SAA5542PS/NNNN_技术文档

INTEGRATED CIRCUITS

DATA SHEET

SAA55xx

TV microcontrollers with Closed

Captioning (CC) and On-Screen

Display (OSD)

Preliminary speciﬁcation

2000 Feb 23

Supersedes data of 1999 Aug 02

File under Integrated Circuits, IC02

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

CONTENTS

15.1

16

I²C-bus port selection

MEMORY INTERFACE

1

2

3

4

5

6

FEATURES

16.1

16.2

16.3

16.4

Memory structure

Memory mapping

Addressing memory

Page clearing

GENERAL DESCRIPTION

QUICK REFERENCE DATA

ORDERING INFORMATION

BLOCK DIAGRAM

17

DATA CAPTURE

Data Capture features

DISPLAY

17.1

18

PINNING INFORMATION

6.1

6.2

Pinning

Pin description

18.1

Display features

18.2

18.3

18.4

18.5

18.6

18.7

18.8

18.9

18.10

18.11

18.12

18.13

18.14

18.15

Display modes

7

MICROCONTROLLER

Microcontroller features

MEMORY ORGANIZATION

Display feature descriptions

Character and attribute coding

Screen and global controls

Text display controls

Display positioning

Character set

7.1

8

8.1

8.2

8.3

8.4

8.5

8.6

ROM bank switching

RAM organisation

Data memory

SFR memory

Character set feature bits

External (auxiliary) memory

ROM addressing

Redefinable characters

Display synchronization

Video/Data switch (Fast Blanking) polarity

Video/data switch adjustment

RGB brightness control

Contrast reduction

9

REDUCED POWER MODES

9.1

9.2

9.3

Idle mode

Power-down mode

Standby mode

19

20

21

22

23

24

MEMORY MAPPED REGISTERS (MMR)

LIMITING VALUES

10

I/O FACILITY

10.1

10.2

10.3

10.4

I/O ports

Port type

Port alternative functions

LED support

CHARACTERISTICS

QUALITY AND RELIABILITY

APPLICATION INFORMATION

11

INTERRUPT SYSTEM

ELECTROMAGNETIC COMPATIBILITY

(EMC) GUIDELINES

11.1

11.2

11.3

11.4

Interrupt enable structure

Interrupt enable priority

Interrupt vector address

Level/edge interrupt

25

PACKAGE OUTLINES

SOLDERING

26

26.1

Introduction to soldering through-hole mount

packages

Soldering by dipping or by solder wave

Manual soldering

Suitability of through-hole mount IC packages

for dipping and wave soldering methods

12

TIMER/COUNTER

13

WATCHDOG TIMER

26.2

26.3

26.4

13.1

14

Watchdog Timer operation

PULSE WIDTH MODULATORS

14.1

14.2

14.3

14.4

PWM control

Tuning Pulse Width Modulator (TPWM)

TPWM control

Software ADC (SAD)

I²C-BUS SERIAL I/O

27

28

29

DEFINITIONS

LIFE SUPPORT APPLICATIONS

PURCHASE OF PHILIPS I²C COMPONENTS

15

2000 Feb 23

2

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

1

FEATURES

• Single-chip microcontroller with integrated On-Screen

Display (OSD)

• One Time Programmable (OTP) memory for both

Program ROM and character sets

• Single power supply: 3.0 to 3.6 V

• 5 V tolerant digital inputs and I/O

2

GENERAL DESCRIPTION

• 29 I/O port via individual addressable controls

The SAA55xx OSD only family of devices are a derivative

of the Philips industry standard 80C51 microcontroller and

are intended for use as the central control mechanism in a

television receiver. They provide control functions for the

television system, On-Screen Display (OSD) and some

versions include an integrated data capture function.

• Programmable I/O for push-pull, open-drain and

quasi-bidirectional

• Two port lines with 8 mA sink (at <0.4 V) capability, for

direct drive of Light Emitting Diode (LED)

• Single crystal oscillator for microcontroller, OSD and

The main differences between the OSD only family and the

SAA55xx Text/CC family of baseline devices are:

data capture

• Power reduction modes: Standby, Idle and Power-down

• Byte level I²C-bus up to 200 kHz with dual port I/O

• Program ROM size: 16 to 64-kbyte

• Display RAM size: 1.25-kbyte (1 page Text OSD or

CC/OSD)

(Slave mode up to 400 kHz)

• 32 Dynamically Redefinable Characters for OSDs

• Auxiliary RAM size: 0.75-kbyte

• Special graphic characters allowing four colours per

• No teletext data capture (Closed Caption only)

• Additional power saving mode (Standby).

character

• Selectable character height 9, 10, 13 and 16 TV lines

• Pin compatibility throughout family

• Operating temperature: −20 to +70°C.

2000 Feb 23

3

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

3

QUICK REFERENCE DATA

SYMBOL

PARAMETER

MIN.

TYP.

MAX.

UNIT

Supply

V_DDX

I_DDP

any supply voltage (V_DDto V_SS

)

3.0

3.3

3.6

V

periphery supply current; note 1

core supply current

1

−

mA

µA

I_DDC

−

12

18

I_DDC(id)

I_DDC(pd)

I_DDC(stb)

I_DDA

Idle mode core supply current

Power-down mode core supply current

Standby mode core supply current

analog supply current

−

383

666

5.1

45

600

900

9

−

µA

−

mA

µA

−

48

I_DDA(id)

I_DDA(pd)

I_DDA(stb)

f_xtal

Idle mode analog supply current

Power-down mode analog supply current

Standby mode analog supply current

Fundamental mode nominal frequency

operating ambient temperature

storage temperature

−

444

433

809

12

700

950

−

µA

−

µA

−

MHz

°C

T_amb

−20

−55

−

+70

+125

T_stg

−

°C

Note

1. Peripheral supply current is dependent on external components and voltage levels on I/Os.

4

ORDERING INFORMATION

PACKAGE⁽²⁾

TYPE NUMBER⁽¹⁾

NAME

ROM

RAM

CC

DESCRIPTION

VERSION

SAA5540PS/nnnn SDIP52

SAA5541PS/nnnn

plastic shrink dual in-line package; SOT247-1 16-kbyte

256-byte

512-byte

750-byte

yes

52 leads (600 mil)

32-kbyte

SAA5542PS/nnnn

48-kbyte

64-kbyte

24-kbyte

SAA5543PS/nnnn

SAA5547PS/nnnn

Notes

1. ‘nnnn’ is a four digit number uniquely referencing the microcontroller program mask.

2. For details of the LQFP100 package, please contact your local regional sales office for availability.

2000 Feb 23

4

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

5

BLOCK DIAGRAM

handbook, full pagewidth

TV CONTROL

AND

2

I C-bus, general I/O

INTERFACE

ROM

(16 TO 64-KBYTE)

MICROPROCESSOR

(80C51)

SRAM

(256-BYTE)

DRAM

MEMORY

(UP TO 2-KBYTE)

INTERFACE

R

G

DATA

CAPTURE

DISPLAY

CVBS

B

VDS

DATA

CAPTURE

TIMING

VSYNC

HSYNC

DISPLAY

TIMING

GSA005

Fig.1 Block diagram (top level architecture).

2000 Feb 23

5

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

6

PINNING INFORMATION

Pinning

6.1

handbook, halfpage

P2.0/TPWM

1

2

3

4

5

6

7

8

9

52 P1.5/SDA1

51 P1.4/SCL1

50 P1.7/SDA0

49 P1.6/SCL0

48 P1.3/T1

P2.1/PWM0

P2.2/PWM1

P2.3/PWM2

P2.4/PWM3

P2.5/PWM4

P2.6/PWM5

P2.7/PWM6

P3.0/ADC0

47 P1.2/INT0

46 P1.1/T0

45 P1.0/INT1

44

V

DDP

P3.1/ADC1 10

P3.2/ADC2 11

P3.3/ADC3 12

43 RESET

42 XTALOUT

41 XTALIN

40 OSCGND

V

13

SSC

SAA55xx

P0.0 14

P0.1 15

P0.2 16

P0.3 17

P0.4 18

P0.5 19

P0.6 20

P0.7 21

39

38

V

DDC

SSP

37 VSYNC

36 HSYNC

35 VDS

34

33

32

31

R

G

B

V

22

SSA

DDA

CVBS0 23

CVBS1 24

30 P3.4/PWM7

29 COR

SYNC_FILTER 25

IREF 26

28 VPE

27 FRAME

MBK951

Fig.2 SDIP52 pin configuration.

6

2000 Feb 23

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

handbook, full pagewidth

P2.7/PWM6

P3.0/ADC0

n.c.

1

2

3

4

5

6

7

8

9

V

75

DDP

74 n.c.

73 RESET

P3.1/ADC1

P3.2/ADC2

P3.3/ADC3

n.c.

72

71

XTALOUT

70 XTALIN

OSCGND

n.c.

69

68

67

n.c.

n.c. 10

66 n.c.

V

11

n.c.

V

65

64

63

SSC

V

12

SSP

P0.5 13

n.c. 14

n.c. 15

P0.0 16

P0.1 17

P0.2 18

n.c. 19

n.c. 20

n.c. 21

P0.3 22

n.c. 23

P0.4 24

P3.7 25

SAA55xx

DDC

62 VPE_2

n.c.

V

61

60

59

SSP

P3.6

58 n.c.

n.c.

57

56

55 VSYNC

54 P3.5

HSYNC

VDS

53

52

51 n.c.

GSA001

Fig.3 LQFP100 pin configuration.

7

2000 Feb 23

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

6.2

Pin description

Table 1 SDIP52 and LQFP100 packages

SYMBOL

TYPE

DESCRIPTION

SDIP52

LQFP100

P2.0/TPWM

P2.1/PWM0

P2.2/PWM1

P2.3/PWM2

P2.4/PWM3

P2.5/PWM4

P2.6/PWM5

P2.7/PWM6

P3.0/ADC0

P3.1/ADC1

P3.2/ADC2

P3.3/ADC3

P3.4/PWM7

P3.5

1

2

100

93

94

95

96

97

98

1

I/O

−

Port 2. 8-bit programmable bidirectional port with

alternative functions.

3

P2.0/TPWM is the output for the 14-bit high precision

PWM. P2.1/PWM0 to P2.7/PWM6 are the outputs for

the 6-bit PWMs 0 to 6.

4

5

6

7

8

9

2

Port 3. 8-bit programmable bidirectional port with

alternative functions.

10

11

12

30

−

4

5

P3.0/ADC0 to P3.3/ADC3 are the inputs for the

software ADC facility. P3.4/PWM7 is the output for the

6-bit PWM7. P3.5 to P3.7 have no alternative

functions and are only available with the LQFP100

package.

6

44

54

59

25

11

16

17

18

22

24

13

28

29

30

31

P3.6

−

P3.7

−

V_SSC

13

14

15

16

17

18

19

20

21

22

23

core ground

P0.0

I/O

−

Port 0. 8-bit programmable bidirectional port.

P0.1

P0.5 and P0.6 have 8 mA current sinking capability for

direct drive of LEDs.

P0.2

P0.3

P0.4

P0.5

P0.6

P0.7

V_SSA

analog ground

CVBS0

I

Composite Video Baseband Signal (CVBS) input. A

positive-going 1 V (peak-to-peak) input is required.

CVBS1

24

25

32

34

I

Connected via a 100 nF capacitor.

SYNC_FILTER

CVBS sync ﬁlter input. This pin should be connected

to V_SSAvia a 100 nF capacitor.

IREF

26

27

35

41

I

Reference current input for analog circuits, connected

to V_SSAvia a 24 KΩ resistor.

