is set to “1”. The prescaler tap is selected by
means of the PS2/PS1/PS0 bits in the control reg-
ister.
Figure 25 shows the Timer Block Diagram. The
external TIMER pin is available to the user. The
content of the 8-bit counter can be read/written in
the Timer/Counter register, TCR, while the state of
the 7-bit prescaler can be read in the PSC register.
The control logic device is managed in the TSCR
register as described in the following paragraphs.
The 8-bit counter is decremented by the output
(rising edge) coming from the 7-bit prescaler and
can be loaded and read under program control.
When it decrements to zero then the TMZ (Timer
Zero) bit in the TSCR is set to “1”. If the ETI (Ena-
ble Timer Interrupt) bit in the TSCR is also set to
“1”, an interrupt request is generated as described
in the Interrupt Chapter. The Timer interrupt can
be used to exit the MCU from WAIT mode.
Figure 26 illustrates the Timer’s working principle.
Figure 25. Timer Block Diagram
DATABUS 8
8
8
8
6
5
4
3
2
b7
b6
b5
b4
b3
b2
b1
b0
8-BIT
COUNTER
STATUS/CONTROL
REGISTER
SELECT
PSC
1
OF 7
TMZ ETI TOUT
PSI
PS1
PS0
DOUT
PS2
1
0
3
TIMER
INTERRUPT
LINE
LATCH
SYNCHRONIZATION
LOGIC
:12
fOSC
VA00009
43/86
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ST62T32B ST62E32B
TIMER (Cont’d)
4.2.1 Timer Operating Modes
The user can select the desired prescaler division
ratio through the PS2, PS1, PS0 bits. When the
TCR count reaches 0, it sets the TMZ bit in the
TSCR. The TMZ bit can be tested under program
control to perform a timer function whenever it
goes high. The low-to-high TMZ bit transition is
used to latch the DOUT bit of the TSCR and trans-
fer it to the TIMER pin. This operating mode allows
external signal generation on the TIMER pin.
There are three operating modes, which are se-
lected by the TOUT and DOUT bits (see TSCR
register). These three modes correspond to the
two clocks which can be connected to the 7-bit
prescaler (f
÷ 12 or TIMER pin signal), and to
INT
the output mode.
4.2.1.1 Gated Mode
(TOUT = “0”, DOUT = “1”)
In this mode the prescaler is decremented by the
Table 15. Timer Operating Modes
TOUT
DOUT
Timer Pin
Input
Timer Function
Event Counter
Gated Input
Output “0”
Timer clock input (f ÷ 12), but ONLY when the
INT
signal on the TIMER pin is held high (allowing
pulse width measurement). This mode is selected
by clearing the TOUT bit in the TSCR register to
“0” (i.e. as input) and setting the DOUT bit to “1”.
0
0
1
1
0
1
0
1
Input
Output
Output
Output “1”
4.2.1.2 Event Counter Mode
(TOUT = “0”, DOUT = “0”)
4.2.2 Timer Interrupt
In this mode, the TIMER pin is the input clock of
the prescaler which is decremented on the rising
edge.
When the counter register decrements to zero with
the ETI (Enable Timer Interrupt) bit set to one, an
interrupt request is generated as described in the
Interrupt Chapter. When the counter decrements
to zero, the TMZ bit in the TSCR register is set to
one.
4.2.1.3 Output Mode
(TOUT = “1”, DOUT = data out)
The TIMER pin is connected to the DOUT latch,
hence the Timer prescaler is clocked by the pres-
caler clock input (f ÷ 12).
INT
Figure 26. Timer Working Principle
7-BIT PRESCALER
BIT3
BIT0
BIT1
BIT2
BIT4
BIT5
BIT6
CLOCK
PS0
PS1
PS2
2
0
1
3
4
5
6
7
8-1 MULTIPLEXER
BIT7
BIT0
BIT1
BIT2
BIT3
BIT4
BIT5
BIT6
8-BIT COUNTER
VA00186
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ST62T32B ST62E32B
TIMER (Cont’d)
4.2.3 Application Notes
Bit 4 = DOUT: Data Output
The user can select the presence of an on-chip
pull-up on the TIMER pin as option.
Data sent to the timer output when TMZ is set high
(output mode only). Input mode selection (input
mode only).
TMZ is set when the counter reaches zero; howev-
er, it may also be set by writing 00h in the TCR
register or by setting bit 7 of the TSCR register.
The TMZ bit must be cleared by user software
when servicing the timer interrupt to avoid unde-
sired interrupts when leaving the interrupt service
routine. After reset, the 8-bit counter register is
loaded with 0FFh, while the 7-bit prescaler is load-
ed with 07Fh, and the TSCR register is cleared.
This means that the Timer is stopped (PSI=“0”)
and the timer interrupt is disabled.
Bit 3 = PSI: Prescaler Initialize Bit
Used to initialize the prescaler and inhibit its count-
ing. When PSI=“0” the prescaler is set to 7Fh and
the counter is inhibited. When PSI=“1” the prescal-
er is enabled to count downwards. As long as
PSI=“0” both counter and prescaler are not run-
ning.
PS2, PS1, PS0
Bit 2, 1, 0 =
: Prescaler Mux. Se-
lect. These bits select the division ratio of the pres-
caler register.
If the Timer is programmed in output mode, the
DOUT bit is transferred to the TIMER pin when
TMZ is set to one (by software or due to counter
decrement). When TMZ is high, the latch is trans-
parent and DOUT is copied to the timer pin. When
TMZ goes low, DOUT is latched.
Table 16. Prescaler Division Factors
PS2
0
PS1
0
PS0
0
Divided by
1
2
0
0
1
A write to the TCR register will predominate over
the 8-bit counter decrement to 00h function, i.e. if a
write and a TCR register decrement to 00h occur
simultaneously, the write will take precedence,
and the TMZ bit is not set until the 8-bit counter
reaches 00h again. The values of the TCR and the
PSC registers can be read accurately at any time.
0
1
0
4
0
1
1
8
1
0
0
16
32
64
128
1
0
1
1
1
0
1
1
1
4.2.4 Timer Registers
Timer Status Control Register (TSCR)
Address: 0D4h — Read/Write
Timer Counter Register TCR
Address: 0D3h
—
Read/Write
7
0
7
0
TMZ
ETI
TOUT DOUT PSI
PS2
PS1
PS0
D7
D6
D5
D4
D3
D2
D1
D0
Bit 7 = TMZ: Timer Zero bit
Bit 7-0 = D7-D0: Counter Bits.
A low-to-high transition indicates that the timer
count register has decrement to zero. This bit must
be cleared by user software before starting a new
count.
Prescaler Register PSC
Bit 6 = ETI: Enable Timer Interrupt
Address: 0D2h
—
Read/Write
When set, enables the timer interrupt request. If
ETI=0 the timer interrupt is disabled. If ETI=1 and
TMZ=1 an interrupt request is generated.
7
0
D7
D6
D5
D4
D3
D2
D1
D0
TOUT
: Timers
Output Control
Bit 5 =
Bit 7 = D7: Always read as ”0”.
D6-D0
When low, this bit selects the input mode for the
TIMER pin. When high the output mode is select-
ed.
Bit 6-0 =
: Prescaler Bits.
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ST62T32B ST62E32B
4.3 ARTIMER 16
The ARTIMER16 is a timer module based on a 16
bit downcounter with Reload, Capture and Com-
pare features to manage timing requirements. Two
outputs provide PWM and Overflow (OVF) output
signals each with programmable polarity, and two
inputs CP1 and CP2 control start-up, capture
and/or reload operations on the central counter.
time as the write to the low byte. This high byte will
remain constant if further writes are made to the
low bytes, until the high byte is changed. Full
Read/Write access is available to all registers ex-
cept where mentioned.
The ARTIMER16 may be placed into the reset
mode by resetting RUNRES to 0 in order to
achieve lower consumption. The contents of
RLCP, CP, MASK and CMP are not affected, nor
is the previous run mode of the timer changed. If
RUNRES is subsequently set to 1, the timer re-
starts in the same RUN mode as previously set if
no changes are made to the timer status registers.
The ARTIMER16 includes four 16-bit registers
CMP,RLCP,MASK and CP for the Reload, Cap-
ture and compare functions, four 8-bit status/con-
trol registers and the associated control logic.The
16-bit registers are accessed from the 8-bit inter-
nal bus. The full 16-bit word is written in two bytes,
the high byte first and then the low byte. The high
byte is stored in an intermediate register and is
written to the target 16-bit register at the same
Finally, interrupt capabilities are associated to the
Reload, Capture and Compare features.
Figure 27. ARTIMER16 Block Diagram
fINT
PSC
16-Bit
8
16
SCR1
CMP
8
SCR2
Compare
PWM
16
8
16-Bit
SCR3
SCR4
MASK
RLCP
4
OVF
Compare-to-0
16-Bit
16
16
16
8
COUNTER
16-Bit
CP
CP1
INT
CONTROL LOGIC
CP2
VR02014
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ST62T32B ST62E32B
4.3.1 CENTRAL COUNTER
4.3.1.2 Compare functions
The core of the 16 bit Auto-Reload Timer is a 16-
bit synchronous downcounter which accepts the
MCU internal clock through a prescaler with a pro-
grammable ratio (1/1, 1/4, 1/16).
The value in the counter CT is continuously com-
pared to 0000h and to the value programmed into
the Compare Register CMP. The comparison
range to 0000h and CMP is defined by using the
MASK register to select which bits are used, there-
fore the comparisons performed are:
The maximum time for downcounting is therefore
16
2
x Psc x Tclk where Psc is the prescaler ratio,
?
and Tclk the period of the main oscillator.
– MASK&CT = MASK&CMP.
?
This down counter is stopped and its content kept
cleared as long as RUNRES bit is cleared.
– MASK&CT = 0000h.
When a matched comparison to 0000h or
MASK&CMP occurs, the flags ZEROFLG and
COMPFLG are respectively set.
4.3.1.1 Reload functions
The 16-bit down counter can be reloaded 3 differ-
ent ways:
By using MASK values reported inTable 17, the
MASK register works as counter frequency multi-
plier for the compare functions. In that case posi-
At a zero overflow occurrence with the bit RELOAD
cleared: The counter is reloaded to FFFFh.
tive masked comparison occur with a period of
(n+1)
At a zero overflow occurrence with the bit
RELOAD set: The counter is reloaded with the val-
ue programmed in the RLCP register. For each
overflow, the transition between 0000h and the re-
load value (RLCP or FFFFh) is flagged through the
OVFFLG bit.
2
x Psc x Tclk where n is the position of the
most significant bit of MASK value.
Table 17. Recommended Mask Values
MSbit at 1
position,n
Hexadecimal
Binary
FFFFh
7FFFh
3FFFh
1FFFh
0FFFh
...
0007h
0003h
0001h
1111 1111 1111 1111
0111 1111 1111 1111
0011 1111 1111 1111
0001 1111 1111 1111
0000 1111 1111 1111
...
0000 0000 0000 0111
0000 0000 0000 0011
0000 0000 0000 0001
15
14
13
12
11
At an external event on pin CP1 or CP2 with the bit
RELOAD set: The counter is reloaded with the val-
ue programmed in the RLCP register.
As a consequence, the time between a timer re-
load and a zero overflow occurrence depends on
the value in RLCP when RELOAD bit is set. This
time is equal to (RLCP+1) x Psc x Tclk when
2
1
0
16
RELOAD bit is set, while it is 2 x Psc x Tclk when
RELOAD bit is cleared.
Note: Writing 0000h in MASK gives a period equal
to two times the prescaled period Psc x Tclk.
Figure 28. Flags Setting in Compare and Reload Functions
FFFFh
or
RLCP
Counter
Value CT
CMP
0
ZEROFLG
Software Reset
OVFFLG
Software Reset
COMPFLG
Software Reset
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ST62T32B ST62E32B
CENTRAL COUNTER(Cont’d)
4.3.1.3 Capture functions
OVF pin output modes
Content of the counter CT can always be down-
loaded (captured) into the CP register at selecta-
ble event occurrence on pins CP1 and CP2, while
capture in RLCP is possible only when the bit
RELOAD is cleared.
Zero overflow (OVFFLG)
OVFMD
1
0
1
1
OVF pin
Set* Toggle
* The OVF pin is reset by clearing the flag OVF-
FLG.
Capture functions with RELOAD cleared are used
for period or pulse width measurements with input
CP2, or for phase measurements between two
signals on CP1 and CP2, with the counter in free
running mode. In these modes, counter values by
the two events occurence are stored into RLCP
and CP and the counter remains in free running
mode.
4.3.2.2 Frequency and duty cycles on PWM
pins
In Set/Reset mode (PWMMD=0), the period on the
PWM pin is the time between two matched
masked comparison to 0000h, at which PWM pin
is set (PWMPOL=1) or reset (PWMPOL=0). As
long as no reload function from RLCP is performed
(RELOAD bit cleared) and no mask is used, this
Capture functions with RELOAD set, are used for
same application purpose, but in that case, the
first event reloads the counter from RLCP while
the second event captures the counter content
into the CP register. Therefore, the counter is not
in free running mode for other functions since the
down counting start is initiated by either CP1, CP2
or RUNRES event according to RLDSEL1 and
RLDSEL2 bit.
16
value is 2 x Psc x Tclk. If, on the contrary, reload
function or a mask are used, the frequency is con-
trolled through the RLCP and MASK values (Fig-
ure 29). The condition to reset (PWMPOL=1) or
set back (PWMPOL=0) PWM pin is a matched
masked comparison to CMP. Given a RLCP and
MASK values within the Table 17, CMP defines
the duty cycle.
4.3.2 SIGNAL GENERATION MODES
4.3.2.1 Output modes
In Toggle mode (PWMMD=1), PWM pin changes
of state at each positive masked comparison to
CMP value. The frequency is half the frequency in
Set/Reset mode and the duty-cycle is always 50%.
Any positive
comparison
to 0000h
or
MASK&CMP, and any overflow occurence can be
used to control the OVF or PWM output pins in
various modes defined by bits OVFMD, PWMPOL,
PWMEN and PWMMD.
4.3.2.3 Frequency and duty cycles on OVF pin
OVF pin activation is directed by the timer overflow
occurence and therefore its frequency depends
only of the downcounting time from the reload val-
ue to 0000h. This means its period is equal to T=
(RLCP+1) x Psc x Tclk in Set/Reset mode and 2 x
(RLCP+1) x Psc x Tclk in Toggle mode.
PWM pin output modes
MASK & CNT
= 0000h
x
x
x
x
no yes no yes
yes no yes no
X
MASK&CT=
MASK&CMP
yes
Duty cycle is controlled in Set/Reset mode
(OVFMD cleared) by software, since OVF pin can
be reset only by clearing the OVFFLG bit. In toggle
mode (OVFMD set), the duty cycle is always 50%.
PWMEN
PWMMD
PWMPOL
PWM pin
0
X
0
0
0
X
1
1
1
0
0
1
0
0
1
0
1
1
0
1
1
1
X
Reset Set Set Reset Toggle
Table 18. Achievable periods on PWM pin
Mask value
FFFFh
xxxxh
(n+1)
Period in Set/Reset mode (PWMMD=0) (RLCP+1) x Psc x Tclk
2
x Psc x Tclk
(n+1)
Period in Toggle mode (PWMMD=1)
2 x (RLCP+1) x Psc x Tclk
2 x 2
x Psc x Tclk
Note
: n is the position of the most significant bit of MASK value.
48/86
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ST62T32B ST62E32B
Figure 29. Mask Impact on the Compare Functions in PWM mode (PWMD=0, PWMPOL=1)
Counter
Bit 0...3
F
E
D
C
B
A
9
8
7
6
5
4
3
2
1
0
F
4
MASK
000Fh
2 /fCLK
most
significant
“1” is bit 3
3
2 /fCLK
most
significant
“1” is bit 2
0007h
0003&000C = 0000h
0003&0007 = 0003&000F
2
2 /fCLK
most
significant
“1” is bit 1
0003h
0001h
1
2 /fCLK
most
significant
“1” is bit 0
CMP = 000Fh
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ST62T32B ST62E32B
4.3.3 TIMINGS MEASUREMENT MODES
– CP1 triggered restart mode with CP2 event de-
tection.
These modes are based on the capture of the
down counter content into either CP or RLCP reg-
isters. Some are used in conjunction with a syn-
chronisation of the down counter by reload func-
tions on external event on CPi pins or software
RUNRES setting, while other modes do not affect
the downcounting. As long as RELOAD bit is
cleared, the down counter remains in free running
mode.
– CP2 triggered restart mode with second CP2
event detection.
– Software triggered restart mode with CP2 event
detection.
CP1 triggered restart mode with CP2 event de-
tection.
This mode is enabled for RLDSEL2=0 and
RLDSEL1=1.
RELOAD
External events on CPi pins are enabled as soon as
RUNRES bit is set, which letsthe prescaler and the
down counter running. Thenext activeedge on CP1
causes the counter to be loaded from RLCP, the
CP1FLG to beset and thedowncounting startsfrom
RLCP value. Each following active edge on CP1will
causeareload ofthecounter. If CP1FLG isnotreset
before thenext reload, theCP1ERR flag isset atthe
same time as the counter is reloaded. Both flags
should then be cleared by software.
1
0
Reload on CP1,CP2, RUNRES / Capture CP2
Capture CP1 / Capture CP2
4.3.3.1 Timing measurement with startup
control
Three startup conditions, selected by RLDSELi bit
can reload the counter from RLCP and initiate the
down counting when RELOAD bit is set. The first
mode is software controlled through the RUNRES
bit, while thetwo others are based on external event
on pins CP1 and CP2 with configurable polarities.
While the counter is counting, any active edge on
CP2 will capture the value of the counter at that in-
stant into the CP Register and set the CP2FLG bit.
If CP2FLG is not cleared before the following CP2
event, the CP2ERR flag bit is set, and no new cap-
ture can be performed
External event on CP2 pin (with configurable po-
larities) is used as strobe to launch the capture of
the CT counter into CP. When RELOAD bit is set,
RLCP cannot be used for capture, since it contains
the reload value..
Capturing is re-enabled by clearing both CP2FLG
and CP2ERR.
Finally, 3 different Reload/Capture sequences are
available:
Ifacaptureon CP2and areload onCP1occurat the
same time, the capture ofthe counter to CP is made
first, and then the counter is reloaded from RLCP.
Figure 30. CP1 Triggered Restart Mode with CP2 Event Detection
COUNTER
0000h
0000h
CT
RUNRES
Enable the Inputs
CP1
Software Reset
Disabled Reload and Start
Set CP1FLG
Reload
Set CP1ERR
Reload
Set CP1FLG
Disabled
CP2
Disabled Capture CT into CP
Set CP2FLG
Set CP2ERR
Clear all Flags
First Capture in CP
Then Reload
Set CP1ERR, CP2FLG
Disabled
VR02007
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ST62T32B ST62E32B
TIMINGS MEASUREMENT MODES(Cont’d)
CP2 triggered restart mode with CP2 event de-
tection.
Note: After Reset, the first CP2 event will capture
the 0000h state of the counter into CP and then
will restart the counter after loading it from RLCP.
CP2FLG flag must always be cleared to execute
another capture into CP.
This mode is enabled for RLDSEL2=1 and
RLDSEL1=0.
As long as RUNRES bit is set, an external event
on CP2 pin generates both, at first the capture into
CP, and then the reload from RLCP. Capture into
CP on CP2 event is enabled only if CP2FLG and
CP2ERR are cleared, otherwise only reload func-
tions from RLCP are performed.
Software triggered restart mode with CP2
event detection.
This mode is enabled for RLDSEL2=0 and
RLDSEL1=0.
RUNRES bit setting initiates the reload and startup
of the downcounting, while CP2 is used as strobe
source for the CT capture into CP register.
An external event on CP1 activates CP1FLG or
CP1ERR flags without any impact on the reload or
capture functions.
Figure 31. CP2 Triggered Restart Mode with CP2 Event Detection
CP1
Set CP1FLG
Set CP1ERR
No action
CP2
First Capture CT into CP
Then Reload CT from RLCP
Set CP2FLG
Reload CT from RLCP Reload CT from RLCP
Set CP2ERR
VR02007C
Figure 32. Software Triggered Restart Mode with CP2 Event Detection
COUNTER
0000h
0000h
CT
RUNRES
Load Counter from RLCP and Startup
CP1
Software Reset
CP1 disabled
Set CP1FLG
CP1 disabled
Set CP1ERR
CP2
Capture CT into CP
Set CP2FLG
CP2 disabled
Set CP2ERR
VR02007D
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ST62T32B ST62E32B
TIMINGS MEASUREMENT MODES(Cont’d)
4.3.3.2 Timing measurement without startup
control
ond following active edge will trig CP2ERR without
any capture into neither RLCP or CP.
The down counter is in free running mode with
RUNRES bit set and RELOAD bit cleared. This
means counter automatically restarts from FFFFh
on zero overflow and signal generation on PWM
and OVF pins is not affected.
4.3.4 INTERRUPT CAPABILITIES
The interrupt source latches of the ARTIMER16
are always enabled and set any time the interrupt
condition occurs.
The interrupt output is a logical OR of five logical
ANDs:
Two independent capture paths exist to CP and
RLCP, which are both Read only registers. CP1 is
the source (Configurable polarity) for a capture
into RLCP while CP2 is the source (Configurable
polarity) of a capture into CP.
– INT = [(CP1FLG & CP1IEN)
– OR (CP2FLG & CP2IEN)
– OR(OVFFLG & OVFIEN)
– OR(COMPFLG & CMPIEN)
– OR (ZEROFLG & ZEROIEN)]
Thus, if any enable bit is 1, the interrupt output of
the ARTIMER16 goes high when the respective
flag is set. If no enable bit is 1, and one of the in-
terrupt flags is set, the interrupt output remains 0,
but if the respective enable bit is set to 1 through a
write operation, the interrupt output will go high,
signalling the interrupt to the Core.
Independently of CP2 signal, if CP1FLG and
CP1ERR are cleared, the first active edge on CP1
will trigger a capture into RLCP, triggering
CP1FLG. As long as CP1FLG has not been
cleared, a second following active edge will trig
CP1ERR without any capture into neither RLCP
nor CP.
Independently of CP1 signal, if CP2FLG and
CP2ERR are cleared, the first active edge on CP2
will trigger a capture into CP, triggering CP2FLG.
As long as CP2FLG has not been cleared, a sec-
Figure 33. Positive CP1 - to negative CP2-Edge Measurement C( P1POL = 1, CP2POL = 0)
COUNTER
CP1
Capture into RLCP
Set CP1FLG
Set CP1ERR
CP2
Capture into CP
Set CP2FLG
Set CP2ERR
VR02006F
Application Note:
CP1FLG or CP2FLG is set at first following a reset
of these flags.
Depending on polarity setting for CP1/CP2, and of
CP1/CP2 connections, phase, period and pulse
width measurements can be achieved. The total
independence between CP1 and CP2 captures al-
lows phase detection by measuring which of
CP1=CP2
Yes
CP1POL=CP2POL
Measurement
Period
Yes
No
X
Yes
Pulse width
Phase
No
52/86
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ST62T32B ST62E32B
4.3.5 CONTROL REGISTERS
Bit 0 = This bit is reserved and must be set to 0.
Status Control Register 2 (SCR2)
Status Control Register 1 (SCR1)
Address: E8h - Read/Write/Clear only
Address: E1h - Read/Write/Clear only
7
0
-
7
0
PSC2 PSC1 RELOAD RUNRES OVFIEN OVFFLG OVFMD
-
CP1ERR CP2ERR CP1IEN CP1FLG CP1POL RLDSEL2 RLDSEL1
PSC2..PSC1
Bits 7 & 6 =
. Clock Prescaler. These
Bit 7 = Reserved. Must be kept cleared.
CP1ERR
1 if a new CP1 event has taken place since
CP1FLG was set to signal an error condition, it is 0
if there has been no event.
bits define the prescaler options for the prescaler
to the Counter Register according to the following
table.
Bit 6 =
. CP1 Error Flag. This bit is set to
PSC2 PSC1
Function
Clock Disabled (prescaler and counter
stopped
It is recommended to clear CP1ERR at any time
that CP1FLG is cleared, as further CP1 events
cannot be recognised if CP1ERR is set. This bit
cannot bet set by write, only cleared.
0
0
0
1
1
1
0
1
Prescale by 1
Prescale by 4
Prescale by 16
CP2ERR
. CP1 Error Flag. This bit is set to
Bit 5 =
1 if a new CP2 event has taken place since
CP2FLG was set to signal an error condition, it is 0
if there has been no event.
It is recommended to clear CP2ERR at any time
that CP2FLG is cleared, as further CP2 events
cannot be recognised if CP2ERR is set. This bit
cannot bet set by write, only cleared.
The Prescaler must be disabled (PSC2 = 0, PSC1
= 0) before a new prescaler factor is set if the
counter is running (after a hardware reset the
prescaler is automatically disabled).
To avoid inconsistencies in timing, the prescaler
factor should be set first, and then the counter
started.
Bit 4 = CP1IEN. CP1 Interrupt Enable. CP1 The
Capture 1 Interrupt is masked when this bit is 0.
Setting the bit to 1 enables the CP1 event flag
CP1FLG to set the ARTIMER interrupt.
Bit 5 = RELOAD. Reload enabled. When set this
bit enables reload from RLCP register into CT reg-
ister. On the contrary, if RELOAD is cleared,
RLCP is used as target for capture from the coun-
ter CT register.
Bit 3 = CP1FLG. CP1 Interrupt Flag. When this bit
is 0, no CP1 event has occurred since the last
clear of this bit. If the bit is at 1, a CP1 event has
occurred.