FRAME

O

De-interlace output synchronised with the VSYNC

pulse to produce a non-interlaced display by

adjustment of the vertical deﬂection circuits.

VPE

28

42

I

OTP programming voltage

2000 Feb 23

8

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

SYMBOL

COR

TYPE

DESCRIPTION

SDIP52

LQFP100

29

43

O

Open-drain, active LOW output which allows selective

contrast reduction of the TV picture to enhance a

mixed mode display.

V_DDA

B

31

32

33

34

35

45

46

47

48

52

−

+3.3 V analog power supply

O

Pixel rate output of the BLUE colour information.

Pixel rate output of the GREEN colour information.

Pixel rate output of the RED colour information.

G

R

VDS

Video/data switch push-pull output for dot rate fast

blanking.

HSYNC

VSYNC

36

37

53

55

I

Schmitt triggered input TTL version of the horizontal

sync pulse. The polarity of this pulse is programmable

by register bit TXT1.H POLARITY.

Schmitt triggered input for a TTL version of the vertical

sync pulse. The polarity of this pulse is programmable

by register bit TXT1.V POLARITY.

V_SSP

38

39

40

41

42

43

12, 60

63

−

I

periphery ground

V_DDC

+3.3 V core power supply

crystal oscillator ground

12 MHz crystal oscillator input

12 MHz crystal oscillator output

OSCGND

XTALIN

XTALOUT

RESET

69

70

71

O

I

73

If the reset input is HIGH for at least 2 machine cycles

(24 oscillator periods) while the oscillator is running,

the device is reset. This pin should be connected to

V_DDPvia a capacitor.

V_DDP

44

45

46

47

48

49

50

51

52

75

76

78

79

80

81

82

83

84

−

+3.3 V periphery power supply

P1.0/INT1

P1.1/T0

I/O

Port 1. 8-bit programmable bidirectional port with

alternative functions.

P1.2/INT0

P1.3/T1

P1.0/INT1 is external interrupt 1 which can be

triggered on the rising and falling edge of the pulse.

P1.1/T0 is the Counter/Timer 0. P1.2/INT0 is external

interrupt 0. P1.3/T1 is the Counter/Timer 1.

P1.6/SCL0 is the serial clock input for the I²C-bus and

P1.7/SDA0 is the serial data port for the I²C-bus.

P1.4/SCL1 is the serial clock input for the I²C-bus and

P1.5/SDA1 is the serial data port for the I²C-bus.

P1.6/SCL0

P1.7/SDA0

P1.4/SCL1

P1.5/SDA1

VPE_2

n.c.

−

62

I

OTP programming voltage

not connected

3, 7 to 10, 14, 15,

19 to 21, 23, 26, 27, 33,

36 to 40, 49 to 51,

−

56 to 58, 61, 64 to 68,

72, 74, 77, 85 to 92, 99

2000 Feb 23

9

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

7

MICROCONTROLLER

8

MEMORY ORGANIZATION

The functionality of the microcontroller used on this device

is described here with reference to the industry standard

80C51 microcontroller. A full description of its functionality

can be found in the “Handbook IC20, 80C51-Based 8-bit

Microcontrollers”.

The device has the capability of a maximum of 64-kbyte

Program ROM and 2-kbyte Data RAM internally.

8.1

ROM bank switching

As the Program ROM does not exceed 64 kbytes in any of

the OSD only variants, ROM bank switching is not

required.

7.1

Microcontroller features

• 80C51 microcontroller core standard instruction set and

timing

The memory and security bits are structured as shown in

Fig.4.

• 1 µs machine cycle

The OSD only security bits are set as shown in Fig.5 for

production programmed devices.

• Maximum 64K × 8-bit program ROM

• 2 × 8-bit auxiliary RAM, maximum of 1.25 kbytes

required for display

The OSD only security bits are set as shown in Fig.6 for

production blank devices.

• Interrupt controller for individual enable/disable with two

level priority

8.2

RAM organisation

• Two 16-bit timer/counter registers

• Watchdog Timer

The Internal Data RAM is organized into two areas, Data

memory and Special Function Registers (SFRs).

• Auxiliary RAM page pointer

• 16-bit data pointer

8.3

Data memory

The Data memory is 256 × 8-bit, and occupies the address

range 00H to FFH when using indirect addressing and

00H to 7FH when using direct addressing. The SFRs

occupy the address range 80H to FFH and are accessible

using direct addressing only.

• Standby, Idle and Power-down modes

• 29 general I/O lines

• Eight 6-bit Pulse Width Modulator (PWM) outputs for

control of TV analog signals

• One 14-bit PWM for Voltage Synthesis Tuner (VST)

control

The lower 128 bytes of Data memory are mapped as

shown in Fig.8.

• 8-bit Analog-to-Digital Converter (ADC) with four

multiplexed inputs

The lowest 24 bytes are grouped into 4 banks of

8 registers, the next 16 bytes above the register banks

form a block of bit addressable memory space.

• 2 high current outputs for directly driving LEDs

• I²C-bus byte level bus interface with dual ports.

The upper 128 bytes are not allocated for any special area

or functions.

2000 Feb 23

10

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

handbook, full pagewidth

MEMORY

SECURITY BITS INTERACTION

PROGRAM ROM

USER ROM PROGRAMMING

(ENABLE/DISABLE)

VERIFY

(ENABLE/DISABLE)

USER ROM

(64K x 8-BIT)

CHARACTER ROM

USER ROM PROGRAMMING

(ENABLE/DISABLE)

VERIFY

(ENABLE/DISABLE)

USER ROM

(9K x 12-BIT)

GSA006

Fig.4 Memory and security bit structures.

_{handbook, full pagewidth}MEMORY

SECURITY BITS SET

USER ROM PROGRAMMING

(ENABLE/DISABLE)

VERIFY

(ENABLE/DISABLE)

PROGRAM ROM

DISABLED

ENABLED

CHARACTER ROM

GSA007

Fig.5 Security bits for production devices.

11

2000 Feb 23

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

_{handbook, full pagewidth}MEMORY

SECURITY BITS SET

USER ROM PROGRAMMING

(ENABLE/DISABLE)

VERIFY

(ENABLE/DISABLE)

PROGRAM ROM

ENABLED

CHARACTER ROM

ENABLED

GSA008

Fig.6 Security bits for production blank devices.

handbook, halfpage

SPECIAL

FUNCTION

REGISTERS

DATA

MEMORY

FFH

accessible

by indirect

addressing

only

accessible

by direct

addressing

only

upper 128 bytes

80H

7FH

accessible

by direct

and indirect

addressing

lower 128 bytes

00H

MBK956

Fig.7 Internal data memory.

12

2000 Feb 23

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

handbook, halfpage

7FH

30H

2FH

bit-addressable space

(bit addresses 00H to 7FH)

20H

1FH

R7

R0

R7

18H

17H

R0

R7

10H

0FH

4 banks of 8 registers

(R0 to R7)

R0

R7

08H

07H

R0

0

MGM677

Fig.8 Lower 128 bytes of internal RAM.

2000 Feb 23

13

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

Table 3 SFR bit description

BIT

FUNCTION

Accumulator (ACC)

ACC7 to ACC0

accumulator value

B Register (B)

B7 to B0

B register value

CC data byte 1 (CCDAT1)

CCD17 to CCD10

closed caption ﬁrst data byte

closed caption second data byte

closed caption slice line using 525-line number

CC data byte 2 (CCDAT2)

CCD26 to CCD20

CC line (CCLIN)

CS4 to CS0

Data Pointer High byte (DPH)

DPH7 to DPH0

data pointer high byte, used with DPL to address auxiliary memory

data pointer low byte, used with DPH to address auxiliary memory

Data pointer Low byte (DPL)

DPL7 to DPL0

Interrupt Enable Register (IE)

EA

disable all interrupts (logic 0), or use individual interrupt enable bits (logic 1)

enable BUSY interrupt

enable I²C-bus interrupt

EBUSY

ES2

ECC

ET1

enable closed caption interrupt

enable Timer 1 interrupt

EX1

ET0

enable external interrupt 1

enable Timer 0 interrupt

EX0

enable external interrupt 0

Interrupt Priority Register (IP)

PBUSY

PES2

PCC

PT1

priority EBUSY interrupt

priority ES2 Interrupt

priority ECC interrupt

priority Timer 1 interrupt

priority external interrupt 1

priority Timer 0 interrupt

priority external interrupt 0

PX1

PT0

PX0

Port 0 (P0)

P07 to P00

Port 0 I/O register connected to external pins

2000 Feb 23

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Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

BIT

FUNCTION

Port 1 (P1)

P17 to P10

Port 2 (P2)

P27 to P20

Port 3 (P3)

P37 to P30

Port 1 I/O register connected to external pins

Port 2 I/O register connected to external pins

Port 3 I/O register connected to external pins; P37 to P35 are only available with

the LQFP100 package

Port 0 Conﬁguration A (P0CFGA) and Port 0 Conﬁguration B (P0CFGB)

P0CFGA<7:0> and P0CFGB<7:0> These two registers are used to conﬁgure Port 0 pins. For example, the I/O

conﬁguration of Port 0 pin 3 is controlled using bit 3 in both P0CFGA and

P0CFGB. P0CFGB<x>/P0CFGA<x>:

00 = P0.x in open-drain configuration

01 = P0.x in quasi-bidirectional configuration

10 = P0.x in high-impedance configuration

11 = P0.x in push-pull configuration

Port 1 Conﬁguration A (P1CFGA) and Port 1 Conﬁguration B (P1CFGB)

P1CFGA<7:0> and P1CFGB<7:0> These two registers are used to conﬁgure Port 1 pins. For example, the I/O

conﬁguration of Port 1 pin 3 is controlled using bit 3 in both P1CFGA and

P1CFGB. P1CFGB<x>/P1CFGA<x>:

00 = P1.x in open-drain configuration

01 = P1.x in quasi-bidirectional configuration

10 = P1.x in high-impedance configuration

11 = P1.x in push-pull configuration

Port 2 Conﬁguration A (P2CFGA) and Port 2 Conﬁguration B (P2CFGB)

P2CFGA<7:0> and P2CFGB<7:0> These two registers are used to conﬁgure Port 2 pins. For example, the I/O

conﬁguration of Port 2 pin 3 is controlled by using bit 3 in both P2CFGA and

P2CFGB. P2CFGB<x>/P2CFGA<x>:

00 = P2.x in open-drain configuration

01 = P2.x in quasi-bidirectional configuration

10 = P2.x high-impedance configuration

11 = P2.x push-pull configuration

Port 3 Conﬁguration A (P3CFGA) and Port 3 Conﬁguration B (P3CFGB)

P3CFGA<7:0> and P3CFGB<7:0> These two registers are used to conﬁgure Port 3 pins. For example, the I/O

conﬁguration of Port 3 pin 3 is controlled using bit 3 in both P3CFGA and

P3CFGB. P3CFGB<x>/P3CFGA<x>:

00 = P3.x in open-drain configuration

01 = P3.x in quasi-bidirectional configuration

10 = P3.x in high-impedance configuration

11 = P3.x in push-pull configuration

2000 Feb 23

18

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

BIT

FUNCTION

Power Control Register (PCON)

ARD

RFI

auxiliary RAM disable, all MOVX instructions access the external data memory

disable ALE during internal access to reduce radio frequency interference

Watchdog Timer enable

WLE

GF1

GF0

PD

general purpose ﬂag

Power-down mode activation bit

IDL

Idle mode activation bit

Program Status Word (PSW)

C

carry bit

AC

auxiliary carry bit

F0

ﬂag 0, general purpose ﬂag

register bank selector bits; RS<1:0>:

00 = Bank 0 (00H to 07H)

01 = Bank 1 (08H to 0FH)

10 = Bank 2 (10H to 17H)

11 = Bank 3 (18H to 1FH)

overﬂow ﬂag

RS1 to RS0

OV

P

parity bit

Pulse Width Modulator 0 Control Register (PWM0)

PW0E

activate this PWM (logic 1)

pulse width modulator high time

PW0V5 to PW0V0

Pulse Width Modulator 1 Control Register (PWM1)

PW1E

activate this PWM (logic 1)

pulse width modulator high time

PW1V5 to PW1V0

Pulse Width Modulator 2 Control Register (PWM2)

PW2E

activate this PWM (logic 1)

pulse width modulator high time

PW2V5 to PW2V0

Pulse Width Modulator 3 Control Register (PWM3)

PW3E

activate this PWM (logic 1)

pulse width modulator high time

PW3V5 to PW3V0

Pulse Width Modulator 4 Control Register (PWM4)

PW4E

activate this PWM (logic 1)

pulse width modulator high time

PW4V5 to PW4V0

Pulse Width Modulator 5 Control Register (PWM5)

PW5E

activate this PWM (logic 1)

pulse width modulator high time

PW5V5 to PW5V0

2000 Feb 23

19

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

BIT

FUNCTION

Pulse Width Modulator 6 Control Register (PWM6)

PW6E

activate this PWM (logic 1)

pulse width modulator high time

PW6V5 to PW6V0

Pulse Width Modulator 7 Control Register (PWM7)

PW7E

activate this PWM (logic 1)

PW7V5 to PW7V0

pulse width modulator high time

Standby mode enabled (logic 1)

ROM Bank (ROMBK)

STBY

I²C-bus Slave Address Register (S1ADR)

ADR6 to ADR0

GC

I²C-bus slave address to which the device will respond

enable I²C-bus general call address (logic 1)

I²C-bus Control Register (S1CON)

CR2 to CR0

clock rate bits; CR<2:0>:

000 = 100 kHz bit rate

001 = 3.75 kHz bit rate

010 = 150 kHz bit rate

011 = 200 kHz bit rate

100 = 25 kHz bit rate

101 = 1.875 kHz bit rate

110 = 37.5 kHz bit rate

111 = 50 kHz bit rate

ENSI

STA

enable I²C-bus interface (logic 1)

START ﬂag. When this bit is set in slave mode, the hardware checks the I²C-bus

and generates a START condition if the bus is free or after the bus becomes free.

If the device operates in master mode it will generate a repeated START

condition.

STO

STOP ﬂag. If this bit is set in a master mode a STOP condition is generated.

A STOP condition detected on the I²C-bus clears this bit. This bit may also be set

in slave mode in order to recover from an error condition. In this case no STOP

condition is generated to the I²C-bus, but the hardware releases the SDA and

SCL lines and switches to the not selected receiver mode. The STOP ﬂag is

cleared by the hardware.

2000 Feb 23

20

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

BIT

FUNCTION

SI

Serial Interrupt ﬂag. This ﬂag is set and an interrupt request is generated, after

any of the following events occur:

• A START condition is generated in master mode

• The own slave address has been received during AA = 1

• The general call address has been received while S1ADR.GC and AA = 1

• A data byte has been received or transmitted in master mode (even if arbitration

is lost)

• A data byte has been received or transmitted as selected slave

• A STOP or START condition is received as selected slave receiver or

transmitter. While the SI ﬂag is set, SCL remains LOW and the serial transfer is

suspended. SI must be reset by software.

AA

Assert Acknowledge ﬂag. When this bit is set, an acknowledge is returned

after any one of the following conditions:

• Own slave address is received

• General call address is received (S1ADR.GC = 1)

• A data byte is received, while the device is programmed to be a master receiver

• A data byte is received, while the device is selected slave receiver.

When the bit is reset, no acknowledge is returned. Consequently, no interrupt is

requested when the own address or general call address is received.

I²C-bus Data Register (S1DAT)

DAT7 to DAT0

I²C-bus data

I²C-bus Status Register (S1STA)

STAT4 to STAT0

I²C-bus interface status

Software ADC Register (SAD)

VHI

analog input voltage greater than DAC voltage (logic 1)

CH1 to CH0

ADC input channel select; CH<1:0>:

00 = ADC3

01 = ADC0

10 = ADC1

11 = ADC2

ST⁽¹⁾

initiate voltage comparison between ADC input channel and SAD value

4 MSBs of DAC input word

SAD7 to SAD4

Software ADC Control Register (SADB)

DC_COMP

enable DC comparator mode (logic 1)

SAD3 to SAD0

4 LSBs of SAD value

stack pointer value

Stack Pointer (SP)

SP7 to SP0

2000 Feb 23

21

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

BIT

FUNCTION

Timer/Counter Control Register (TCON)

TF1

Timer 1 overﬂow ﬂag. Set by hardware on timer/counter overﬂow. Cleared by

hardware when processor vectors to interrupt routine.

TR1

TF0

Timer 1 run control bit. Set/cleared by software to turn timer/counter on/off.

Timer 0 overﬂow ﬂag. Set by hardware on timer/counter overﬂow. Cleared by

hardware when processor vectors to interrupt routine.

TR0

IE1

Timer 0 run control bit. Set/cleared by software to turn timer/counter on/off.

Interrupt 1 edge ﬂag (both edges generate ﬂag). Set by hardware when

external interrupt edge detected. Cleared by hardware when interrupt processed.

IT1

IE0

IT0

Interrupt 1 type control bit. Set/cleared by software to specify edge/LOW level

triggered external interrupts.

Interrupt 0 edge l ﬂag. Set by hardware when external interrupt edge detected.

Cleared by hardware when interrupt processed.

Interrupt 0 type ﬂag. Set/cleared by software to specify falling edge/LOW level

triggered external interrupts.

14-bit PWM MSB Register (TDACH)

TPWE

activate this 14-bit PWM (logic 1)

TD13 to TD8

6 MSBs of 14-bit number to be output by the 14-bit PWM

14-bit PWM LSB Register (TDACL)

TD7 to TD0

8 LSBs of 14-bit number to be output by the 14-bit PWM

Timer 0 high byte

Timer 0 High byte (TH0)

TH07 to TH00

Timer 1 High byte (TH1)

TH17 to TH10

Timer 1 high byte

Timer 0 Low byte (TL0)

TL07 to TL00

Timer 0 low byte

Timer 1 Low byte (TL1)

TL17 to TL10

Timer 1 low byte

Timer/Counter Mode Control (TMOD)

GATE

C/T

gating control Timer/Counter 1

Counter/Timer 1 selector

M1 to M0

mode control bits timer/counter 1; M<1:0>:

00 = 8-bit timer or 8-bit counter with divide-by-32 prescaler

01 = 16-bit time interval or event counter

10 = 8-bit time interval or event counter with automatic reload upon overflow;

reload value stored in TH1

11 = stopped

GATE

C/T

gating control Timer/Counter 0

Counter/Timer 0 selector

2000 Feb 23

22

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

BIT

FUNCTION

mode control bits timer/counter 0; M<1:0>:

M1 to M0

00 = 8-bit timer or 8-bit counter with divide-by-32 prescaler

01 = 16-bit time interval or event counter

10 = 8-bit time interval or event counter with automatic reload upon overflow;

reload value stored in TH0

11 = one 8-bit time interval or event counter and one 8-bit time interval counter

Text Register 0 (TXT0)

AUTO FRAME

frame output is switched off automatically if any video displayed (logic 1)

force frame output to be LOW (logic 1)

DISABLE FRAME

Text Register 1 (TXT1)

FIELD POLARITY

H POLARITY

VSYNC pulse in second half of line during even ﬁeld (logic 1)

HSYNC reference edge is negative going (logic 1)

VSYNC reference edge is negative going (logic 1)

V POLARITY

Text Register 4 (TXT4)

OSD BANK ENABLE

alternate OSD location available via graphic attribute, additional 32 location

(logic 1)

QUAD WIDTH ENABLE

EAST/WEST

enable display of quadruple width characters (logic 1)

eastern character selection of character codes A0H to FFH (logic 1)

disable normal decoding of double height characters (logic 1)

enable meshing of black background (logic 1)

DISABLE DOUBLE HEIGHT

B MESH ENABLE

C MESH ENABLE

TRANS ENABLE

enable meshing of coloured background (logic 1)

display black background as video (logic 1)

SHADOW ENABLE

display shadow/fringe (default SE black) (logic 1)

Text Register 5 (TXT5)

BKGND OUT

BKGND IN

background colour displayed outside teletext boxes (logic 1)

background colour displayed inside teletext boxes (logic 1)

COR active outside teletext and OSD boxes (logic 1)

COR active inside teletext and OSD boxes (logic 1)

text displayed outside teletext boxes (logic 1)

COR OUT

COR IN

TEXT OUT

TEXT IN

text displayed inside teletext boxes (logic 1)

PICTURE ON OUT

PICTURE ON IN

video displayed outside teletext boxes (logic 1)

video displayed inside teletext boxes (logic 1)

Text Register 6 (TXT6)

BKGND OUT

BKGND IN

COR OUT

background colour displayed outside teletext boxes (logic 1)

background colour displayed inside teletext boxes (logic 1)

COR active outside teletext and OSD boxes (logic 1)

COR active inside teletext and OSD boxes (logic 1)

text displayed outside teletext boxes (logic 1)

COR IN

TEXT OUT

TEXT IN

text displayed inside teletext boxes (logic 1)

PICTURE ON OUT

video displayed outside teletext boxes (logic 1)

2000 Feb 23

23

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

BIT

PICTURE ON IN

FUNCTION

video displayed inside teletext boxes (logic 1)

Text Register 7 (TXT7)

CURSOR ON

DOUBLE HEIGHT

BOX ON 24

display cursor at position given by TXT9 and TXT10 (logic 1)

display each character as twice normal height (logic 1)

enable display of teletext boxes in memory row 24 (logic 1)

enable display of teletext boxes in memory row 1 to 23 (logic 1)

enable display of teletext boxes in memory row 0 (logic 1)

BOX ON 1 − 23

BOX ON 0

Text Register 8 (TXT8)

FLICKER STOP ON

DISABLE SPANISH

PKT 26 RECEIVED⁽²⁾

WSS RECEIVED⁽²⁾

WSS ON

disable ‘Flicker Stopper’ circuitry (logic 1)

disable special treatment of Spanish packet 26 characters (logic 1)

packet 26 data has been processed (logic 1)

wide screen signalling data has been processed (logic 1)

enable acquisition of WSS data (logic 1)

CVBS1/CVBS0

select CVBS1 as source for device (logic 1)

Text Register 9 (TXT9)

CURSOR FREEZE

CLEAR MEMORY⁽¹⁾

R4 to R0⁽²⁾

lock cursor at current position (logic 1)

clear memory block pointed to by TXT15

current memory row value

Text Register 10 (TXT10)

C5 to C0⁽³⁾

current memory column value

Text Register 11 (TXT11)

D7 to D0

data value written or read from memory location deﬁned by TXT9, TXT10 and

TXT15

Text Register 12 (TXT12)

525/625 SYNC⁽⁴⁾

525-line CVBS signal is being received (logic 1)

mask programmable identiﬁcation for character set

acquisition can be synchronised to CVBS (logic 1)

ROM VER4 to ROM VER0

VIDEO SIGNAL QUALITY

Text Register 13 (TXT13)

PAGE CLEARING

525 DISPLAY

software or power-on page clear in progress (logic 1)

525-line synchronisation for display (logic 1)

Text Register 17 (TXT17)

FORCE ACQ1 to FORCE ACQ0

FORCE ACQ<1:0>:

00 = automatic selection

01 = force 525 timing, force 525 teletext standard

10 = force 625 timing, force 625 teletext standard

11 = force 625 timing, force 525 teletext standard

2000 Feb 23

24

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

BIT

FUNCTION

FORCE DISP1 to FORCE DISP0

FORCE DISP<1:0>:

00 = automatic selection

01 = force display to 525 mode (9 lines per row)

10 = force display to 625 mode (10 lines per row)

11 = not valid (default to 625 mode)

SCREEN COL2 to SCREEN COL0 Deﬁnes colour to be displayed instead of TV picture and black background; these

bits are equivalent to the RGB components. SCREEN COL<2:0>:

000 = transparent

001 = CLUT entry 9

010 = CLUT entry 10

011 = CLUT entry 11

100 = CLUT entry 12

101 = CLUT entry 13

110 = CLUT entry 14

111 = CLUT entry 15

Text Register 18 (TXT18)

NOT3 to NOT0

BS1 to BS0

national option table selection, maximum of 31 when used with EAST/WEST bit

basic character set selection

Text Register 19 (TXT19)

TEN

enable twist character set (logic 1)

TC2 to TC0

TS1 to TS0

language control bits (C12, C13 and C14) that has twisted character set

twist character set selection

Text Register 20 (TXT20)

DRCS ENABLE

OSD PLANES

re-map column 9 to DRCS in TXT mode (logic 1)

character code columns 8 and 9 deﬁned as double plane characters (logic 1)

OSD LANG ENABLE

enable use of OSD LAN<2:0> to deﬁne language option for display, instead of

C12, C13 and C14

OSD LAN2 to OSD LAN0

Text Register 21 (TXT21)

DISP LINES1 to DISP LINES0

alternative C12, C13 and C14 bits for use with OSD menus

the number of display lines per character row; DISP LINES<1:0>:

00 = 10 lines per character (defaults to 9 lines in 525 mode)

01 = 13 lines per character

10 = 16 lines per character

11 = reserved (logic 1)

CHAR SIZE1 to CHAR SIZE0

character matrix size; CHAR SIZE<1:0>:

00 = 10 lines per character (matrix 12 × 10)

01 = 13 lines per character (matrix 12 × 13)

10 = 16 lines per character (matrix 12 × 16)

11 = reserved

I²C PORT 1

2000 Feb 23

enable I²C-bus Port 1 selection (P1.5/SDA1 and P1.4/SCL1) (logic 1)

25

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

BIT

FUNCTION

closed caption acquisition on (logic 1)

CC ON

I²C PORT 0

enable I²C-bus Port 0 selection (P1.7/SDA0 and P1.6/SCL0) (logic 1)

CC/TXT

display conﬁgured for CC mode (logic 1)

Text Register 22 (TXT22)

GPF7 to GPF5

GPF4

general purpose register, bits deﬁned by mask programmable bits

reserved

GPF3

PWM0, PWM1, PWM2 and PWM3 output on Port 2.1 to Port 2.4 respectively

(logic 1)

GPF2

enable closed caption acquisition (logic 1)

reserved

GPF1 and GPF0

Watchdog Timer (WDT)

WDV7 to WDV0

Watchdog Timer period

Watchdog Timer Key (WDTKEY)

WKEY7 to WKEY0⁽⁵⁾

XRAMP

Watchdog Timer Key value

XRAMP7 to XRAMP0

internal RAM access upper byte address

Notes

1. This flag is set by software and reset by hardware.

2. Valid range TXT mode 0 to 24.

3. Valid range TXT mode 0 to 39.

4. Only valid when VIDEO SIGNAL QUALITY is set.

5. Must be set to 55H to disable Watchdog Timer when active.

2000 Feb 23

26

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

8.5

Character set feature bits

Features available on the OSD only devices are reflected in a specific area of the Character ROM. These sections of the

Character ROM are mapped to two Special Function Registers: TXT22 and TXT12. Character ROM address 09FEH is

mapped to SFR TXT22 as shown in Table 4. Character ROM address 09FFH is mapped to SFR TXT12 as shown in

Table 6.

Table 4 Character ROM - TXT22 mapping

U = used; X = reserved

MAPPED ITEMS

11

10

9

8

7

6

5

4

3

2

1

0

Character ROM

address 09FEH

X

U

X

Mapped to TXT22

−

7

6

5

4

3

2

1

0

Table 5 Description of Character ROM address 09FEH bits

BIT

DESCRIPTION

0 to 1

2

reserved; normally all set to logic 1

1 = enable CC acquisition

0 = disable CC acquisition

3

1 = PWM0, PWM1, PWM2 and PWM3 output routed to Port 2.1 to Port 2.4 respectively

0 = PWM0, PWM1, PWM2 and PWM3 output routed to Port 3.0 to Port 3.3 respectively

4 to 11

reserved; normally all set to logic 1

Table 6 Character ROM - TXT12 mapping

U = used; X = reserved

MAPPED ITEMS

11

10

9

8

7

6

5

4

3

2

1

0

Character ROM

address 09FFH

X

Mapped to TXT12

−

6

5

4

3

2

Table 7 Description of Character ROM address 09FFH bits

BIT

DESCRIPTION

0 to 11

reserved; normally all set to logic 1

2000 Feb 23

27

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

8.6

External (auxiliary) memory

8.6.1

AUXILIARY RAM PAGE SELECTION

The normal 80C51 external memory area has been

mapped internally to the device, this means that the MOVX

instruction accesses memory internal to the device.

The Auxiliary RAM page pointer is used to select one of

the 256 pages within the Auxiliary RAM, not all pages are

allocated; refer to Fig.9 for further detail. A page consists

of 256 consecutive bytes.

handbook, halfpage

7FFFH

FFFFH

8C00H

8BFFH

DYNAMICALLY

REDEFINABLE

CHARACTERS

8800H

87FFH

DISPLAY REGISTERS

87F0H

871FH

CLUT

8700H

2400H

23FFH

DISPLAY RAM

FOR

TEXT OSD

84FFH

ADDITIONAL

DATA RAM

(1)

8460H

2000H

845FH

DISPLAY RAM

FOR

CLOSED CAPTION

02FFH

DATA RAM

0000H

(1)

8000H

GSA009

lower 32 kbytes

upper 32 kbytes

(1) Display RAM for Closed Caption and Text is shared.

Fig.9 Auxiliary RAM allocation.

2000 Feb 23

28

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

handbook, full pagewidth

FFFFH

FFH

SFR XRAMP = FFH

SFR XRAMP = FEH

00H

FFH

FF00H

FEFFH

00H

FE00H

MOVX @ Ri,A

MOVX A, @ Ri

MOVX @ DPTR,A

MOVX A, @ DPTR

01FFH

FFH

SFR XRAMP = 01H

SFR XRAMP = 00H

00H

FFH

0100H

00FFH

00H

0000H

MBK958

Fig.10 Indirect addressing of Auxiliary RAM.

2000 Feb 23

29

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

9

REDUCED POWER MODES

• The third method of terminating Idle mode is with an

external hardware reset. Since the oscillator is running,

the hardware reset need only be active for two machine

cycles (24 clocks at 12 MHz) to complete the reset

operation. Reset defines all SFRs and Display memory

to an initialized state, but maintains all other RAM

values. Code execution commences with the Program

Counter set to ‘0000’.

There are three power saving modes: Standby, Idle and

Power-down, incorporated into the OSD only device.

When utilizing any of these modes, power to the device

(V_DDP, V_DDCand V_DDA) should be maintained, since power

saving is achieved by clock gating on a section by section

basis.

9.1

Idle mode

9.2

Power-down mode

During Idle mode, Acquisition, Display and the Central

Processing Unit (CPU) sections of the device are disabled.

The following functions remain active:

In Power-down mode the crystal oscillator is stopped.

The contents of all SFRs and Data memory are

maintained, However, the contents of the Auxiliary/Display

memory are lost. The port pins maintain the values defined

by their associated SFRs. Since the output values on RGB

and VDS are maintained the display output must be made

inactive before entering Power-down mode.

• Memory interface

• I²C-bus interface

• Timer/Counters

• Watchdog Timer

• Pulse Width Modulators.

The Power-down mode is activated by setting the PD bit in

the PCON register. It is advised to disable the Watchdog

Timer prior to entering Power-down.

To enter Idle mode the IDL bit in the PCON register must

be set. The Watchdog Timer must be disabled prior to

entering the Idle mode to prevent the device being reset.

Once in Idle mode, the crystal oscillator continues to run,

but the internal clock to the CPU, Acquisition and Display

are gated out. However, the clocks to the Memory

interface, I²C-bus interface, timer/counters, Watchdog

Timer and Pulse Width Modulators are maintained.

The CPU state is frozen along with the status of all SFRs,

internal RAM contents are maintained, as are the device

output pin values.

There are three methods of exiting Power-down mode:

• An external interrupt provides the first mechanism for

waking from Power-down. Since the clock is stopped,

external interrupts need to be set level sensitive prior to

entering Power-down. The interrupt is serviced, and

following the instruction RETI, the next instruction to be

executed will be the one after the instruction that put the

device into Power-down mode.

• A second method of exiting power-down is via an

interrupt generated by the SAD DC Compare circuit.

When the device is configured in this mode, detection of

a certain analog threshold at the input to the SAD may

be used to trigger wake-up of the device i.e. TV Front

Panel Key-press. As above, the interrupt is serviced,

and following the instruction RETI, the next instruction to

be executed will be the one following the instruction that

put the device into the Power-down.

Since the output values on Red Green Blue (RGB) and the

Video Data Switch (VDS) are maintained the display

output must be disabled before entering this mode.

There are three methods to recover from Idle mode:

• Assertion of an enabled interrupt will cause the IDL bit to

be cleared by hardware, thus terminating Idle mode.

The interrupt is serviced, and following the instruction

RETI, the next instruction to be executed will be the one

after the instruction that put the device into Idle mode.

• The third method of terminating the Power-down mode

is with an external hardware reset. Reset defines all

SFRs and Display memory, but maintains all other RAM

values. Code execution commences with the Program

Counter set to ‘0000’.

• A second method of exiting the Idle mode is via an

interrupt generated by the Software Analog-to-Digital

(SAD) DC Compare circuit. When the device is

configured in this mode, detection of an analog

threshold at the input to the SAD may be used to trigger

wake-up of the device i.e. TV Front Panel Key-press.

As above, the interrupt is serviced, and following the

instruction RETI, the next instruction to be executed will

be the one following the instruction that put the device

into Idle mode.

2000 Feb 23

30

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

9.3

Standby mode

10.2.1 OPEN-DRAIN

When Standby mode is entered both Acquisition and

Display sections are disabled. The following functions

remain active:

The open-drain configuration can be used for bidirectional

operation of a port. It requires an external pull-up resistor,

the pull-up voltage has a maximum value of 5.5 V, to allow

connection of the device into a 5 V environment.

• 80C51 core

Note that the I²C-bus ports (P1.4, P1.5, P1.6 and P1.7)

can only be configured as open-drain.

• Memory interface

• I²C-bus interface

• Timer/Counters

• Watchdog Timer

• Software ADC

10.2.2 QUASI-BIDIRECTIONAL

The quasi-bidirectional configuration is a combination of

open-drain and push-pull. It requires an external pull-up

resistor to V_DDP(nominally 3.3 V). When a signal transition

from LOW-to-HIGH is output from the device, the pad is

put into push-pull configuration for one clock cycle

(166 ns) after which the pad goes into open-drain

configuration. This configuration is used to speed up the

edges of signal transitions. This is the default state of

operation of the pads after reset.