RUNRES
. Run/Reset. This bit enables the
Bit 4 =
RUN or RESET operation of the ARTIMER.
If 0, the counter CT is cleared to zero, and is
stopped. Setting this bit to 1 permits the startup of
the counter, and enables the synchronisation cir-
cuits for the timer inputs CP1 and CP2.
This bit cannot be set by program, only cleared.
Bit 2 = CP1POL. CP1 Edge Polarity Select.
CP1POL defines the polarity for triggering the CP1
event.
A 0 defines the action on a falling edge on the CP1
input, a 1 on a rising edge.
OVFIEN
. Overflow Int. Enable. The Over-
Bit 3 =
flow Interrupt is masked when this bit is 0.
Setting the bit to 1 enables the overflow flag to set
the ARTIMER interrupt.
RLDSEL2..RLDSEL1
. Reload Source
Bit 1 & 0 =
Select. These bits define the source for the reload
events; they do not affect the operation of the cap-
ture modes.
Bit 2 = OVFFLG. When this bit is 0, no overflow
has occurred since the last clear of this bit. If the
bit is at 1, an overflow has occurred.
This bit cannot be set by program, only cleared.
RLDSEL2 RLDSEL1
Function
Reload and startup triggered by
RUNRES
Bit 1 = OVFMD. The Overflow Output mode is set
by this bit; when 0, the overflow output is run in set
mode (OVF will be set on the first overflow event,
and will be reset when OVFFLG is cleared). When
1 the overflow output is in toggle mode; OVF tog-
gles its state on every overflow event (independ-
ent to the state of OVFFLG).
0
0
0
1
Reload triggered by every CP1
event
Reload triggered by every CP2
event
1
1
0
1
Reload disabled
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ST62T32B ST62E32B
CONTROL REGISTERS(Cont’d)
Status Control Register 3 (SCR3)
Address: E2h - Read/Write/Clear only
Masked-Compare event has occurred.
This bit cannot be set by program, only cleared.
Bit 2 = ZEROIEN. Compare to Zero Int Enable.
The Masked-Counter Zero Interrupt is masked
when this bit is 0. Setting the bit to 1 enables the
ZEROFLG flag to set the ARTIMER interrupt.
7
0
CP2POL CP2IEN CP2FLG CMPIEN CMFLG ZEROIEN ZEROFLG PWMMD
ZEROFLG
. Compare to Zero Flag. When
Bit 1 =
Bit 7 = CP2POL. CP2 Edge Polarity Select.
CP2POL defines the polarity for triggering the CP2
event.
A 0 defines the action on a falling edge on the CP2
input, a 1 on a rising edge.
this bit is 0, no Masked-Counter Zero event has
occurred since the last clear of this flag. If the bit is
at 1, a Masked-Counter Zero event has occurred
as the Masked Counter state equals 0 when run-
ning or on hold (not on Reset).
Bit 6 = CP2IEN. CP2 Interrupt Enable. The Cap-
ture 2 Interrupt is masked when this bit is 0. Set-
ting the bit to 1 enables the CP2 event flag
CP2FLG to set the ARTIMER interrupt.
PWMMD
. PWM Output Mode Control. The
Bit 0 =
PWM Output mode is set by this bit; when 0, the
PWM output is run in set/reset mode (the PWM
output is set on a Masked-Counter Zero event and
is reset when on a Masked-Compare event).
CP2FLG
. CP2 Interrupt Flag. When this bit
Bit 5 =
When 1 the PWM output is in toggle mode; PWM
toggles its state on every Masked-Compare event.
is 0, no CP2 event has occurred since the last
clear of this flag. If the bit is at 1, the first CP2
event and capture into CP has occurred.
Notes:
This bit cannot be set by program, only cleared.
A Masked-Compare is the logical AND of the Mask
Register MASK with the Counter Register CT,
compared with the logical AND of the compare
Register CMP: [(MASK & CT) = (MASK&CMP)].
Bit 4 = CMPIEN. Compare Int. Enable. The Com-
pare Interrupt is masked when this bit is 0.
Setting the bit to 1 enables the Compare flag
CMPFLG to set the ARTIMER interrupt.
A Masked-Counter Zero is the logical AND of the
Mask Register MASK with the Counter Register
CT, compared with zero: [(MASK & CT) = 0000h]
CMPFLG
. Compare Flag. When this bit is
Bit 3 =
0, no Masked-Compare True event has occurred
since the last clear of this flag. If the bit is at 1, a
54/86
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ST62T32B ST62E32B
CONTROL REGISTERS(Cont’d)
Status Control Register 4 (SCR4)
4.3.6 16-BIT REGISTERS
Address: E3h - Read/Write/Clear only
Note: Care must be taken when using single-bit
instructions (RES/SET/INC/DEC) 16-bit registers
(RLCP, CP, CMP, MSK) since these instructions
imply a READ-MODIFY-WRITE operation on the
register. As the ST6 is based on a 8-bit architec-
ture, to write a 16-bit register, the high byte must
be written first to an intermediate register (latch
register) and the whole 16-bit register is loaded at
the same time as the low byte is written. A WRITE
operation of the HIGH byte is performed on the in-
termediate register (latch register) but a READ op-
eration of the HIGH byte is directly performed on
the 16-bit register (last loaded value). As a conse-
quence, it is always mandatory to write the LOW
byte before any single-bit instruction on the HIGH
byte in order to load the value set in the intermedi-
ate register to the 16-bit register (refresh the 16-bit
register).
7
0
OVFPO
PWME
N
Res. Res. Res. Res.
OVFEN PMPOL
L
Bit7- Bit4 = Reserved, set to 0.
Bit 3 = OVFPOL. Overflow Output Polarity. This bit
defines the polarity for the Overflow Output OVF.
When 0, OVF is set on every overflow event if en-
abled in Set mode (OVFEN = 1, OVFMD = 0). The
reset state of OVF is 0.
When 1, OVF is reset on every overflow event if
enabled in Set mode.
The reset state of OVF is 1.
Bit 2 = OVFEN. Overflow Output Enable. This bit
enables the Overflow output OVF. When 0 the
Overflow output is disabled: if OVFPOL = 0, the
state of OVF is 0, if OVFPOL = 1, the state of
OVF = 1.The Overflow Output is enabled when
this bit = 1, it must be set to use the OVF output.
Example:
The following sequence is NOT GOOD:
ldi t16cmph, 055h
Bit 1 = PWMPOL. PWM Output Polarity. This bit
defines the polarity for the PWM Output PWM.
When 0, PWM is set on every Masked-Counter
Zero event and is reset on a Masked-Compare if
enabled in Set/Reset mode (PWMEN = 1, PWM-
MD = 0).
ldi t16cmpl, 000h
; t16cmp (16-bit register)=5500h
ldi t16cmph, 0AAh
; t16cmp (16-bit register)=5500h
inc t16cmph
The reset state of PWM pin is 0 When 1, OVF is
set on every Masked-Compare event and is reset
on a Masked-Counter Zero event if enabled in
Set/Reset mode (PWMEN = 1, PWMMD = 0).
The reset state of PWM is 1.
; t16cmp (16-bit register)=5500h
ldi t16cmpl, 000h
; t16cmp (16-bit register)=5600h
; and NOT AB00h
Bit 0 = PWMEN. PWM Output Enable. This bit en-
ables the PWM output PWM. When 0 the PWM
output is disabled: if PWMPOL = 0, the state of
PWM is 0, if PWMPOL = 1, the state of PWM = 1.
The CORRECT sequence is:
ldi t16cmph, 055h
ldi t16cmpl, 000h
The PWM Output is enabled when this bit = 1, it
must be set to use the PWM output.
; t16cmp (16-bit register)=5500h
ldi t16cmph, 0AAh
Notes:
A Masked-Compare is the logical AND of the Mask
Register MASK with the Counter Register CT,
compared with the logical AND of the compare
Register CMP: [(MASK & CT) = (MASK&CMP)].
A Masked-Counter Zero is the logical AND of the
Mask Register MASK with the Counter Register
CT, compared with zero: [(MASK & CT) = 0000h].
; t16cmp (16-bit register)=5500h
ldi t16cmpl, 000h
; t16cmp (16-bit register)=AA00h
inc t16cmph
; t16cmp (16-bit register)=AA00h
ldi t16cmpl, 000h
;t16cmp (16-bit register)=AB00h
55/86
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ST62T32B ST62E32B
Reload/Capture Register High Byte (RLCP)
Compare Register High Byte (CMP)
Address: E9h - Read/ (Write if RELOAD bit set)
Address: EDh - Read/Write
D7-D0. These bits are the High byte (D15-D8) of
the 16-bit Reload/Capture Register.
D7-D0. These bits are the High byte (D15-D8) of
the 16-bit Compare Register.
Reload/Capture Register Low Byte (RLCP)
Compare Register Low Byte (CMP)
Address: EAh - Read/ (Write if RELOAD bit set)
Address: EEh - Read/Write
D7-D0. These bits are the Low byte (D7-D0) of the
16-bit Reload/Capture Register.
D7-D0. These bits are the Low byte (D7-D0) of the
16-bit Compare Register.
Capture Register High Byte (CP)
Mask Register High Byte (MASK)
Address: EBh - Read Only
Address: EFh - Read/Write
D7-D0. These bits are the High byte (D15-D8) of
the 16-bit Capture Register.
D7-D0. These bits are the High byte (D15-D8) of
the 16-bit Mask Register.
Capture Register Low Byte (CP)
Mask Register Low Byte (MASK)
Address: ECh - Read Only
Address: E0h - Read/Write
D7-D0. These bits are the Low byte (D7-D0) of the
16-bit Capture Register.
D7-D0. These bits are the Low byte (D7-D0) of the
16-bit Mask Register.
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ST62T32B ST62E32B
4.4 A/D CONVERTER (ADC)
The A/D converter peripheral is an 8-bit analog to
digital converter with analog inputs as alternate I/O
functions (the number of which is device depend-
ent), offering 8-bit resolution with a selectable con-
version time of 70us or 35µs (at an oscillator clock
frequency of 8MHz).
one instruction before the beginning of the conver-
sion to allow stabilisation of the A/D converter.
This action is also needed before entering WAIT
mode, since the A/D comparator is not automati-
cally disabled in WAIT mode.
During Reset, any conversion in progress is
stopped, the control register is reset to 40h and the
ADC interrupt is masked (EAI=0).
The ADC converts the input voltage by a process
of successive approximations, using a clock fre-
quency derived from the oscillator with a division
factor of 12 or 6. After Reset, division by 12 is used
by default to insure compatibility with other mem-
bers of the ST62 MCU family. With an oscillator
clock frequency less than 1.2MHz, conversion ac-
curacy is decreased.
Figure 34. ADC Block Diagram
INTERRUPT
CLOCK
Ain
CONVERTER
RESET
Selection of the input pin is done by configuring
the related I/O line as an analog input via the Op-
tion and Data registers (refer to I/O ports descrip-
tion for additional information). Only one I/O line
must be configured as an analog input at any time.
The user must avoid any situation in which more
than one I/O pin is selected as an analog input si-
multaneously, to avoid device malfunction.
AV
SS
AV
DD
CONTROL REGISTER
8
RESULT REGISTER
8
The ADC uses two registers in the data space: the
ADC data conversion register, ADR, which stores
the conversion result, and the ADC control regis-
ter, ADCR, used to program the ADC functions.
CORE
CONTROL SIGNALS
CORE
VA00418
A conversion is started by writing a “1” to the Start
bit (STA) in the ADC control register. This auto-
matically clears (resets to “0”) the End Of Conver-
sion Bit (EOC). When a conversion is complete,
the EOC bit is automatically set to “1”, in order to
flag that conversion is complete and that the data
in the ADC data conversion register is valid. Each
conversion has to be separately initiated by writing
to the STA bit.
4.4.1 Application Notes
The A/D converter does not feature a sample and
hold circuit. The analog voltage to be measured
should therefore be stable during the entire con-
version cycle. Voltage variation should not exceed
±1/2 LSB for the optimum conversion accuracy. A
low pass filter may be used at the analog input
pins to reduce input voltage variation during con-
version.
The STA bit is continuously scanned so that, if the
user sets it to “1” while a previous conversion is in
progress, a new conversion is started before com-
pleting the previous one. The start bit (STA) is a
write only bit, any attempt to read it will show a log-
ical “0”.
When selected as an analog channel, the input pin
is internally connected to a capacitor C of typi-
ad
cally 12pF. For maximum accuracy, this capacitor
must be fully charged at the beginning of conver-
sion. In the worst case, conversion starts one in-
struction (6.5 µs) after the channel has been se-
lected. In worst case conditions, the impedance,
ASI, of the analog voltage source is calculated us-
ing the following formula:
The A/D converter features a maskable interrupt
associated with the end of conversion. The inter-
rupt request occurs when the EOC bit is set (i.e.
when a conversion is completed). The interrupt is
masked using the EAI (interrupt mask) bit in the
control register.
6.5µs = 9 x C x ASI
ad
Ω
(capacitor charged to over 99.9%), i.e. 30 k in-
cluding a 50% guardband. ASI can be higher if C
has been charged for a longer period by adding in-
structions before the start of conversion (adding
more than 26 CPU cycles is pointless).
The power consumption of the device can be re-
duced by turning off the ADC peripheral. This is
done by setting the PDS bit in the ADC control reg-
ister to “0”. If PDS=“1”, the A/D is powered and en-
abled for conversion. This bit must be set at least
ad
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ST62T32B ST62E32B
A/D CONVERTER (Cont’d)
Since the ADC is on the same chip as the micro-
processor, the user should not switch heavily load-
ed output signals during conversion, if high preci-
sion is required. Such switching will affect the sup-
ply voltages used as analog references.
A/D Converter Control Register (ADCR)
Address: 0D1h
—
Read/Write
7
0
EAI
EOC
STA
PDS
D3 CLSEL D1
D0
The accuracy of the conversion depends on the
quality of the power supplies (V and V ). The
DD
SS
user must take special care to ensure a well regu-
Bit 7 = EAI: Enable A/D Interrupt.If this bit is set to
“1” the A/D interrupt is enabled, when EAI=0 the
interrupt is disabled.
lated reference voltage is present on the V and
DD
V
pins (power supply voltage variations must be
SS
less than 5V/ms). This implies, in particular, that a
suitable decoupling capacitor is used at the V
EOC
Bit 6 =
: End of conversion. Read Only. This
DD
read only bit indicates when a conversion has
been completed. This bit is automatically reset to
“0” when the STA bit is written. If the user is using
the interrupt option then this bit can be used as an
interrupt pending bit. Data in the data conversion
register are valid only when this bit is set to “1”.
pin.
The converter resolution is given by:
V
DD – VSS
----------------------------
256
STA: Start of Conversion. Write Only. Writ-
Bit 5 =
ing a “1” to this bit will start a conversion on the se-
lected channel and automatically reset to “0” the
EOC bit. If the bit is set again when a conversion is
in progress, the present conversion is stopped and
a new one will take place. This bit is write only, any
attempt to read it will show a logical zero.
The Input voltage (Ain) which is to be converted
must be constant for 1µs before conversion and
remain constant during conversion.
Conversion resolution can be improved if the pow-
er supply voltage (V ) to the microcontroller is
DD
Bit 4 = PDS: Power Down Selection. This bit acti-
vates the A/D converter if set to “1”. Writing a “0” to
this bit will put the ADC in power down mode (idle
mode).
lowered.
In order to optimise conversion resolution, the user
can configure the microcontroller in WAIT mode,
because this mode minimises noise disturbances
and power supply variations due to output switch-
ing. Nevertheless, the WAIT instruction should be
executed as soon as possible after the beginning
of the conversion, because execution of the WAIT
Bit 3 = Reserved. Must be kept cleared
Bit 2= CLSEL: Clock Selection. When set, the
ADC is driven by the MCU internal clock divided by
6, and typical conversion time at 8MHz is 35µs.
When cleared (Reset state), MCU clock divided by
12 is used with a typical 70µs conversion time at
8MHz.
instruction may cause a small variation of the V
DD
voltage. The negative effect of this variation is min-
imized at the beginning of the conversion when the
converter is less sensitive, rather than at the end
of conversion, when the less significant bits are
determined.
Bit 1-0: Reserved. Must be kept cleared.
A/D Converter Data Register (ADR)
The best configuration, from an accuracy stand-
point, is WAIT mode with the Timer stopped. In-
deed, only the ADC peripheral and the oscillator
are then still working. The MCU must be woken up
from WAIT mode by the ADC interrupt at the end
of the conversion. It should be noted that waking
up the microcontroller could also be done using
the Timer interrupt, but in this case the Timer will
be working and the resulting noise could affect
conversion accuracy.
Address: 0D0h
—
Read only
7
0
D7
D6
D5
D4
D3
D2
D1
D0
D7-D0: 8 Bit A/D Conversion Result.
Bit 7-0 =
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4.5 U. A. R. T. (Universal Asynchronous Receiver/Transmitter)
The UART provides the basic hardware for asyn-
chronous serial communication which, combined
with an appropriate software routine, gives a serial
interface providing communication with common
baud rates (up to 38,400 Baud with an 8MHz ex-
ternal oscillator) and flexible character formats.
4.5.1 PORTS INTERFACING
RXD reception line and TXD emission line are
sharing the same external pins as two I/O lines.
Therefore, UART configuration requires to set
these two I/O lines through the relevant ports reg-
isters. The I/O line common with RXD line must be
defined as input mode (with or without pull-up)
while the I/O line common with TXD line must be
defined as output mode (Push-pull or open drain).
The transmitted data is inverted and can therefore
use a single transistor buffering stage. Defined as
input, the RXD line can be read at any time as an
I/O line during the UART operation. The TXD pin
follows I/O port registers value when UARTOE bit
is cleared, which means when no serial transmis-
sion is in progress. As a consequence, a perma-
nent high level has to be written onto the I/O port in
order to achieve a proper stop condition on the
TXD line when no transmission is active.
Operating in Half-Duplex mode only, the UART
uses 11-bit characters comprising 1 start bit, 9 data
bits and 1 Stop bit. Parity is supported by software
only for transmit and for checking the received par-
ity bit (bit 9). Transmitted data is sent directly, while
received data is buffered allowing further data
characters to be received while the data is being
read out of the receive buffer register. Data trans-
mit has priority over data being received.
The UART is supplied with an MCU internal clock
that is alsoavailable inWAITmodeoftheprocessor.
Figure 35. UART Block Diagram
START
DETECTOR
RXD1
UARTOE
TXD
1
DIN
DOUT
DATA SHIFT
REGISTER
MUX
TXD1
DR
0
D8 D7 D6 D5 D4 D3 D2 D1 D0
WRITE
READ
RECEIVE BUFFER
REGISTER
D9
CONTROL REGISTER
BAUD RATE
RX and TX
INTERRUPTS
PROGRAMMABLE
DIVIDER
f
OSC
BAUD RATE x 8
VR02009
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4.5.2 CLOCK GENERATION
The character options are summarised in the fol-
lowing table.
The UART contains a built-in divider of the MCU
internal clock for most common Baud Rates as
shown in Table 20. Other baud rate values can be
calculated from the chosen oscillator frequency di-
vided by the Divisor value shown.
Table 19. Character Options
Start Bit
Start Bit
Start Bit
Start Bit
8 Data
9 Data
8 Data
7 Data
1 Software Parity
No Parity
1 Stop
1 Stop
2 Stop
2 Stop
No Parity
The divided clock provides a frequency that is 8
times the desired baud rate. This allows the Data
reception mechanism to provide a 2 to 1 majority
voting system to determine the logic state of the
asynchronous incoming serial logic bit by taking 3
timed samples within the 8 time states.
1 Software Parity
Bit 9 remains in the state programmed for consec-
utive transmissions until changed by the user or
until a character is received when the state of this
bit is changed to that of the incoming bit 9. The
recommended procedure is thus to set the value of
this bit before transmission is started.
The bits not sampled provide a buffer to compen-
sate for frequency offsets between sender and re-
ceiver.
Transmission is started by writing to the Data Reg-
ister (the Baud Rate and Bit 9 should be set before
this action). The UARTOE signal switches the out-
put multiplexer to the UART output and a start bit
is sent (a 0 for one bit time) followed by the 8 data
values (lsb first) and the value of the Bit9 bit. The
output is then set to 1 for a period of one bit time to
generate a Stop bit, and then the UARTOE signal
returns the TXD1 line to its alternate I/O function.
The end of transmission is flagged by setting
TXMT to 1 and an interrupt is generated if ena-
bled. The TXMT flag is reset by writing a 0 to the
bit position, it is also cleared automatically when a
new character is written to the Data Register.
TXMT can be set to 1 by software to generate a
software interrupt so care must be taken in manip-
ulating the Control Register.
4.5.3 DATA TRANSMISSION
Transmission is fixed to a format of one start bit,
nine data bits and one stop bit. The start and stop
bits are automatically generated by the UART. The
nine databits are under control of the user and are
flexible in use. Bits 0..7 are typically used as data
bits while bit 9 is typically used as parity, but can
also be a 9th data bit or an additional Stop bit. As
parity is not generated by the UART, it should be
calculated by program and inserted in the appro-
priate position of the data (i.e as bit 7 for 7-bit data,
with Bit 9 set to 1 giving two effective stop bits or
as the independent bit 9).
Figure 36. Data Sampling Points
Figure 37. Character Format
START
BIT
STOP
BIT
1 BIT
D0 D1
D7 D8
BIT
POSITION
2
8
9
1
10
POSSIBLE
NEXT
0
1
2
3
4
5
6
7
8
CHARACTER
START
START OF DATA
SAMPLES
VR02010
VR02012
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ST62T32B ST62E32B
4.5.4 DATA RECEPTION
4.5.5 INTERRUPT CAPABILITIES
The UART continuously looks for a falling edge on
the input pin whenever a transmission is not ac-
tive. Once an edge is detected it waits 1 bit time (8
states) to accommodate the Start bit, and then as-
sembles the following serial data stream into the
data register. The data in the ninth bit position is
copied into Bit 9, replacing any previous value set
for transmission. After all 9 bits have been re-
ceived, the Receiver waits for the duration of one
bit (for the Stop bit) and then transfers the received
data into the buffer register, allowing a following
character to be received. The interrupt flag
RXRDY is set to 1 as the data is transferred to the
buffer register and, if enabled, will generate an in-
terrupt.
Both reception and transmission processes can in-
duce interrupt to the core as defined in the inter-
rupt section. These interrupts are enabled by set-
ting TXIEN and RXIEN bit in the UARTCR register,
and TXMT and RXRDY flags are set accordingly
to the interrupt source.
4.5.6 REGISTERS
UART Data Register (UARTDR)
Address: D6h, Read/Write
7
0
D7
D6
D5
D4
D3
D2
D1
D0
Bit7-Bit0. UART data bits. A write to this register
loads the data into the transmit shift register and
triggers the start of transmission. In addition this
resets the transmit interrupt flag TXMT. A read of
this register returns the data from the Receive
buffer.
If a transmission is started during the course of a
reception, the transmission takes priority and the
reception is stopped to free the resources for the
transmission. This implies that a handshaking sys-
tem must be implemented, as polling of the UART
to detect reception is not available.
Warning. No Read/Write Instructions may be
used with this register as both transmit and receive
share the same address
Figure 38. UART Data Output
UARTOE
TXD
1
MUX
0
TXD1
PORT DATA
OUTPUT
VR02011
Table 20. Baud Rate Selection
Baud Rate
BR2
BR2
BR0
f
Division
INT
f
= 8MHz
1200
f
= 4MHz
600
INT
INT
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
6.656
3.328
1.664
832
2400
1200
2400
4800
9600
4800
9600
416
19200
31200
256
15600
19200
208
38400
Reserved
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REGISTERS (Cont’d)
UART Control Register (UARTCR)
Writing to RXIEN does not affect the status of the
interrupt flag RXRDY.
Address: D7h, Read/Write
Bit 4 = TXIEN. Transmit Interrupt Enable. When
this bit is set to 1, the transmit interrupt is enabled.
Writing to TXIEN does not affect the status of the
interrupt flag TXRDY.
7
0
RXRDY TXMT RXIEN TXIEN BR2
BR1
BR0 DAT9
Bit 7 = RXRDY. Receiver Ready. This flag be-
comes active as soon as a complete byte has
been received and copied into the receive buffer. It
may be cleared by writing a zero to it. Writing a
one is possible. If the interrupt enable bit RXIEN is
set to one, a software interrupt will be generated.
BR2..BR0
. Baudrate select. These bits
Bit 3-1=
select the operating baud rate of the UART, de-
pending on the frequency of fOSC. Care should be
taken not to change these bits during communica-
tion as writing to these bits has an immediate ef-
fect.
Bit 6 = TXMT. Transmitter Empty. This flag be-
comes active as soon as a complete byte has
been sent. It may be cleared by writing a zero to it.
It is automatically cleared by the action of writing a
data value into the UART data register.
DAT9
. Parity/Data Bit 9. This bit represents
Bit 0 =
the 9th bit of the data character that is received or
transmitted. A write to this bit sets the level for the
bit 9 to be transmitted, so it must always be set to
the correct level before transmission. If used as
parity, the value has first to be calculated by soft-
ware. Reading this bit will return the 9th bit of the
received character.
Bit 5 = RXIEN. Receive Interrupt Enable. When
this bit is set to 1, the receive interrupt is enabled.
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4.6 SERIAL PERIPHERAL INTERFACE (SPI)
The on-chip SPI is an optimized serial synchro-
nous interface that supports a wide range of indus-
try standard SPI specifications. The on-chip SPI is
controlled by small and simple user software to
perform serial data exchange. The serial shift
clock can be implemented either by software (us-
ing the bit-set and bit-reset instructions), with the
on-chip Timer 1 by externally connecting the SPI
clock pin to the timer pin or by directly applying an
external clock to the Scl line.
operation Sout has to be programmed as open-
drain output.