• Pulse Width Modulators

To enter Standby mode, the STANDBY control bit in the

ROMBK SFR (bit 7) must be set. It can be used in

conjunction with either Idle or Power-down modes to

switch between power saving modes. This mode enables

the 80C51 core to decode either IR remote commands or

receive I²C-bus commands without the device being fully

powered.

10.2.3 HIGH-IMPEDANCE

The Standby state is maintained upon exit from either the

Idle mode or Power-down mode. No wake-up from

Standby is necessary as the 80C51 core remains

operational.

The high-impedance configuration can be used for input

only operation of the port. When using this configuration

the two output transistors are turned off.

10.2.4 PUSH-PULL

Since the output values on RGB and VDS are maintained

the display output must be disabled before entering this

mode.

The push-pull configuration can be used for output only.

In this configuration the signal is driven to either 0 V or

V_DDP, which is nominally 3.3 V.

10 I/O FACILITY

10.1 I/O ports

10.3 Port alternative functions

Ports 1, 2 and 3 are shared with alternative functions to

enable control of external devices and circuitry.

The alternative functions are enabled by setting the

appropriate SFR and also writing a logic 1 to the port bit

that the function occupies.

The SAA55xx devices have 29 I/O lines, each is

individually addressable, or form 3 parallel 8-bit

addressable ports which are Port 0, Port 1 and Port 2.

Port 3 has 5-bit parallel I/Os only.

10.2 Port type

10.4 LED support

All individual ports can be programmed to function in one

of four I/O configurations: open-drain, quasi-bidirectional,

high-impedance and push-pull. The I/O configuration is

selected using two associated Port Configuration

Registers: PnCFGA and PnCFGB (where n = port number

0, 1, 2 or 3); see Table 3.

Port pins P0.5 and P0.6 have a 8 mA current sinking

capability to enable LEDs in series with current limiting

resistors to be driven directly, without the need for

additional buffering circuitry.

2000 Feb 23

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Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

11 INTERRUPT SYSTEM

If requests of the same priority level are received

simultaneously, an internal polling sequence determines

which request is serviced. Thus, within each priority level

there is a second priority structure determined by the

polling sequence as defined in Table 8.

The device has six interrupt sources, each of which can be

enabled or disabled. When enabled each interrupt can be

assigned one of two priority levels. There are four

interrupts that are common to the 80C51, two of these are

external interrupts (EX0 and EX1) and the other two are

timer interrupts (ET0 and ET1). In addition to the

conventional 80C51, one application specific interrupt is

incorporated internal to the device which has following

functionality:

Table 8 Interrupt priority (within same level)

PRIORITY WITHIN

LEVEL

INTERRUPT

VECTOR

SOURCE

EX0

ET0

highest

0003H

000BH

0013H

001BH

002BH

0033H

• Display Busy interrupt (EBUSY). An interrupt is

generated when the display enters either a Horizontal or

Vertical Blanking Period. i.e. indicates when the

microcontroller can update the display RAM without

causing undesired effects on the screen. This interrupt

can be configured in one of two modes using the MMR

Configuration (address 87FFH, bit TXT/V):

−

EX1

−

ET1

−

ES2

EBUSY

lowest

– Text Display Busy. An interrupt is generated on each

active horizontal display line when the Horizontal

Blanking Period is entered

11.3 Interrupt vector address

The processor acknowledges an interrupt request by

executing a hardware generated LCALL to the appropriate

servicing routine. The interrupt vector addresses for each

source are shown in Table 8.

– Vertical Display Busy. An interrupt is generated on

each vertical display field when the Vertical Blanking

period is entered.

11.4 Level/edge interrupt

11.1 Interrupt enable structure

The external interrupt can be programmed to be either

level-activated or transition-activated by setting or clearing

the IT0/IT1 bits in the Timer Control SFR (TCON).

Each of the individual interrupts can be enabled or

disabled by setting or clearing the relevant bit in the

Interrupt Enable Register (IE). All interrupt sources can

also be globally disabled by clearing the EA bit (IE.7).

Table 9 External interrupt activation

11.2 Interrupt enable priority

ITx

0

LEVEL

active LOW

−

EDGE

−

Each interrupt source can be assigned one of two priority

levels. The interrupt priorities are defined by the Interrupt

Priority Register (IP). A low priority interrupt can be

interrupted by a high priority interrupt, but not by another

low priority interrupt. A high priority interrupt can not be

interrupted by any other interrupt source. If two requests of

different priority level are received simultaneously, the

request with the highest priority level is serviced.

1

INT0 = negative edge

INT1 = positive and negative edge

The external interrupt INT1 differs from the standard

80C51 interrupt in that it is activated on both edges when

in edge sensitive mode. This is to allow software pulse

width measurement for handling remote control inputs.

2000 Feb 23

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Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

handbook, full pagewidth

H1

L1

highest priority level 1

EX0

highest priority level 0

H2

L2

ET0

EX1

H3

L3

H4

L4

ET1

H5

L5

ES2

lowest priority level 1

lowest priority level 0

H6

L6

EBUSY

GSA033

interrupt

source

enable

global

enable

priority

control

<

>

<

>

SFR IE 0:6

SFR IE.7

SFR IP 0:6

Fig.11 Interrupt structure.

2000 Feb 23

33

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

12 TIMER/COUNTER

The 8-bit timer is incremented every ‘t’ seconds where:

Two 16-bit timers/counters are incorporated Timer 0 and

Timer 1. Both can be configured to operate as either timers

or event counters.

1

t = 12 × 2048 ×

= 12 × 2048 ×

= 2.048 ms

--------

f_osc

---------------------

12 × 10⁶

In Timer mode, the register is incremented on every

machine cycle. It is therefore counting machine cycles.

Since the machine cycle consists of twelve oscillator

periods, the count rate is ¹⁄₁₂f_osc= 1 MHz.

13.1 Watchdog Timer operation

The Watchdog operation is activated when the WLE bit in

the Power Control SFR (PCON) is set. The Watchdog can

be disabled by software by loading the value 55H into the

Watchdog Timer Key SFR (WDTKEY). This must be

performed before entering the Idle or Power-down mode to

prevent exiting the mode prematurely.

In Counter mode, the register is incremented in response

to a negative transition at its corresponding external pin T0

or T1. Since the pins T0 and T1 are sampled once per

machine cycle, it takes two machine cycles to recognise a

transition, this gives a maximum count rate of

¹⁄₂₄f_osc= 0.5 MHz.

Once activated the Watchdog Timer SFR (WDT) must be

reloaded before the timer overflows. The WLE bit must be

set to enable loading of the WDT SFR, once loaded the

WLE bit is reset by hardware, this is to prevent erroneous

software from loading the WDT SFR.

There are six Special Function Registers used to control

the timers/counters. These are: TCON, TMOD, TL0, TH0,

TL1 and TH1.

The value loaded into the WDT defines the Watchdog

Interval (WI).

The timer/counter function is selected by control bits C/T in

the Timer Mode SFR (TMOD). These two Timer/Counters

have four operating modes, which are selected by bit-pairs

(M1 and M0) in TMOD. Detail of the modes of operation is

given in “Handbook IC20, 80C51-Based 8-bit

Microcontrollers”.

WI = (256 – WDT) × t = (256 – WDT) × 2.048 ms

The range of intervals is from WDT = 00H which gives

524 ms to WDT = FFH which gives 2.048 ms.

TL0 and TH0 are the actual Timer/Counter registers for

Timer 0. TL0 is the low byte and TH0 is the high byte.

TL1 and TH1 are the actual Timer/Counter registers for

Timer 1. TL1 is the low byte and TH1 is the high byte.

14 PULSE WIDTH MODULATORS

The device has eight 6-bit Pulse Width Modulated (PWM)

outputs for analog control of e.g. volume, balance, bass,

treble, brightness, contrast, hue and saturation. The PWM

outputs generate pulse patterns with a repetition rate of

21.33 µs, with the high time equal to the PWM SFR value

multiplied by 0.33 µs. The analog value is determined by

the ratio of the high time to the repetition time, a D.C.

voltage proportional to the PWM setting is obtained by

means of an external integration network (low-pass filter).

13 WATCHDOG TIMER

The Watchdog Timer is a counter that once in an overflow

state forces the microcontroller into a reset condition.

The purpose of the Watchdog Timer is to reset the

microcontroller if it enters an erroneous processor state

(possibly caused by electrical noise or RFI) within a

reasonable period of time. When enabled, the Watchdog

circuitry will generate a system reset if the user program

fails to reload the Watchdog Timer within a specified length

of time known as the Watchdog Interval (WI).

14.1 PWM control

The relevant PWM is enabled by setting the PWM enable

bit PWxE in the PWMx Control Register (where x = 0 to 7).

The high time is defined by the value PWxV<5:0>.

The Watchdog Timer consists of an 8-bit counter with an

11-bit prescaler. The prescaler is fed with a signal whose

frequency is ¹⁄₁₂f_osc(1 MHz for 12 MHz oscillator).

2000 Feb 23

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Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

14.2 Tuning Pulse Width Modulator (TPWM)

The resolution of the DAC voltage with a nominal value is

3.3

⁄₂₅₆≈ 13 mV. The external analog voltage has a lower

The device has a single 14-bit PWM that can be used for

Voltage Synthesis Tuning. The method of operation is

similar to the normal PWM except that the repetition period

is 42.66 µs.

value equivalent to V_SSAand an upper value equivalent to

_DDP− V_tn, where V_tnis the threshold voltage for an N type

V

Metal Oxide Semiconductor transistor. The reason for this

is that the input pins for the analog signals (P3.0 to P3.3)

are 5 V tolerant for normal port operations, i.e. when not

used as analog input. To protect the analog multiplexer

and comparator circuitry from the 5 V, a series transistor is

used to limit the voltage. This limiting introduces a voltage

drop equivalent to V_tn(≈0.6 V) on the input voltage. The

maximum value of V_tnis 0.75 V, therefore for worst case

calculations, the maximum input to the SAD should be

calculated as V_DD(min)− 0.75 V. Therefore, for an input

voltage in the range V_DDPto V_DDP− V_tnthe SAD returns

the same comparison value.

14.3 TPWM control

Two SFRs are used to control the TPWM, they are TDACL

and TDACH. The TPWM is enabled by setting the

TPWE bit in the TDACH SFR. The most significant bits

TD<13:7> alter the high period between 0 and 42.33 µs.

The seven least significant bits TD<6:0> extend certain

pulses by a further 0.33 µs, e.g. if TD<6:0> = 01H then

1 in 128 periods will be extended by 0.33 µs, if

TD<6:0> = 02H then 2 in 128 periods will be extended.

The TPWM will not start to output a new value until TDACH

has been written to. Therefore, if the value is to be

changed, TDACL should be written before TDACH.

14.4.3 SAD DC COMPARATOR MODE

The SAD module incorporates a DC Comparator mode

which is selected using the DC_COMP control bit in the

SADB SFR. This mode enables the microcontroller to

detect a threshold crossing at the input to the selected

analog input pin (P3.0/ADC0, P3.1/ADC1, P3.2/ADC2 or

P3.3/ADC3) of the software ADC. A level sensitive

interrupt is generated when the analog input voltage level

at the pin falls below the analog output level of the SAD

DAC.

14.4 Software ADC (SAD)

Four successive approximation Analog-to-Digital

Converters can be implemented in software by making use

of the on-board 8-bit Digital-to-Analog Converter and

Analog Comparator.

14.4.1 SAD CONTROL

This mode is intended to provide the device with a

wake-up mechanism from Power-down or Idle mode when

a key-press on the front panel of the TV is detected.

The control of the required analog input is done using the

channel select bits CH<1:0> in the SAD SFR, this selects

the required analog input to be passed to one of the inputs

of the comparator. The second comparator input is

generated by the DAC whose value is set by the bits

SAD<7:0> in the SAD and SADB SFRs. A comparison

between the two inputs is made when the start compare bit

ST in the SAD SFR is set, this must be at least one

instruction cycle after the SAD<7:0> value has been set.

The result of the comparison is given on VHI one

instruction cycle after the setting of ST.

The following software sequence should be used when

utilizing this mode for Power-down or Idle:

1. Disable INT1 using the IE SFR.

2. Set INT1 to level sensitive using the TCON SFR.

3. Set the DAC digital input level to the desired threshold

level using SAD/SADB SFRs and select the required

input pin (P3.0/ADC0, P3.1/ADC1, P3.2/ADC2 or

P3.3/ADC3) using CH<1:0> in the SAD SFR.

14.4.2 SAD INPUT VOLTAGE

4. Enter DC Compare mode by setting the DC_COMP

enable bit in the SADB SFR.

The external analog voltage that is used for comparison

with the internally generated DAC voltage does not have

the same voltage range. The DAC has a lower reference

5. Enable INT1 using the IE SFR.

6. Enter Power-down/Idle mode. Upon wake-up the SAD

should be restored to its conventional operating mode

by disabling the DC_COMP control bit.

level of V_SSAand an upper reference level of V_DDP

.

2000 Feb 23

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Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

V

handbook, halfpage

DDP

ADC0

ADC1

ADC2

ADC3

MUX

4 : 1

<

>

CH 1:0

VHI

<

SAD 3:0

8-BIT

DAC

<

>

SADB 3:0

MBK960

Fig.12 SAD block diagram.

2000 Feb 23

36

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

15 I²C-BUS SERIAL I/O

16.1 Memory structure

The I²C-bus consists of a serial data (SDA) line and a

serial clock (SCL) line. The definition of the I²C-bus

protocol can be found in the document “The I²C-bus and

how to use it (including specification)”. This document may

be ordered using the code 9398 393 40011.

The memory is partitioned into two distinct areas, the

dedicated Auxiliary RAM area, and the Display RAM area.

The Display RAM area when not being used for Data

Capture or Display can be used as an extension to the

auxiliary RAM area.

The device operates in four modes:

• Master transmitter

• Master receiver

16.1.1 AUXILIARY RAM

The Auxiliary RAM is not initialised at power-up.

Application software must initialize this Auxiliary RAM. The

contents of the Auxiliary RAM area, and the Display RAM

are maintained during Standby and Idle modes, but are

lost if Power-down mode is entered.

• Slave transmitter

• Slave receiver.

The microcontroller peripheral is controlled by the Serial

Control SFR (S1CON) and its status is indicated by the

Status SFR (S1STA). Information is transmitted/received

to/from the I²C-bus using the Data SFR (S1DAT) and the

Slave Address SFR (S1ADR) is used to configure the

slave address of the peripheral.

16.1.2 DISPLAY RAM

The Display RAM (Block 0 only) is initialised on power-up

to a value of 20H. The contents of the Display RAM are

maintained when entering Idle mode. If Idle mode is exited

using an interrupt then the contents are unchanged, if Idle

mode is exited using a reset then the contents are

re-initialised to 20H.

The byte level I²C-bus serial port is identical to the I²C-bus

serial port on the P8xCE558, except for the clock rate

selection bits CR<2:0> in S1CON. The operation of the

subsystem is described in detail in the “P8xCE558 data

sheet”.

Full Closed Caption display requires a display RAM from

8000H to 845FH. The memory from 8460H to 84FFH

(must be initialized by the application software) can be

utilized as an extension to the dedicated contiguous

Auxiliary RAM that occupies 000H to 02FFH.

15.1 I²C-bus port selection

Two I²C-bus ports are available SCL0/SDA0 and

SCL1/SDA1. The selection of the port is done using

TXT21.I²C PORT 0 and TXT21.I²C PORT 1. When the

port is enabled, any information transmitted from the

device goes onto the enabled port. Any information

transmitted to the device can only be acted on if the port is

enabled.

16.2 Memory mapping

The dedicated Auxiliary RAM area occupies 0.75 kbytes,

with an address range from 0000H to 02FFH. The Display

RAM occupies 1.25 kbytes with an address range from

2000H to 24FFH for TXT mode and 8000H to 84FFH for

CC mode. The two modes although having different

address ranges occupy the same physical DRAM area.

If both ports are enabled then data transmitted from the

device is seen on both ports, however data transmitted to

the device on one port can not be seen on the other port.

The hardware will only initialize 1-kbyte (block 0) of the

available 1.25 kbytes on the device. The application

software must initialize this additional 0.25 kbytes if it is to

be used as display RAM or auxiliary RAM.

16 MEMORY INTERFACE

The memory interface controls access to the embedded

DRAM, refreshing of the DRAM and page clearing.

The DRAM is shared between Data Capture, display and

microcontroller sections.

The Data Capture section uses the DRAM to store

acquired information that has been requested. The display

reads from the DRAM information and converts it into RGB

values. The microcontroller uses the DRAM as embedded

auxiliary RAM.

2000 Feb 23

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Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

16.3 Addressing memory

16.4 Page clearing

Page clearing is performed on request from the

microcontroller under the control of the embedded

software.

The memory can be addressed by the microcontroller in

two ways, either directly using a MOVX command, or via

Special Function Registers depending on what address is

required.

At power-on and reset the Text Display memory (from

2000H to 23FFH) is cleared to the value of 20H.

The TXT13.PAGE CLEARING bit will be set while this

takes place.

The dedicated Auxiliary RAM, and Display memory in the

range 8000H to 84FFH, can only be accessed using the

MOVX command.

The Display memory in the range 2000H to 23FFH can

either be directly accessed using the MOVX, or via the

Special Function Registers.

16.4.1 DATA CAPTURE PAGE CLEAR

Not present in the SAA55xx OSD only devices.

16.3.1 TXT DISPLAY MEMORY SFR ACCESS

16.4.2 SOFTWARE PAGE CLEAR

The Display memory when in TXT mode (see Fig.14) is

configured as 40 columns wide by 25 rows and occupies

1K × 8 bits of memory. The row and column is selected

using TXT9.R<4:0> and TXT10.C<5:0>. The data at the

selected position can be read or written using

TXT11.D<7:0>.

The software can also initiate a page clear, by setting the

TXT9.CLEAR MEMORY bit. The CLEAR MEMORY bit is

not latched so the software does not have to reset it after

it has been set.

Only one page can be cleared in a TV line so if the

software requests a page clear it will be carried out on the

next TV line on which the Data Capture hardware does not

force the page to be cleared. A flag, TXT13.PAGE

CLEARING, is provided to indicate that a software

requested page clear is being carried out. The flag is set

when a logic 1 is written into the TXT9.CLEAR MEMORY

bit and is reset when the page clear has been completed.

Whenever a read or write is performed on TXT11, the row

values stored in TXT9 and column value stored in TXT10

are automatically incremented. For rows 0 to 24 the

column value is incremented up to a maximum of 39, at

which point it resets to a logic 0 and increments the row

counter value. When row 25 column 23 is reached the

values of the row and column are both reset to logic 0.

Inventory page clearing in not present in the SAA55xx

OSD only devices.

Writing values outside of the valid range for TXT9 or

TXT10 will cause undetermined operation of the

auto-incrementing function for accesses to TXT11.

16.3.2 TXT DISPLAY MEMORY MOVX ACCESS

It is important for the generation of OSD displays, that use

this mode of access, to understand the mapping of the

MOVX address onto the display row and column value.

This mapping of row and column onto address is shown in

Table 10. The values shown are added onto a base

address for the required memory block (see Fig.13) to give

a 16-bit address.

Table 10 Column and row to MOVX address (lower 10 bits of address)

ROW

Row 0

Row 1

...

COL.0

000H

020H

...

COL.23

017H

037H

...

COL.31

01FH

03FH

...

COL.32

3F8H

3F0H

...

COL.39

3FFH

3F7H

...

Row 23

Row 24

Row 25

2E0H

300H

320H

3F7H

317H

337H

2FFH

31FH

340H

338H

347H

33FH

2000 Feb 23

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Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

lower 32 kbytes

upper 32 kbytes

7FFFH

FFFFH

handbook, halfpage

23FFH

2000H

TEXT DISPLAY

AUXILIARY

84FFH

8000H

02FFH

0000H

CC DISPLAY

GSA011

Fig.13 DRAM memory mapping.

2000 Feb 23

39

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

Column

handbook, full pagewidth

0

10

20

30

39

Row 0

1

C

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

control data

non-displayable data

(byte 10 reserved)

0

9 10

23

<

>

<

>

active position TXT9.R 4:0 = 01H, TXT10.C 5:0 = 0AH, TXT11 = 43H

MBK962

Fig.14 TXT memory map.

2000 Feb 23

40

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

17 DATA CAPTURE

17.1.4 DATA CAPTURE TIMING

The Data Capture section takes in the analog Composite

Video and Blanking Signal (CVBS), and from this extracts

the required data, which is then decoded and stored in

memory.

The Data Capture timing section uses the synchronisation

information extracted from the CVBS signal to generate

the required horizontal and vertical reference timings.

The timing section automatically recognizes and selects

the appropriate timings for either 625 (50 Hz)

synchronisation or 525 (60 Hz) synchronisation.

The extraction of the data is performed in the digital

domain. The first stage is to convert the analog

CVBS signal into a digital form. This is done using an ADC

sampling at 12 MHz. The data and clock recovery is then

performed by a Multi-Rate Video Input Processor

(MulVIP). From the recovered data and clock, the serial

Closed Captioning data is converted to parallel and stored

as two bytes per line. The extracted data is stored in

SFR locations.

A flag TXT12.VIDEO SIGNAL QUALITY is set when the

timing section is locked correctly to the incoming CVBS

signal. When TXT12.VIDEO SIGNAL QUALITY is set

another flag TXT12.525/625 SYNC can be used to identify

the standard.

17.1.5 LINE 21 DATA SERVICES

17.1 Data Capture features

The Line 21 Data Services is transmitted on line 21 of a

525-line broadcast system and is used for Captioning

information, Text information and Extended Data Services.

Full Details can be found in “Recommended Practise for

Line 21 Data Service EIA-608”.

• Two CVBS inputs

• Data Capture for Line 21 Data Service

• Video Signal Quality Detector.

Closed Caption Line 21 data is only acquired when

TXT21.CC ON bit is set.

17.1.1 CVBS SWITCH

The CVBS switch is used to select the required analog

input depending on the value of TXT8.CVBS1/CVBS0.

Two bytes of data are stored per field in SFRs, the first bye

is stored in CCDAT1 and the second byte is stored in

CCDAT2. The contents of each CCDAT register are reset

to 00H at the start of the Closed Caption line defined by

CCLIN.CS<4:0>. At the end of the Closed Caption line an

interrupt is generated if IE.ECC is active.

17.1.2 ANALOG-TO-DIGITAL CONVERTER

The output of the CVBS switch is passed to a differential

to single ended converter, although in this device it is used

in single ended configuration with a reference. The analog

output of the differential to single ended converter is

converted into a digital representation by a full-flash ADC

with a sampling rate of 12 MHz.

The processing of the Closed Caption data to convert into

a displayable format is performed by software.

17.1.3 MULTI-RATE VIDEO INPUT PROCESSOR

The multi-rate video input processor is a Digital Signal

Processor designed to extract the data and recover the

clock from a digitized CVBS signal. The only data and

clock standard that can be recovered in the OSD only

devices is Closed Caption at a data rate of approximately

503.5 kHz.