The SCL, Sin and Sout SPI clock and data signals
are connected to 3 I/O lines on the same external
pins. With these 3 lines, the SPI can operate in the
following operating modes: Software SPI, S-BUS,
I C-bus and as a standard serial I/O (clock, data,
enable). An interrupt request can be generated af-
ter eight clock pulses. Figure 39 shows the SPI
block diagram.
The peripheral is composed by an 8-bit Data/shift
Register and a 4-bit binary counter while the Sin
pin is the serial shift input and Sout is the serial
shift output. These two lines can be tied together
to implement two wires protocols (I C-bus, etc).
When data is serialized, the MSB is the first bit. Sin
has to be programmed as input. For serial output
The SCL line clocks, on the falling edge, the shift
register and the counter. To allow SPI operation in
slave mode, the SCL pin must be programmed as
input and an external clock must be supplied to
this pin to drive the SPI peripheral.
In master mode, SCL is programmed as output, a
clock signal must be generated by software to set
and reset the port line.
Figure 39. SPI Block Diagram
SPI Interrupt Disable Register
Write
SPI Data Register
Read
CLK
RESET
SCL
I/O Port
Data Reg
Direction
Set Res
DIN
Q4
Q4
RESET
4-Bit Counter
CP
(Q4=High after Clock8)
Sin
I/O Port
Data Reg
Direction
Interrupt
Reset
Load
8-Bit Data
Shift Register
CP
DIN
DOUT
Output
Enable
8-Bit Tristate Data I/O
OPR Reg.
Sout
I/O Port
0
1
DOUT
D0............................D 7
to Processor Data Bus
Data Reg
Direction
VR01504
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ST62T32B ST62E32B
SERIAL PERIPHERAL INTERFACE(Cont’d)
After 8 clock pulses (D7..D0) the output Q4 of the
4-bit binary counter becomes low, disabling the
clock from the counter and the data/shift register.
Q4 enables the clock to generate an interrupt on
the 8th clock falling edge as long as no reset of the
counter (processor write into the 8-bit data/shift
register) takes place. After a processor reset the
interrupt is disabled. The interrupt is active when
writing data in the shift register and desactivated
when writing any data in the SPI Interrupt Disable
register.
As it is possible to directly read the Sin pin directly
through the port register, the software can detect a
difference between internal data and external data
(master mode). Similar condition can be applied to
the clock.
Three (Four) Wire Serial Bus
It is possible to use a single general purpose I/O
pin (with the corresponding interrupt enabled) as a
chip enable pin. SCL acts as active or passive
clock pin, Sin as data in and Sout as data out (four
wire bus). Sin and Sout can be connected together
externally to implement three wire bus.
The generation of an interrupt to the Core provides
information that new data is available (input mode)
or that transmission is completed (output mode),
allowing the Core to generate an acknowledge on
the 9th clock pulse (I C-bus).
Note
:
When the SPI is not used, the three I/O lines (Sin,
SCL, Sout) can be used as normal I/O, with the fol-
lowing limitation: bit Sout cannot be used in open
drain mode as this enables the shift register output
to the port.
The interrupt is initiated by a high to low transition,
and therefore interrupt options must be set accord-
ingly as defined in the interrupt section.
It is recommended, in order to avoid spurious in-
terrupts from the SPI, to disable the SPI interrupt
(the default state after reset) i.e. no write must be
made to the 8-bit shift register. An explicit interrupt
disable may be made in software by a dummy
write to the SPI interrupt disable register.
After power on reset, or after writing the data/shift
register, the counter is reset to zero and the clock
is enabled. In this condition the data shift register
is ready for reception. No start condition has to be
detected. Through the user software the Core may
pull down the Sin line (Acknowledge) and slow
down the SCL, as long as it is needed to carry out
data from the shift register.
SPI Data/Shift Register
Address: DDh - Read/Write (SDSR)
I C-bus Master-Slave, Receiver-Transmitter
When pins Sin and Sout are externally connected
together it is possible to use the SPI as a receiver
as well as a transmitter. Through software routine
(by using bit-set and bit-reset on I/O line) a clock
can be generated allowing I C-bus to work in mas-
ter mode.
7
0
D7
D6
D5
D4
D3
D2
D1
D0
A write into this register enables SPI Interrupt after
8 clock pulses.
When implementing an I C-bus protocol, the start
condition can be detected by setting the processor
into a wait for start condition by enabling the inter-
rupt of the I/O port used for the Sin line. This frees
the processor from polling the Sin and SCL lines.
After the transmission/reception the processor has
to poll for the STOP condition.
SPI Interrupt Disable Register
Address: DCh - Read/Write (SIDR)
7
0
In slave mode the user software can slow down
the SCL clock frequency by simply putting the SCL
I/O line in output open-drain mode and writing a
zero into the corresponding data register bit.
D7
D6
D5
D4
D3
D2
D1
D0
A dummy write to this register disables SPI Inter-
rupt.
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ST62T32B ST62E32B
5 SOFTWARE
5.1 ST6 ARCHITECTURE
The ST6 software has been designed to fully use
the hardware in the most efficient way possible
while keeping byte usage to a minimum; in short,
to provide byte efficient programming capability.
The ST6 core has the ability to set or clear any
register or RAM location bit of the Data space with
a single instruction. Furthermore, the program
may branch to a selected address depending on
the status of any bit of the Data space. The carry
bit is stored with the value of the bit when the SET
or RES instruction is processed.
bits of the opcode with the byte following the op-
code. The instructions (JP, CALL) which use the
extended addressing mode are able to branch to
any address of the 4K bytes Program space.
An extended addressing mode instruction is two-
byte long.
Program Counter Relative. The relative address-
ing mode is only used in conditional branch in-
structions. The instruction is used to perform a test
and, if the condition is true, a branch with a span of
-15 to +16 locations around the address of the rel-
ative instruction. If the condition is not true, the in-
struction which follows the relative instruction is
executed. The relative addressing mode instruc-
tion is one-byte long. The opcode is obtained in
adding the three most significant bits which char-
acterize the kind of the test, one bit which deter-
mines whether the branch is a forward (when it is
0) or backward (when it is 1) branch and the four
less significant bits which give the span of the
branch (0h to Fh) which must be added or sub-
tracted to the address of the relative instruction to
obtain the address of the branch.
5.2 ADDRESSING MODES
The ST6 core offers nine addressing modes,
which are described in the following paragraphs.
Three different address spaces are available: Pro-
gram space, Data space, and Stack space. Pro-
gram space contains the instructions which are to
be executed, plus the data for immediate mode in-
structions. Data space contains the Accumulator,
the X,Y,V and W registers, peripheral and In-
put/Output registers, the RAM locations and Data
ROM locations (for storage of tables and con-
stants). Stack space contains six 12-bit RAM cells
used to stack the return addresses for subroutines
and interrupts.
Bit Direct
. In the bit direct addressing mode, the
bit to be set or cleared is part of the opcode, and
the byte following the opcode points to the ad-
dress of the byte in which the specified bit must be
set or cleared. Thus, any bit in the 256 locations of
Data space memory can be set or cleared.
Immediate. In the immediate addressing mode,
the operand of the instruction follows the opcode
location. As the operand is a ROM byte, the imme-
diate addressing mode is used to access con-
stants which do not change during program execu-
tion (e.g., a constant used to initialize a loop coun-
ter).
Bit Test & Branch. The bit test and branch ad-
dressing mode is a combination of direct address-
ing and relative addressing. The bit test and
branch instruction is three-byte long. The bit iden-
tification and the tested condition are included in
the opcode byte. The address of the byte to be
tested follows immediately the opcode in the Pro-
gram space. The third byte is the jump displace-
ment, which is in the range of -127 to +128. This
displacement can be determined using a label,
which is converted by the assembler.
Direct. In the direct addressing mode, the address
of the byte which is processed by the instruction is
stored in the location which follows the opcode. Di-
rect addressing allows the user to directly address
the 256 bytes in Data Space memory with a single
two-byte instruction.
Short Direct
. The core can address the four RAM
Indirect
. In the indirect addressing mode, the byte
registers X,Y,V,W (locations 80h, 81h, 82h, 83h) in
the short-direct addressing mode. In this case, the
instruction is only one byte and the selection of the
location to be processed is contained in the op-
code. Short direct addressing is a subset of the di-
rect addressing mode. (Note that 80h and 81h are
also indirect registers).
processed by the register-indirect instruction is at
the address pointed by the content of one of the in-
direct registers, X or Y (80h,81h). The indirect reg-
ister is selected by the bit 4 of the opcode. A regis-
ter indirect instruction is one byte long.
Inherent. In the inherent addressing mode, all the
information necessary to execute the instruction is
contained in the opcode. These instructions are
one byte long.
Extended. In the extended addressing mode, the
12-bit address needed to define the instruction is
obtained by concatenating the four less significant
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ST62T32B ST62E32B
5.3 INSTRUCTION SET
Load & Store
. These instructions use one, two or
The ST6 core offers a set of 40 basic instructions
which, when combined with nine addressing
modes, yield 244 usable opcodes. They can be di-
vided into six different types: load/store, arithme-
tic/logic, conditional branch, control instructions,
jump/call, and bit manipulation. The following par-
agraphs describe the different types.
three bytes in relation with the addressing mode.
One operand is the Accumulator for LOAD and the
other operand is obtained from data memory using
one of the addressing modes.
For Load Immediate one operand can be any of
the 256 data space bytes while the other is always
immediate data.
All the instructions belonging to a given type are
presented in individual tables.
Table 21. Load & Store Instructions
Flags
Instruction
LD A, X
Addressing Mode
Short Direct
Bytes
Cycles
Z
C
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
1
1
1
1
1
1
1
1
2
2
1
1
1
1
2
3
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
∆
LD A, Y
LD A, V
LD A, W
LD X, A
LD Y, A
Short Direct
Short Direct
Short Direct
Short Direct
Short Direct
Short Direct
Short Direct
Direct
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
LD V, A
LD W, A
LD A, rr
LD rr, A
Direct
LD A, (X)
LD A, (Y)
LD (X), A
LD (Y), A
LDI A, #N
LDI rr, #N
Indirect
Indirect
Indirect
Indirect
∆
Immediate
Immediate
∆
*
Notes:
X,Y. Indirect Register Pointers, V & W Short Direct Registers
# . Immediate data (stored in ROM memory)
rr. Data space register
∆. Affected
* . Not Affected
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ST62T32B ST62E32B
INSTRUCTION SET (Cont’d)
Arithmetic and Logic. These instructions are
used to perform the arithmetic calculations and
logic operations. In AND, ADD, CP, SUB instruc-
tions one operand is always the accumulator while
the other can be either a data space memory con-
tent or an immediate value in relation with the ad-
dressing mode. In CLR, DEC, INC instructions the
operand can be any of the 256 data space ad-
dresses. In COM, RLC, SLA the operand is always
the accumulator.
Table 22. Arithmetic & Logic Instructions
Flags
Instruction
ADD A, (X)
Addressing Mode
Indirect
Bytes
Cycles
Z
∆
∆
∆
∆
∆
∆
∆
∆
∆
*
C
∆
∆
∆
∆
∆
∆
∆
∆
∆
*
1
1
2
2
1
1
2
2
2
3
1
1
1
2
2
1
1
1
1
2
2
1
1
1
1
1
1
2
2
1
1
1
2
1
1
2
2
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
ADD A, (Y)
ADD A, rr
ADDI A, #N
AND A, (X)
AND A, (Y)
AND A, rr
ANDI A, #N
CLR A
Indirect
Direct
Immediate
Indirect
Indirect
Direct
Immediate
Short Direct
Direct
CLR r
COM A
Inherent
Indirect
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
*
CP A, (X)
CP A, (Y)
CP A, rr
CPI A, #N
DEC X
Indirect
Direct
Immediate
Short Direct
Short Direct
Short Direct
Short Direct
Direct
DEC Y
*
DEC V
*
DEC W
*
DEC A
*
DEC rr
Direct
*
DEC (X)
DEC (Y)
INC X
Indirect
*
Indirect
*
Short Direct
Short Direct
Short Direct
Short Direct
Direct
*
INC Y
*
INC V
*
INC W
*
INC A
*
INC rr
Direct
*
INC (X)
Indirect
*
INC (Y)
Indirect
*
RLC A
Inherent
Inherent
Indirect
∆
∆
∆
∆
∆
∆
SLA A
SUB A, (X)
SUB A, (Y)
SUB A, rr
SUBI A, #N
Indirect
Direct
Immediate
Notes:
X,Y.Indirect Register Pointers, V & W Short Direct RegistersD. Affected
# . Immediate data (stored in ROM memory)* . Not Affected
rr. Data space register
67/86
171
ST62T32B ST62E32B
INSTRUCTION SET (Cont’d)
Conditional Branch. The branch instructions
achieve a branch in the program when the select-
ed condition is met.
Control Instructions. The control instructions
control the MCU operations during program exe-
cution.
Bit Manipulation Instructions. These instruc-
tions can handle any bit in data space memory.
One group either sets or clears. The other group
(see Conditional Branch) performs the bit test
branch operations.
Jump and Call. These two instructions are used
to perform long (12-bit) jumps or subroutines call
inside the whole program space.
Table 23. Conditional Branch Instructions
Flags
Instruction
Branch If
Bytes
Cycles
Z
*
*
*
*
*
*
C
*
JRC e
C = 1
1
1
1
1
3
3
2
2
2
2
5
5
JRNC e
C = 0
Z = 1
Z = 0
Bit = 0
Bit = 1
*
JRZ e
*
JRNZ e
*
JRR b, rr, ee
JRS b, rr, ee
∆
∆
Notes
:
b.
e.
3-bit address
rr. Data space register
∆ . Affected. The tested bit is shifted into carry.
5 bit signed displacement in the range -15 to +16<F128M>
ee. 8 bit signed displacement in the range -126 to +129
* . Not Affected
Table 24. Bit Manipulation Instructions
Flags
Instruction
Addressing Mode
Bytes
Cycles
Z
C
*
SET b,rr
Bit Direct
Bit Direct
2
2
4
4
*
*
RES b,rr
*
Notes:
b.
3-bit address;
* . Not<M> Affected
rr. Data space register;
Table 25. Control Instructions
Flags
Instruction
Addressing Mode
Bytes
Cycles
Z
*
C
*
NOP
Inherent
Inherent
Inherent
Inherent
Inherent
1
1
1
1
1
2
2
2
2
2
RET
*
*
RETI
∆
*
∆
*
STOP (1)
WAIT
*
*
Notes:
1.
This instruction is deactivated<N>and a WAIT is automatically executed instead of a STOP if the watchdog function is selected.
∆ . Affected
*.
Not Affected
Table 26. Jump & Call Instructions
Instruction
Flags
Addressing Mode
Bytes
Cycles
Z
*
C
*
CALL abc
JP abc
Extended
Extended
2
2
4
4
*
*
Notes:
abc. 12-bit address;
* . Not Affected
68/86
172
ST62T32B ST62E32B
Opcode Map Summary.The following table contains an opcode map for the instructions used by the ST6
LOW
LOW
0
0000
1
0001
2
0010
3
0011
4
0100
5
6
7
0101
0110
0111
HI
HI
2
JRNZ 4
CALL 2
abc
ext 1
CALL 2
abc
ext 1
CALL 2
abc
ext 1
CALL 2
abc
ext 1
CALL 2
abc
ext 1
CALL 2
abc
ext 1
CALL 2
abc
ext 1
CALL 2
abc
ext 1
CALL 2
abc
ext 1
CALL 2
abc
ext 1
CALL 2
abc
ext 1
CALL 2
abc
ext 1
CALL 2
abc
ext 1
CALL 2
abc
ext 1
CALL 2
abc
ext 1
CALL 2
abc
JRNC 5
e
JRR
b0,rr,ee
2
1
JRZ
2
JRC 4
LD
0
0
e
e
e
e
e
e
e
e
e
e
e
#
x
e
e
e
e
e
e
e
e
e
e
e
e
e
e
e
e
a,(x)
0000
0000
1
2
pcr 2
JRNZ 4
pcr
3
bt
pcr
JRZ 4
1
prc
1
ind
LDI
JRNC 5
e
JRS 2
b0,rr,ee
bt
JRR
b4,rr,ee
bt
JRS 2
b4,rr,ee
INC 2
JRC 4
1
0001
1
a,nn
0001
1
2
pcr 2
JRNZ 4
pcr
3
1
2
pcr
JRZ
1
sd 1
2
prc
2
imm
CP
JRNC 5
e
JRC 4
2
0010
2
#
a,(x)
0010
1
2
pcr 2
JRNZ 4
pcr
3
1
pcr
JRZ 4
1
prc
1
ind
CPI
JRNC 5
e
LD 2
JRC 4
3
0011
3
e
1
2
a,x
#
a,nn
0011
1
2
pcr 2
JRNZ 4
pcr
3
bt
JRR
b2,rr,ee
pcr
JRZ
1
sd 1
2
prc
2
imm
ADD
a,(x)
JRNC 5
e
JRC 4
4
0100
4
e
e
e
e
e
e
e
e
e
e
e
e
0100
1
2
pcr 2
JRNZ 4
pcr
3
bt
1
pcr
JRZ 4
1
prc
1
ind
ADDI
JRNC 5
e
JRS 2
b2,rr,ee
bt
JRR
b6,rr,ee
INC 2
JRC 4
5
0101
5
y
a,nn
0101
1
2
pcr 2
JRNZ 4
pcr
3
1
2
pcr
JRZ
1
sd 1
2
prc
2
imm
INC
JRNC 5
e
JRC 4
6
0110
6
#
(x)
#
0110
1
2
pcr 2
JRNZ 4
pcr
3
bt
1
pcr
JRZ 4
1
prc
1
ind
JRNC 5
e
JRS 2
b6,rr,ee
bt
JRR
b1,rr,ee
LD 2
JRC
7
0111
7
a,y
#
0111
1
2
pcr 2
JRNZ 4
e
pcr
3
1
2
pcr
JRZ
1
sd 1
2
prc
JRC 4
JRNC 5
e
LD
ind
8
1000
8
(x),a
#
1000
1
2
pcr 2
pcr
3
bt
1
pcr
JRZ 4
1
prc 1
JRC
RNZ
e
4
JRNC 5
e
JRS 2
b1,rr,ee
bt
JRR
b5,rr,ee
INC 2
9
1001
9
v
1001
1
2
pcr 2
JRNZ 4
pcr
3
1
2
pcr
JRZ
1
sd 1
2
prc
JRC 4
JRNC 5
e
AND
a,(x)
A
1010
A
1010
e
e
e
e
e
e
#
1
2
pcr 2
JRNZ 4
pcr
3
bt
1
pcr
JRZ 4
1
prc
1
ind
ANDI
JRNC 5
e
JRS 2
b5,rr,ee
bt
JRR
b3,rr,ee
LD 2
JRC 4
B
1011
B
1011
a,v
#
a,nn
1
2
pcr 2
JRNZ 4
pcr
3
1
2
pcr
JRZ
1
sd 1
2
prc
2
imm
SUB
JRNC 5
e
JRC 4
C
1100
C
1100
a,(x)
1
2
pcr 2
JRNZ 4
pcr
3
bt
1
pcr
JRZ 4
1
prc
1
ind
SUBI
JRNC 5
e
JRS 2
b3,rr,ee
bt
JRR
b7,rr,ee
INC 2
JRC 4
D
1101
D
1101
w
a,nn
1
2
pcr 2
JRNZ 4
pcr
3
1
2
pcr
JRZ
1
sd 1
2
prc
2
imm
DEC
JRNC 5
e
JRC 4
E
1110
E
1110
#
(x)
#
1
2
pcr 2
JRNZ 4
pcr
3
bt
1
pcr
JRZ 4
1
prc
1
ind
JRNC 5
e
JRS 2
b7,rr,ee
LD 2
JRC
F
1111
F
1111
a,w
1
pcr 2
ext 1
pcr
3
bt
1
pcr
1
sd 1
prc
Abbreviations for Addressing Modes: Legend:
dir
sd
Direct
Short Direct
#
e
b
rr
nn
abc
ee
Indicates Illegal Instructions
5 Bit Displacement
3 Bit Address
1byte dataspace address
1 byte immediate data
12 bit address
Cycle
Mnemonic
2
1
JRC
prc
Operand
imm Immediate
e
inh
ext
b.d
bt
Inherent
Extended
Bit Direct
Bit Test
Bytes
Addressing Mode
8 bit Displacement
pcr
ind
Program Counter Relative
Indirect
69/86
173
ST62T32B ST62E32B
Opcode Map Summary(Continued)
LOW
LOW
8
1000
9
1001
A
1010
B
1011
C
1100
D
1101
E
1110
F
1111
HI
HI
2
JRNZ 4
JP
2
JRNC 4
e
RES 2
b0,rr
b.d 1
SET 2
b0,rr
b.d 1
RES 2
b4,rr
JRZ 4
LDI
2
JRC 4
LD
0
0
e
e
e
e
e
e
e
e
abc
abc
abc
abc
abc
abc
abc
abc
abc
abc
abc
abc
abc
abc
abc
abc
e
e
e
rr,nn
e
e
e
e
e
e
e
e
e
e
e
e
e
e
e
e
a,(y)
a,rr
0000
0000
1
2
pcr 2
JRNZ 4
ext 1
JP
pcr
2
pcr
3
imm 1
DEC 2
prc
1
ind
LD
2
JRNC 4
e
JRZ 4
JRC 4
1
0001
1
x
0001
1
2
pcr 2
JRNZ 4
ext 1
JP
pcr
2
pcr
1
sd 1
COM 2
prc
2
dir
CP
2
JRNC 4
e
JRZ 4
JRC 4
2
0010
2
a
a,(y)
a,rr
0010
1
2
pcr 2
JRNZ 4
ext 1
JP
pcr
2
b.d 1
SET 2
pcr
JRZ 4
1
prc
1
ind
CP
2
JRNC 4
e
LD 2
JRC 4
3
0011
3
b4,rr
e
b.d 1
x,a
0011
1
2
pcr 2
JRNZ 4
ext 1
JP
pcr
2
pcr
1
sd 1
RETI 2
prc
2
dir
ADD
a,(y)
2
JRNC 4
e
RES 2
b2,rr
b.d 1
SET 2
b2,rr
b.d 1
RES 2
b6,rr
b.d 1
SET 2
b6,rr
b.d 1
RES 2
b1,rr
b.d 1
SET 2
b1,rr
b.d 1
RES 2
b5,rr
b.d 1
SET 2
b5,rr
b.d 1
RES 2
b3,rr
b.d 1
SET 2
b3,rr
b.d 1
RES 2
b7,rr
b.d 1
SET 2
b7,rr
JRZ 2
JRC 4
4
0100
4
e
e
e
e
e
e
e
e
e
e
e
e
0100
1
2
pcr 2
JRNZ 4
ext 1
JP
pcr
2
pcr
1
inh 1
DEC 2
prc
1
ind
ADD
2
JRNC 4
e
JRZ 4
JRC 4
5
0101
5
y
a,rr
(y)
rr
0101
1
2
pcr 2
JRNZ 4
ext 1
JP
pcr
2
pcr
1
sd 1
STOP 2
prc
2
dir
INC
2
JRNC 4
e
JRZ 2
JRC 4
6
0110
6
0110
1
2
pcr 2
JRNZ 4
ext 1
JP
pcr
2
pcr
1
inh 1
LD 2
prc
1
ind
INC
2
JRNC 4
e
JRZ 4
JRC 4
7
0111
7
y,a
0111
1
2
pcr 2
JRNZ 4
e
ext 1
JP
pcr
2
pcr
1
sd 1
2
prc
2
dir
LD
2
JRNC 4
e
JRZ
JRC 4
8
1000
8
#
v
(y),a
rr,a
1000
1
2
pcr 2
ext 1
JP
pcr
2
pcr
JRZ 4
1
prc
1
ind
LD
RNZ
e
4
2
JRNC 4
e
DEC 2
JRC 4
9
1001
9
1001
1
2
pcr 2
JRNZ 4
ext 1
JP
pcr
2
pcr
1
sd 1
RCL
prc
2
dir
AND
a,(y)
2
JRNC 4
e
JRZ 4
2
JRC 4
A
1010
A
1010
e
e
e
e
e
e
a
1
2
pcr 2
JRNZ 4
ext 1
JP
pcr
2
pcr
1
inh 1
LD 2
prc
1
ind
AND
2
JRNC 4
e
JRZ 4
JRC 4
B
1011
B
1011
v,a
a,rr
1
2
pcr 2
JRNZ 4
ext 1
JP
pcr
2
pcr
1
sd 1
RET
prc
2
dir
SUB
2
JRNC 4
e
JRZ 2
2
JRC 4
C
1100
C
1100
a,(y)
1
2
pcr 2
JRNZ 4
ext 1
JP
pcr
2
pcr
1
inh 1
DEC 2
prc
1
ind
SUB
2
JRNC 4
e
JRZ 4
JRC 4
D
1101
D
1101
w
a,rr
(y)
rr
1
2
pcr 2
JRNZ 4
ext 1
JP
pcr
2
pcr
1
sd 1
WAIT 2
prc
2
dir
DEC
2
JRNC 4
e
JRZ 2
JRC 4
E
1110
E
1110
1
2
pcr 2
JRNZ 4
ext 1
JP
pcr
2
pcr
1
inh 1
LD 2
prc
1
ind
DEC
2
JRNC 4
e
JRZ 4
JRC 4
F
1111
F
1111
w,a
1
pcr 2
ext 1
pcr
2
b.d 1
pcr
1
sd 1
prc
2
e
dir
Abbreviations for Addressing Modes: Legend:
dir
sd
Direct
#
e
b
rr
nn
abc
ee
Indicates Illegal Instructions
5 Bit Displacement
3 Bit Address
1byte dataspace address
1 byte immediate data
12 bit address
Cycle
Mnemonic
2
Short Direct
imm Immediate
JRC
prc
Operand
inh
ext
b.d
bt
Inherent
Extended
Bit Direct
1
Bytes
Addressing Mode
Bit Test
8 bit Displacement
pcr
ind
Program Counter Relative
Indirect
70/86
174
ST62T32B ST62E32B
6 ELECTRICAL CHARACTERISTICS
6.1 ABSOLUTE MAXIMUM RATINGS
This product contains devices to protect the inputs
against damage due to high static voltages, how-
ever it is advisable to take normal precaution to
avoid application of any voltage higher than the
specified maximum rated voltages.