2000 Feb 23

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Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

CVBS0 CVBS1

handbook, full pagewidth

CVBS

SWITCH

CVBS

SYNC

SEPARATOR

ADC

SYNC_FILTER

<

>

data 7:0

VCS

DATA SLICER

ACQUISITION

TIMING

AND

CLOCK RECOVERY

TTC

TTD

ACQUISITION

FOR

CC/WSS

GSA010

output data to SFRs

Fig.15 Data Capture block diagram.

18 DISPLAY

• Globally selectable scan lines per row 9, 10, 13 or 16

• Globally selectable character matrix (H × V) 12 × 9,

12 × 10, 12 × 13 or 12 × 16

The display section is based on the requirements for US

Closed Caption. There are some enhancements for use

with locally generated On-Screen Displays.

• Italics

• Soft colours using CLUT with 4096 colour palette

• Underline

The display section reads the contents of the Display

memory and interprets the control/character codes. From

this information and other global settings, the display

produces the required RGB signals and video/data (Fast

Blanking) signal for a TV signal processing device.

• Overline

• Fringing (shadow) selectable from N-S-E-W direction

• Fringe colour selectable

• Meshing of defined area

• Contrast reduction of defined area

• Cursor

The display is synchronised to the TV signal processing

device by way of horizontal and vertical sync signals

provided by external circuits (Slave Sync mode). From

these signals all display timings are derived.

• Special Graphics characters with two planes, allowing

four colours per character

18.1 Display features

• Teletext style OSD and Enhanced OSD modes

• US Closed Caption features

• 32 software redefinable On-Screen Display characters

• 4 WST character sets (G0/G2) in single device

(e.g. Latin, Cyrillic, Greek, Arabic)

• Serial and Parallel display attributes

• Single/double/quadruple width and height for characters

• Scrolling of display region

• G1 Mosaic graphics, Limited G3 Line drawing

characters

• Variable flash rate controlled by software

• WST character sets and Closed (including extended)

Caption character set in a single device.

2000 Feb 23

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Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

CLK

VSYNC

handbook, full pagewidth

HSYNC

DISPLAY

TIMING

address

data

PARALLEL/SERIAL

CONVERTER

AND FRINGING

address

data

control

MICROPROCESSOR

INTERFACE

FUNCTION

REGISTERS

address

data

DISPLAY DATA

ADDRESSING

ATTRIBUTE

HANDLING

to memory interface

from memory interface

data

DATA

BUFFER

CLUT RAM

data

CHARACTER

ROM

CHARACTER

FONT

ADDRESSING

AND

DRCs

address

DAC

G

DAC

MBK965

R

B

FB

Fig.16 Display block diagram.

43

2000 Feb 23

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

18.2 Display modes

TXT: This attribute is set by the control character ‘flash’

(08H) and remains valid until the end of the row or until

reset by the control character ‘steady’ (09H).

The display section has two distinct modes with different

features available in each. The two modes are:

• TXT: This is the display configured for WST with

additional serial and global attributes. The display is

configured as a fixed 25 rows with 40 characters per

row. In the OSD only family this mode can only be

utilised for display of Text style OSD, no Teletext Data

Capture is present.

18.3.2 BOXES

CC: This attribute is valid from the time set until end of row

or otherwise modified if set with Serial Mode 0. If set with

Serial Mode 1, then it is set from the next character

onwards.

In Text mode (within CC mode) the background colour is

displayed regardless of the setting of the box attribute bit.

Boxes take effect only during mixed mode, where boxes

are set in this mode the background colour is displayed.

Character locations where boxes are not set show

video/screen colour (depending on the setting in the

MMR Display Control) instead of the background colour.

• CC: This is the display configured as the US Closed

Caption mode. The display is configured as a maximum

of 16 rows with a maximum of 48 characters per row.

In both of the above modes the character matrix, and

TV lines per row can be defined. There is an option of

9, 10, 13 and 16 TV lines per display row, and a character

matrix (H × V) of 12 × 9, 12 × 10, 12 × 13 or 12 × 16. Not all

combinations of TV lines per row and maximum display

rows give a sensible OSD display, since there is a limited

number of TV scan lines available.

TXT: Two types of boxes exist, the teletext box and the

OSD box. The teletext box is activated by the ‘start box’

control character (0BH). Two start box characters are

required to begin a teletext box, with the box starting

between the 2 characters. The box ends at the end of the

line or after a ‘end box’ control character.

Special Function Register TXT21 and memory mapped

registers are used to control the mode selection.

TXT mode can also use OSD boxes, they are started using

size, implying OSD control characters (BCH, BDH, BEH

and BFH). The box starts after the control character (set

after) and ends either at the end of the row or at the next

size implying OSD character (set at).

18.3 Display feature descriptions

All display features are now described in detail for both

TXT and CC modes.

18.3.1 FLASH

The attributes flash, teletext box, conceal, separate

graphics, twist and hold graphics are all reset at the start

of an OSD box, as they are at the start of the row.

OSD boxes are only valid in TV mode which is defined by

TXT5 = 03H and TXT6 = 03H.

Flashing causes the foreground colour pixel to be

displayed as the background pixels.The flash frequency is

controlled by software setting and resetting the MMR

Status (see Table 28) at the appropriate interval.

CC: This attribute is valid from the time set (see Table 16)

until the end of the row or until otherwise modified.

2000 Feb 23

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Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

18.3.3 SIZE

Three vertical sizes are available normal (×1), double (×2)

and quadruple (×4). The control characters ‘normal size’

(0CH/BCH) enable normal size, the ‘double height’ or

‘double size’ (0DH/BDH/0FH/BFH) enable double height

characters. Quadruple height characters are achieved by

using double height characters and setting the global

attributes TXT7.DOUBLE HEIGHT (expand) and

TXT7.BOTTOM/TOP.

The size of the characters can be modified in both the

horizontal and vertical directions.

CC: Two sizes are available in both the horizontal and

vertical directions. The sizes available are normal (×1),

double (×2) height/width and any combination of these.

The attribute setting is always valid for the whole row.

Mixing of sizes within a row is not possible.

If double height characters are used in Teletext mode,

single height characters in the lower row of the double

height character are automatically disabled.

TXT: Three horizontal sizes are available normal (×1),

double (×2) and quadruple (×4). The control characters

‘normal size’ (0CH/BCH) enables normal size, the ‘double

width’ or ‘double size’ (0EH/BEH/0FH/BFH) enables

double width characters.

18.3.4 ITALIC

CC: This attribute is valid from the time set until the end of

the row or otherwise modified. The attribute causes the

character foreground pixels to be offset horizontally by

1 pixel per 4 scan lines (interlaced mode). The base is the

bottom left character matrix pixel. The pattern of the

character is indented as shown in Fig.17.

Any two consecutive combination of ‘double width’ or

‘double size’ (0EH/BEH/0FH/BFH) activates quadruple

width characters, provided quadruple width characters are

enabled by TXT4.QUAD WIDTH ENABLE.

TXT: The Italic attribute is not available.

12 × 16 character matrix

12 × 13 character matrix

8 10 0

12 × 10 character matrix

8 10 0 2 4 6 8 10

handbook, full pagewidth

0

2

4

6

8 10 0

2

4

6

8 10 0

2

4

6

2

4

6

8 10 0

2

4

6

0

1

indented by 7/6/4

2

indented by 6/5/3

indented by 5/4/2

3

4

5

6

indented by 4/3/1

indented by 3/2/0

indented by 2/1

indented by 1/0

7

8

9

10

11

12

13

14

15

indented by 0

MBK970

Field 1

Field 2

Fig.17 Italic characters.

2000 Feb 23

45

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

18.3.5 COLOURS

18.3.7 BACKGROUND COLOUR

A CLUT (Colour Look-Up Table) with 16 colour entries is

provided. The colours are programmable out of a palette

of 4096 (4 bits per R, G and B). The CLUT is defined by

writing data to a RAM that resides in the MOVX address

space of the 80C51.

CC: This attribute is valid from the time set until end of row

or otherwise modified if set with Serial Mode 0. If set with

Serial Mode 1, then the colour is set from the next

character onwards.

The background colour can be chosen from all 16 CLUT

entries.

Table 11 CLUT colour values

TXT: The control character ‘new background’ (1DH) is

used to change the background colour to the current

foreground colour. The selection is immediate (set at) and

remains valid until the end of the row or until otherwise

modified.

RED<3:0> GREEN<3:0 BLUE<3:0> COLOUR

(B11 TO B8) >(B7 TO B4) (B3 TO B0)

ENTRY

0000

....

0000

....

0000

1111

....

0

1

....

14

15

The Text background control characters map to the CLUT

entries as shown in Table 13.

1111

0000

1111

Table 13 Background CLUT mapping

18.3.6 FOREGROUND COLOUR

CONTROL

CODE

DEFINED

COLOUR

CLUT ENTRY

CC: The foreground colour can be chosen from 8 colours

on a character-by-character basis. Two sets of 8 colours

are provided. A serial attribute switches between the

banks (see Table 16, Serial Mode 1, bit 7). The colours are

the CLUT entries 0 to 7 or 8 to 15.

00H + 1DH

01H + 1DH

02H + 1DH

03H + 1DH

04H + 1DH

05H + 1DH

06H + 1DH

07H + 1DH

black

red

8

9

green

yellow

blue

10

11

12

13

14

15

TXT: The foreground colour is selected via a control

character (see Table 16). The colour control characters

take effect at the start of the next character (set-after) and

remain valid until the end of the row, or until modified by a

control character. Only 8 foreground colours are available.

magenta

cyan

white

The text foreground control characters map to the CLUT

entries is shown in Table 12.

18.3.8 BACKGROUND DURATION

The attribute when set takes effect from the current

position until the end of the text display defined in the MMR

Text Area End.

Table 12 Foreground CLUT mapping

CONTROL

CODE

DEFINED

COLOUR

CLUT ENTRY

CC: The background duration attribute (see Table 16,

Serial Mode 1, bit 8) in combination with the End Of Row

attribute (see Table 16, Serial Mode 1, bit 9) forces the

background colour to be displayed on the row until the end

of the text area is reached.

00H

01H

02H

03H

04H

05H

06H

07H

black

red

0

1

2

3

4

5

6

7

green

yellow

blue

TXT: This attribute is not available.

magenta

cyan

white

2000 Feb 23

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Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

18.3.9 UNDERLINE

CC: The fringe attribute (see Table 16, Serial Mode 0,

bit 9) is valid from the time set until the end of the row or

otherwise modified.

The underline attribute causes the characters to have the

bottom scan line of the character cell forced to foreground

colour, including spaces. If background duration is set,

then underline is set until the end of the text area.

TXT: The display of fringing in TXT mode is controlled by

the TXT4.SHADOW ENABLE bit.

CC: The underline attribute (see Table 16, Serial Mode

0/1, bit 4) is valid from the time set until the end of row or

otherwise modified.

When set, all the alphanumeric characters being displayed

are shadowed, graphics characters are not shadowed.

18.3.13 MESHING

TXT: This attribute is not available.

The attribute effects the background colour being

displayed. Alternate pixels are displayed as the

background colour or video.The structure is offset by

1 pixel from scan line to scan line, thus achieving a

checker board display of the background colour and video.

An example of meshing is shown in Fig.19.

18.3.10 OVERLINE

The overline attribute causes the characters to have the

top scan line of the character cell forced to foreground

colour, including spaces. If background duration is set,

then overline is set until the end of the text area.

CC: The setting of the MSH bit in MMR Display Control

has the effect of meshing any background colour.

CC: The overline attribute (see Table 16, Serial Mode 0/1,

bit 5) is valid from the time set until end of row or otherwise

modified. Overlining of italic characters is not possible.

TXT: There are two meshing attributes one that only

affects black background colours TXT4.B MESH ENABLE

and a second that only affects backgrounds other than

black TXT4.C MESH ENABLE. A black background is

defined as CLUT entry 8, a non-black background is

defined as CLUT entry 9 to 15.