Power Considerations.The average chip-junc-
tion temperature, Tj, in Celsius can be obtained
from:
Tj=TA + PD x RthJA
Where:TA = Ambient Temperature.
For proper operation it is recommended that V
I
RthJA =Package thermal resistance(junc-
tion-to ambient).
and V be higher than V and lower than V .
O
SS
DD
Reliability is enhanced if unused inputs are con-
nected to an appropriate logic voltage level (V
PD = Pint + Pport.
DD
or V ).
SS
Pint =I x V (chip internal power).
DD
DD
Pport =Port power dissipation (determined
by the user).
Symbol
Parameter
Value
Unit
V
V
Supply Voltage
Input Voltage
Output Voltage
-0.3 to 7.0
DD
(1)
(1)
V
V
V
- 0.3 to V
+ 0.3
+ 0.3
V
I
SS
SS
DD
DD
V
- 0.3 to V
V
O
I
IV
IV
Current Drain per Pin Excluding V , V
10
mA
mA
mA
°C
°C
±
O
DD SS
Total Current into V (source)
50
50
DD
SS
DD
Total Current out of V (sink)
SS
Tj
Junction Temperature
Storage Temperature
150
T
-60 to 150
STG
Notes:
-
Stresses above those listed as “absolute maximum ratings” may cause permanent damage to the device. This is a stress ratingonly and
functional operation of the device at these conditions is not implied. Exposure to maximum rating conditions for extended periods may
affect device reliability.
- (1) Withinthese limits,clamping diodes are guarantee to be not conductive. Voltages outside these limits are authorised as long as injection
current is kept within the specification.
71/86
175
ST62T32B ST62E32B
6.2 RECOMMENDED OPERATING CONDITIONS
Value
Typ.
Symbol
Parameter
Test Conditions
6 Suffix Version
1 Suffix Version
3 Suffix Version
Unit
Min.
Max.
-40
0
-40
85
70
125
TA
Operating Temperature
°C
V
f
= 2MHz
3.0
4.5
6.0
6.0
OSC
VDD
Operating Supply Voltage
fosc= 8MHz
V
V
V
= 3V
= 4.5V, 1 & 6 Suffix
= 4.5V, 3 Suffix
0
0
0
4.0
8.0
4.0
DD
DD
DD
2)
f
Oscillator Frequency
MHz
OSC
Internal Frequency with OSG
enable
V
V
= 3V
= 4.5V
2
4
f
DD
DD
OSC
f
MHz
2)
OSG
f
OSC
IINJ+
IINJ-
Pin Injection Current (positive) VDD = 4.5 to 5.5V
Pin Injection Current (negative) VDD = 4.5 to 5.5V
+5
-5
mA
mA
Notes:
1. Care must be taken in case of negative current injection, where adapted impedance must be respected on analog sources to not affect the
A/D conversion. For a -1mA injection, a maximum 10 KΩ is recommended.
2. An oscillator frequency above 1MHz is recommended for reliable A/D results.
Figure 40. Maximum Operating Frequency (F ) versus Supply Voltage (V )
DD
max
Maximum FREQUENCY (MHz)
8
7
6
5
4
3
2
1
FUNCTIONALITY IS NOT
GUARANTEED IN
THIS AREA
1 & 6 Suffix Version
3 Suffix Version
f
Min
OSG
2.5
3
3.5
4
4.5
5
5.5
6
SUPPLY VOLTAGE (V )
DD
The shaded area is outside the recommended operating range; device functionality is not guaranteed under these conditions.
72/86
176
ST62T32B ST62E32B
6.3 DC ELECTRICAL CHARACTERISTICS
(T = -40 to +125°C unless otherwise specified)
A
Value
Unit
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
V
Input Low Level Voltage
All Input pins
IL
V
x 0.3
V
V
DD
V
Input High Level Voltage
All Input pins
IH
V
x 0.7
DD
(1)
Hysteresis Voltage
All Input pins
V
V
= 5V
= 3V
0.2
0.2
DD
DD
V
V
V
Hys
Low Level Output Voltage
All Output pins
V
V
= 5.0V; I = +10µA
0.1
0.8
DD
DD
OL
= 5.0V; I = + 3mA
OL
V
V
V
V
= 5.0V; I = +10µA
0.1
0.8
1.3
OL
DD
DD
DD
OL
Low Level Output Voltage
20 mA Sink I/O pins
= 5.0V; I = +7mA
OL
= 5.0V; I = +15mA
OL
V
High Level Output Voltage
All Output pins
V
V
= 5.0V; I = -10µA
4.9
3.5
OH
DD
DD
OL
V
= 5.0V; I = -3.0mA
OL
All Input pins
RESET pin
40
100
350
200
900
R
Pull-up Resistance
ΚΩ
PU
150
Input Leakage Current
All Input pins but RESET
V
V
= V (No Pull-Up configured)
SS
IN
IN
0.1
-16
1.0
= V
I
I
DD
IL
A
µ
Input Leakage Current
RESET pin
V
V
= V
= V
-8
-30
10
IH
IN
IN
SS
DD
Supply Current in RESET
Mode
V
=V
RESET SS
7
7
mA
mA
mA
µA
f
=8MHz
OSC
Supply Current in
V
V
=5.0V f =8MHz, T < 85°C
(2)
DD
INT
A
RUN Mode
I
DD
Supply Current in WAIT
=5.0V
f
=8MHz, T < 85°C
2
(3)
DD
INT
A
Mode
Supply Current in STOP
I
V
= 0mA
= 5.0V
LOAD
20
(3)
Mode
DD
Notes:
(1) Hysteresis voltage between switching levels
(2) All peripherals running
(3) All peripherals in stand-by
(T = -40 to +85°C unless otherwise specified)
A
Value
Typ.
Symbol
Parameter
Test Conditions
Unit
V
Min.
Max.
0.1
0.8
Low Level Output Voltage
All Output pins
V
V
= 5.0V; I = +10µA
DD
DD
OL
= 5.0V; I = + 5mA
OL
V
V
V
V
= 5.0V; I = +10µA
0.1
0.8
1.3
OL
DD
DD
DD
OL
Low Level Output Voltage
20 mA Sink I/O pins
= 5.0V; I = +10mA
OL
= 5.0V; I = +20mA
OL
V
I
High Level Output Voltage
All Output pins
V
V
= 5.0V; I = -10µA
4.9
3.5
OH
DD
DD
OL
V
= 5.0V; I = -5.0mA
OL
Supply Current in STOP
Mode
I
= 0mA
= 5.0V
LOAD
10
A
µ
DD
V
DD
73/86
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ST62T32B ST62E32B
6.4 AC ELECTRICAL CHARACTERISTICS
(T = -40 to +125°C unless otherwise specified)
A
Value
Typ.
Symbol
Parameter
Test Conditions
Unit
ms
Min.
100
Max.
(1)
t
Supply Recovery Time
REC
Minimum Pulse Width (V = 5V)
RESET pin
NMI pin
DD
T
100
100
ns
WR
TA = 25°C
TA = 85°C
TA = 125°C
5
10
20
10
20
30
T
EEPROM Write Time
ms
WEE
Endurance EEPROM WRITE/ERASE Cycle
Retention EEPROM Data Retention
QA LOT Acceptance
TA = 55°C
300,000 1 million
10
cycles
years
pF
C
Input Capacitance
Output Capacitance
All Inputs Pins
All Outputs Pins
10
10
IN
C
pF
OUT
Note:
1. Period for which V has to be connected at 0V to allow internal Reset function at next power-up.
DD
6.5 A/D CONVERTER CHARACTERISTICS
(T = -40 to +125°C unless otherwise specified)
A
Value
Typ.
8
Symbol
Parameter
Test Conditions
Unit
Min.
Max.
Res
Resolution
Total Accuracy
Bit
f
> 1.2MHz
> 32kHz
±2
±4
(1) (2)
OSC
A
LSB
TOT
f
OSC
f
= 8MHz, T < 85°C
= 4MHz
70
140
OSC
A
t
Conversion Time
Zero Input Reading
Full Scale Reading
µs
C
f
OSC
Conversion result when
= V
ZIR
00
Hex
Hex
V
IN
SS
Conversion result when
V
FSR
FF
= V
IN
DD
Analog Input Current During
Conversion
AD
V
= 4.5V
1.0
5
A
µ
I
DD
AC
Analog Input Capacitance
2
pF
IN
Notes:
1. Noise at AV , AV <10mV
DD
SS
2. With oscillator frequencies less than 1MHz, the A/D Converter accuracy is decreased.
74/86
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ST62T32B ST62E32B
6.6 TIMER CHARACTERISTICS
(T = -40 to +125°C unless otherwise specified)
A
Value
Unit
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
f
Input Frequency on TIMER Pin
Pulse Width at TIMER Pin
MHz
IN
V
V
= 3.0V
1
125
µs
ns
DD
DD
t
W
>
4.5V
6.7 SPI CHARACTERISTICS
(T = -40 to +125°C unless otherwise specified)
A
Value
Symbol
Parameter
Test Conditions
Unit
Min.
Typ.
Max.
F
Clock Frequency
Set-up Time
Hold Time
Applied on Scl
Applied on Sin
Applied on Sin
1
MHz
ns
CL
t
50
SU
t
100
ns
h
6.8 ARTIMER16 ELECTRICAL CHARACTERISTICS
(T = -40 to +125°C unless otherwise specified)
A
Value
Typ
Symbol
Parameter
Test Conditions
Unit
Min
Max
f
Input Frequency on CP1, CP2 Pins
Pulse Width at CP1, CP2 Pins
MHz
IN
V
V
= 3.0V
1
125
s
µ
ns
DD
DD
t
W
>
4.5V
75/86
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ST62T32B ST62E32B
7 GENERAL INFORMATION
7.1 PACKAGE MECHANICAL DATA
Figure 41. 42-Pin Plastic Shrink Dual-In-Line Package
mm
Min Typ Max Min Typ Max
5.08 0.200
inches
Dim.
A
A1
0.51
0.020
A2 3.05 3.81 4.57 0.120 0.150 0.180
b
b2
C
0.46 0.56
1.02 1.14
0.018 0.022
0.040 0.045
0.23 0.25 0.38 0.009 0.010 0.015
36.58 36.83 37.08 1.440 1.450 1.460
D
E
15.24
16.00 0.600
0.630
E1 12.70 13.72 14.48 0.500 0.540 0.570
e
1.78
0.070
0.600
eA
eB
eC
L
15.24
18.54
0.730
0.060
1.52 0.000
PDIP42S
2.54 3.30 3.56 0.100 0.130 0.140
Number of Pins
N
42
Figure 42. 52-Pin Plastic Quad Flat Package
mm
Min Typ Max Min Typ Max
3.40 0.134
inches
Dim
A
A1 0.25
0.010
A2 2.55 2.80 3.05 0.100 0.110 0.120
B
C
0.35
0.13
0.50 0.014
0.23 0.005
0.020
0.009
D
16.95 17.20 17.45 0.667 0.677 0.687
13.90 14.00 14.10 0.547 0.551 0.555
D1
D3
E
12.00
0.472
16.95 17.20 17.45 0.667 0.677 0.687
13.90 14.00 14.10 0.547 0.551 0.555
E1
E3
e
12.00
1.00
0.472
0.039
K
0°
0.65 0.80 0.95 0.026 0.031 0.037
1.60 0.063
7°
0°
7°
L
L1
M
PQFP52
Number of Pins
52
N
76/86
180
ST62T32B ST62E32B
PACKAGE MECHANICAL DATA(Cont’d)
Figure 43. 42-Pin Ceramic Shrink Dual-In-Line Package
mm
Min Typ Max Min Typ Max
4.01 0.158
inches
Dim.
A
A1 0.76
0.030
B
0.38 0.46 0.56 0.015 0.018 0.022
B1 0.76 0.89 1.02 0.030 0.035 0.040
C
D
0.23 0.25 0.38 0.009 0.010 0.015
36.68 37.34 38.00 1.444 1.470 1.496
D1
E1
e
35.56
14.48 14.99 15.49 0.570 0.590 0.610
1.78 0.070
1.400
G
14.12 14.38 14.63 0.556 0.566 0.576
18.69 18.95 19.20 0.736 0.746 0.756
G1
G2
1.14
0.045
G3 11.05 11.30 11.56 0.435 0.445 0.455
G4
L
15.11 15.37 15.62 0.595 0.605 0.615
2.92
5.08 0.115
0.200
CDIP42SW
S
0.89
0.035
Number of Pins
N
42
THERMAL CHARACTERISTIC
Value
Typ.
Symbol
Parameter
Test Conditions
Unit
Min.
Max.
70
SDIP42
QFP52
RthJA
Thermal Resistance
°C/W
70
77/86
181
ST62T32B ST62E32B
7.2 ORDERING INFORMATION
Table 27. OTP/EPROM VERSION ORDERING INFORMATION
Program
Sales Type
I/O
Temperature Range
Package
SDIP42W
SDIP42W
Memory (Bytes)
ST62E32BF1
7948 (EPROM)
0 to 70°C
ST62T32BB6
ST62T32BB3
-40 to 85°C
30
-40 to 125°C
7948 (OTP)
ST62T32BQ6
ST62T32BQ3
-40 to 85°C
PQFP52
-40 to 125°C
78/86
182
ST62P32B
8-BIT FASTROM MCUs WITH A/D CONVERTER,
16 bit AUTO-RELOAD TIMER, EEPROM, SPI AND UART
■ 3.0 to 6.0V Supply Operating Range
■ 8 MHz Maximum Clock Frequency
■
-40 to +125°C Operating Temperature Range
■
Run, Wait and Stop Modes
■ 5 Interrupt Vectors
■ Look-up Table capability in Program Memory
■
Data Storage in Program Memory:
User selectable size
■ Data RAM: 192 bytes
■ Data EEPROM: 128 bytes
PSDIP42
■
30 I/O pins, fully programmable as:
– Input with pull-up resistor
– Input without pull-up resistor
– Input with interrupt generation
– Open-drain or push-pull output
– Analog Input
■ 9 I/O lines can sink up to 20mA to drive LEDs or
TRIACs directly
■ 8-bit Timer/Counter with 7-bit programmable
prescaler
■ 16-bit
Auto-reload
Timer
with
7-bit
programmable prescaler (AR Timer)
■ Digital Watchdog
PQFP52
■
8-bit A/D Converter with 21 analog inputs
■ 8-bit Synchronous Peripheral Interface (SPI)
■ 8-bit Asynchronous Peripheral Interface
(UART)
(See end of Datasheet for Ordering Information)
■
On-chip Clock oscillator can be driven by Quartz
Crystal or Ceramic resonator
■ Oscillator Safe Guard
■
One external Non-Maskable Interrupt
■
ST623x-EMU2 Emulation and Development
System (connects to an MS-DOS PC via a
parallel port).
DEVICE SUMMARY
ROM
DEVICE
I/O Pins
(Bytes)
ST62P32B
7948
30
Rev. 2.5
September 1998
79/86
183
ST62P32B
from it. This listing refers exactly to the ROM con-
tents and options which will be used to produce
the specified MCU. The listing is then returned to
the customer who must thoroughly check, com-
plete, sign and return it to STMicroelectronics. The
signed listing forms a part of the contractual agree-
ment for the production of the specific customer
MCU.
1 GENERAL DESCRIPTION
1.1 INTRODUCTION
The ST62P32B is the Factory Advanced Service
T
echnique ROM (FASTROM) versions of
ST62T32B OTP devices.
They offer the same functionality as OTP devices,
selecting as FASTROM options the options de-
fined in the programmable option byte of the OTP
version.
The STMicroelectronics Sales Organization will be
pleased to provide detailed information on con-
tractual points.
Table 1. ROM Memory Map for ST62P32B
1.2 ORDERING INFORMATION
ROM Page Device Address
Description
The following section deals with the procedure for
transfer of customer codes to STMicroelectronics.
0000h-007Fh
Page 0
Reserved
User ROM
0080h-07FFh
1.2.1 Transfer of Customer Code
0800h-0F9Fh
0FA0h-0FEFh
0FF0h-0FF7h
0FF8h-0FFBh
0FFCh-0FFDh
0FFEh-0FFFh
User ROM
Reserved
Interrupt Vectors
Reserved
NMI Vector
Reset Vector
Customer code is made up of the ROM contents
and the list of the selected FASTROM options.
The ROM contents are to be sent on diskette, or
by electronic means, with the hexadecimal file
generated by the development tool. All unused
bytes must be set to FFh.
Page 1
“STATIC”
0000h-000Fh
0010h-07FFh
Reserved
User ROM
Page 2
Page 3
The selected options are communicated to STMi-
croelectronics using the correctly filled OPTION
LIST appended.
0000h-000Fh
0010h-07FFh
Reserved
User ROM
1.2.2 Listing Generation and Verification
When STMicroelectronics receives the user’s
ROM contents, a computer listing is generated
Table 2. FASTROM version Ordering Information
Sales Type
ROM
I/O
Temperature Range
Package
ST62P32BB1/XXX
ST62P32BB6/XXX
ST62P32BB3/XXX (*)
0 to +70°C
-40 to 85°C
-40 to 125°C
SDIP42
7948
30
ST62P32BQ1/XXX
ST62P32BQ6/XXX
ST62P32BQ3/XXX (*)
0 to +70°C
-40 to 85°C
-40 to 125°C
PQFP52
(*) Advanced information
80/86
184
ST62P32B
ST62P32B FASTROMMICROCONTROLLER OPTION LIST
Customer
Address
Contact
Phone No
Reference
STMicroelectronics references
Device:
[ ] ST62P32B
Package:
[ ] Dual in Line Plastic[ ] Plastic Quad Flat (Tape & Reel)
[ ] 0°C to + 70°C[ ] - 40°C to + 85°C
[ ] Software Activation
Temperature Range:
Watchdog Selection:
[ ] Hardware Activation
Ports Pull-Up Selection: [ ] Yes [ ] No
NMI Pull-Up Selection: [ ] Yes [ ] No
Timer Pull-Up Selection: [ ] Yes [ ] No
External STOP Mode Control:[ ] Enabled
[ ] Disabled
OSG:
[ ] Enabled
[ ] Disabled
Readout Protection:
Comments :
[ ] Standard
[ ] Enabled
Supply Operating Range in the application:
Oscillator Fequency in the application:
Notes
. . . . . . . . . . . . . . . . . .
Signature
Date
81/86
185
ST62P32B
Notes:
82/86
186
ST6232B
8-BIT MCUs WITH A/D CONVERTER,
16 bit AUTO-RELOAD TIMER, EEPROM, SPI AND UART
■ 3.0 to 6.0V Supply Operating Range
■ 8 MHz Maximum Clock Frequency
■
-40 to +125°C Operating Temperature Range
■
Run, Wait and Stop Modes
■ 5 Interrupt Vectors
■ Look-up Table capability in Program Memory
■
Data Storage in Program Memory:
User selectable size
■ Data RAM: 192 bytes
■ Data EEPROM: 128 bytes
PSDIP42
■
30 I/O pins, fully programmable as:
– Input with pull-up resistor
– Input without pull-up resistor
– Input with interrupt generation
– Open-drain or push-pull output
– Analog Input
■ 9 I/O lines can sink up to 20mA to drive LEDs or
TRIACs directly
■ 8-bit Timer/Counter with 7-bit programmable
prescaler
■ 16-bit
Auto-reload
Timer
with
7-bit
programmable prescaler (AR Timer)
■ Digital Watchdog
PQFP52
■
8-bit A/D Converter with 21 analog inputs
■ 8-bit Synchronous Peripheral Interface (SPI)
■ 8-bit Asynchronous Peripheral Interface
(UART)
(See end of Datasheet for Ordering Information)
■
On-chip Clock oscillator can be driven by Quartz
Crystal or Ceramic resonator
■ Oscillator Safe Guard
■
One external Non-Maskable Interrupt
■
ST623x-EMU2 Emulation and Development
System (connects to an MS-DOS PC via a
parallel port).
DEVICE SUMMARY
ROM
DEVICE
I/O Pins
(Bytes)
ST6232B
7948
30
Rev. 2.5
September 1998
83/86
187
ST6232B
1 GENERAL DESCRIPTION
1.1 INTRODUCTION
1.2 ROM READOUT PROTECTION
The ST6232B is mask programmed ROM version
of ST62T32B OTP devices.
If the ROM READOUT PROTECTION option is
selected, a protection fuse can be blown to pre-
vent any access to the program memory content.
They offer the same functionality as OTP devices,
selecting as ROM options the options defined in
the programmable option byte of the OTP version.
In case the user wants to blow this fuse, high volt-
age must be applied on the TEST pin.
Figure 1. Programming wave form
Figure 2. Programming Circuit
0.5s min
TEST
5V
47mF
15
14V typ
10
100nF
5
V
SS
V
DD
TEST
150 µs typ
PROTECT
100mA
max
14V
TEST
100nF
ZPD15
15V
VR02003
4mA typ
t
VR02001
Note: ZPD15is used for overvoltage protection
84/86
188
ST6232B
ST6232B MICROCONTROLLER OPTION LIST
Customer
Address
Contact
Phone No
Reference
STMicroelectronics references
Device:
[ ] ST6232B
Package:
[ ] Dual in Line Plastic[ ] Plastic Quad Flat (Tape & Reel)
Temperature Range:
Special Marking:
[ ] 0°C to + 70°C[ ] - 40°C to + 85°C
[ ] No
[ ] Yes ”_ _ _ _ _ _ _ _ _ _ _ ”
Authorized characters are letters, digits, ’.’, ’-’, ’/’ and spaces only.
Maximum character count:SDIP42: 10
PQFP52: 10
Watchdog Selection:
[ ] Software Activation
[ ] Hardware Activation
Ports Pull-Up Selection: [ ] Yes [ ] No
NMI Pull-Up Selection: [ ] Yes [ ] No
Timer Pull-Up Selection: [ ] Yes [ ] No
External STOP Mode Control:[ ] Enabled
[ ] Disabled
OSG:
[ ] Enabled
[ ] Disabled
ROM Readout Protection:[ ] Standard (Fuse cannot be blown)
[ ] Enabled (Fuse can be blown by the customer)
Note: No part is delivered with protected ROM.
The fuse must be blown for protection to be effective.
Comments :
Supply Operating Range in the application:
Oscillator Fequency in the application:
Notes
. . . . . . . . . . . . . . . . . .
Signature
Date
85/86
189
ST6232B
1.3 ORDERING INFORMATION
The following section deals with the procedure for
transfer of customer codes to STMicroelectronics.
The STMicroelectronics Sales Organization will be
pleased to provide detailed information on con-
tractual points.
1.3.1 Transfer of Customer Code
Customer code is made up of the ROM contents
and the list of the selected mask options. The
ROM contents are to be sent on diskette, or by
electronic means, with the hexadecimal file gener-
ated by the development tool. All unused bytes
must be set to FFh.
Table 1. ROM Memory Map for ST6232B
ROM Page Device Address
Description
0000h-007Fh
Page 0
Reserved
User ROM
0080h-07FFh
The selected mask options are communicated to
STMicroelectronics using the correctly filled OP-
TION LIST appended.
0800h-0F9Fh
0FA0h-0FEFh
0FF0h-0FF7h
0FF8h-0FFBh
0FFCh-0FFDh
0FFEh-0FFFh
User ROM
Reserved
Interrupt Vectors
Reserved
NMI Vector
Reset Vector
Page 1
“STATIC”
1.3.2 Listing Generation and Verification
When STMicroelectronics receives the user’s
ROM contents, a computer listing is generated
from it. This listing refers exactly to the mask which
will be used to produce the specified MCU. The
listing is then returned to the customer who must
thoroughly check, complete, sign and return it to
STMicroelectronics. The signed listing forms a
part of the contractual agreement for the creation
of the specific customer mask.
0000h-000Fh
0010h-07FFh
Reserved
User ROM
Page 2
Page 3
0000h-000Fh
0010h-07FFh
Reserved
User ROM
Table 2. ROM version Ordering Information
Sales Type
ROM
I/O
Temperature Range
Package
ST6232BB1/XXX
ST6232BB6/XXX
ST6232BB3/XXX
0 to +70°C
-40 to 85°C
-40 to 125°C
SDIP42
7948
30
ST6232BQ1/XXX
ST6232BQ6/XXX
ST6232BQ3/XXX
0 to +70°C
-40 to 85°C
-40 to 125°C
PQFP52
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted
by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject
to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not
authorized for use as critical components in life support devices or systems without the express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics
1998 STMicroelectronics - All Rights Reserved.
Purchase of I2C Components by STMicroelectronics conveys a license under the Philips I2C Patent. Rights to use these components in an
I2C system is granted provided that the system conforms to the I2C Standard Specification as defined by Philips.
STMicroelectronics Group of Companies
Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands -
Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
http://www.st.com
86/86
190
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