TXT: This attribute is not available.

18.3.11 END OF ROW

CC: The number of characters in a row is flexible and can

be determined by the end of row attribute (see Table 16,

Serial Mode 1, bit 9). However, the maximum number of

character positions displayed is determined by the setting

of the MMR Text Position Horizontal and MMR Text Area

End.

18.3.14 CURSOR

The cursor operates by reversing the background and

foreground colours in the character position pointed to by

the active cursor position. The cursor is enabled using

TXT7.CURSOR ON. When active, the row the cursor

appears on is defined by TXT9.R<4:0> and the column is

defined by TXT10.C<5:0>. The position of the cursor can

be fixed using TXT9.CURSOR FREEZE. The cursor

display is shown in Fig.20.

Note that when using the end of row attribute the next

character location after the attribute should always be

occupied by a ‘space’.

TXT: This attribute is not available, row length is fixed at

40 characters.

CC: The valid range for row is 0 to 15. The valid range for

column is 0 to 47. The cursor remains rectangular at all

times, its shape is not affected by italic attribute, therefore

it is not advised to use the cursor with italic characters.

18.3.12 FRINGING

A fringe (shadow) can be defined around characters. The

fringe direction is individually selectable in any of the

North, South, East and West direction using the MMR

Fringing Control. The colour of the fringe can also be

defined as one of the entries in the CLUT, again using

MMR Fringing Control. An example of south and

south-west fringing is shown in Fig.18.

TXT: The valid range for row positioning is 0 to 24.

The valid range for column is 0 to 39.

2000 Feb 23

47

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

handbook, full pagewidth

MBK972

Fig.18 South and south-west fringing.

handbook, full pagewidth

MBK973

Fig.19 Meshing and Meshing/fringing (south + west).

handbook, full pagewidth

A B C D E F

MBK971

Fig.20 Cursor display.

48

2000 Feb 23

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

18.3.15 SPECIAL GRAPHICS CHARACTERS

Table 14 Special character colour allocation

CC/TXT: Several special characters are provided for

improved OSD effects. These characters provide a choice

of four colours within a character cell. The total number of

special graphics characters is limited to 16. They are

stored in the character codes 8XH and 9XH of the

character table (32 ROM characters), or in the DRCs

which overlay character codes 8XH and 9XH. Each

special graphics character uses two consecutive normal

characters.

PLANE 1 PLANE 0

COLOUR ALLOCATION

0

1

0

1

0

1

background colour

foreground colour

CLUT entry 6

CLUT entry 7

If the screen colour is transparent (implicit in mixed mode)

and inside the object the box attribute is set, then the

object is surrounded by video. If the box attribute is not set

the background colour inside the object will also be

displayed as transparent.

Fringing, underline and overline is not possible for special

graphics characters. Special graphics characters are

activated when TXT20.OSD PLANES = 1.

background colour

"set at" (Mode 0)

serial attribute

background colour

"set after" (Mode 1)

handbook, full pagewidth

VOLUME

foreground colour

normal character

background colour

foreground colour 6

foreground colour 7

special character

MGK550

This example could also be done with 8 special characters.

Fig.21 Special character example.

2000 Feb 23

49

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

18.4 Character and attribute coding

Table 15 Parallel character coding

BITS DESCRIPTION

0 to 7 8 bit character code

This section describes the character and attribute coding

for each mode.

8 to 10

11

3 bits for 8 foreground colours

mode bit: 0 = Parallel code

18.4.1 CC MODE

Character coding is split into character oriented attributes

(parallel) and character group coding (serial). The serial

attributes take effect either at the position of the attribute

(set at), or at the following location (set after) and remain

effective until either modified by a new serial attribute or

until the end of the row. A serial attribute is represented as

a space (the space character itself however is not used for

this purpose), the attributes that are still active,

e.g. overline and underline will be visible during the display

of the space.

18.4.2 TXT MODE

Character coding is in a serial format, with only one

attribute being changed at any single location. The serial

attributes take effect either at the position of the attribute

(set at), or at the following location (set after). The attribute

remains effective until either modified by new serial

attributes or until the end of the row.

The default settings at the start of a row are:

• Foreground colour white (CLUT address 7)

• Background colour black (CLUT address 8)

• Horizontal size ×1, vertical size ×1 (normal size)

• Alphanumeric on

The default setting at the start of a row is:

• ×1 size

• Flash off

• Overline off

• Contiguous mosaic graphics

• Release mosaics

• Underline off

• Italics off

• Flash off

• Display mode = superimpose

• Fringing off

• Box off

• Conceal off

• Background colour duration = 0

• End of row = 0.

• Twist off.

The attributes have individual codes which are defined in

the basic character table (see Fig.22).

The coding is done in 12-bit words. The codes are stored

sequentially in the Display memory. A maximum of

768 character positions can be defined for a single display.

2000 Feb 23

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Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

Table 16 Serial character coding

DESCRIPTION

BIT

SERIAL MODE 1

SERIAL MODE 0

(SET AT)

CHAR.POS. 1 (SET AT)

CHAR.POS. >1 (SET AFTER)

0 to 3 4 bits for 16 background colours

4 bits for 16 background colours

4

5

6

7

8

Underline switch:

0 = underline off

1 = underline on

Horizontal size:

0 = normal

1 = ×2

Underline switch:

0 = underline off

1 = underline on

Overline switch:

0 = overline off

1 = overline on

Vertical size:

0 = normal

1 = ×2

Overline switch:

0 = overline off

1 = overline on

Display mode:

0 = superimpose

1 = boxing

Display mode:

0 = superimpose

1 = boxing

Display mode:

0 = superimpose

1 = boxing

Flash switch:

0 = ﬂash off

1 = ﬂash on

Foreground colour switch:

0 = Bank 0 (colours 0 to 7)

1 = Bank 1 (colours 8 to 15)

Foreground colour switch:

0 = Bank 0 (colours 0 to 7)

1 = Bank 1 (colours 8 to 15)

Italics switch

0 = italics off

1 = italics on

Background colour duration:

0 = stop BGC

1 = set BGC to end of row

Background colour duration (set

at):

0 = stop BGC

1 = set BGC to end of row

9

Fringing switch:

0 = fringing off

1 = fringing on

End of row:

0 = continue row

1 = end row

End of row (set at):

0 = continue row

1 = end row

10

11

Switch for serial coding:

0 = mode 0

1 = mode 1

Switch for serial coding:

0 = mode 0

1 = mode 1

Switch for serial coding

0 = mode 0

1 = mode 1

Mode bit:

1 = serial code

2000 Feb 23

51

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

18.5 Screen and global controls

18.5.3 DISPLAY MODES

A number of attributes are available that affect the whole

display region, and cannot be applied selectively to

regions of the display.

CC: When attributes superimpose or boxing (see

Table 16, Serial Mode 0/1, bit 6) are set, the resulting

display depends on the setting of the following screen

control mode bits in the MMR Display Control.

18.5.1 TV SCAN LINES PER ROW

TXT: The display mode is controlled by the bits in the

TXT5 and TXT6 registers. There are three control

functions - Text on, Background on and Picture on.

Separate sets of bits are used inside and outside teletext

boxes so that different display modes can be invoked.

TXT6 is used if the newsflash (C5) or subtitle (C6) bits in

row 25 of the basic page memory are set otherwise TXT5

is used. This allows the software to set up the type of

display required on newsflash and subtitle pages (e.g. text

inside boxes, TV picture outside) this will be invoked

without any further software intervention when such a

page is acquired.

The number of TV scan lines per field used for each

display row can be defined, the value is independent of the

character size being used. The number of lines can be

either 10, 13 or 16 per display row. The number of TV scan

lines per row is defined TXT21.DISP LINES<1:0>.

A value of 9 lines per row can be achieved if the display is

forced into 525-line display mode by

TXT17.FORCE DISP<1:0>, or if the device is in 10 line

mode and the automatic detection circuitry within display

finds 525-line display syncs.

18.5.2 CHARACTER MATRIX (H X V)

When teletext box control characters are present in the

display page memory, the appropriate box control bit must

be set, TXT7.BOX ON 0, TXT7.BOX ON 1 − 23 or

TXT7.BOX ON 24. This allows the display mode to be

different inside the teletext box compared to outside.

These bits are present to allow boxes in certain areas of

the screen to be disabled. The use of teletext boxes for

OSD messages has been superseded in this device by the

OSD box concept, but these bits remain to allow teletext

boxes to be used, if required.

There are three different character matrices available,

these are 12 x 10, 12 x 13 and 12 x 16. The selection is

made using TXT21.CHAR SIZE<1:0> and is independent

of the number of display lines per row.

If the character matrix is less than the number of TV scan

lines per row then the matrix is padded with blank lines. If

the character matrix is greater than the number of TV scan

lines then the character is truncated.

Table 17 Display modes

MOD 0 MOD 1

DISPLAY MODE

Video

Full Text

DESCRIPTION

0

1

0

Disables all display activities, sets the RGB to true black and VDS to video.

Displays screen colour at all locations not covered by character foreground

or background colour. The box attribute has no effect.

0

1

Mixed Screen Colour Displays screen colour at all locations not covered by character foreground,

within boxed areas or, background colour.

Mixed Video

Mixed Video mode displays video at all locations not covered by character

foreground, within boxed areas or, background colour.

Table 18 TXT display control bits

PICTURE ON

TEXT ON

BACKGROUND ON

EFFECT

Text mode, black screen

0

1

0

1

0

1

X

0

1

X

0

1

Text mode, background always black

Text mode

Video mode

Mixed text and TV mode

Text mode, TV picture outside text area

18.5.4 SCREEN COLOUR

2000 Feb 23

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Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

Screen colour is displayed from 10.5 ms to 62.5 ms after

the active edge of the HSYNC input and on TV lines

23 to 310 inclusive, for a 625-line display, and lines

17 to 260 inclusive for a 525-line display.

18.6.2 DISPLAY MAP

The display map allows a flexible allocation of data in the

memory to individual rows.

Sixteen words are provided in the display memory for this

purpose. The lower 10 bits address the first word in the

memory where the row data starts. This value is an offset

in terms of 16-bit words from the start of Display memory

(8000H). The most significant bit enables the display when

not within the scroll (dynamic) area.

CC: The screen colour is defined by the MMR Display

Control and points to a location in the CLUT table.

The screen colour covers the full video width. It is visible

when the Full Text or Mixed Screen Colour mode is set

and no foreground or background pixels are being

displayed.

The display map memory is fixed at the first 16 words in

the Closed Caption display memory.

TXT: The register bits TXT17.SCREEN COL<2:0> can be

used to define a colour to be displayed in place of

TV picture and the black background colour. If the bits are

all set to zero, the screen colour is defined as ‘transparent’

and TV picture and background colour are displayed as

normal. Otherwise the bits define CLUT entries 9 to 15.

Table 19 Display map bit allocation

BIT

FUNCTION

11

Text display enable, valid outside soft

scroll area. 0 = disable; 1 = enable.

18.6 Text display controls

10

This bit is reserved, should be set to

logic 0.

18.6.1 TEXT DISPLAY CONFIGURATION (CC MODE)

9 to 0

Pointer to row data.

Two types of areas are possible. The one area is static and

the other is dynamic. The dynamic area allows scrolling of

a region to take place. The areas cannot cross each other.

Only one scroll region is possible.

2000 Feb 23

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Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

handbook, full pagewidth

Display memory

Text area

ROW

0

1

2

3

4

5

6

7

8

9

0

1

2

3

4

10

11

3

4

9

display

possible

soft scrolling

display possible

Enable

bit = 0

display

map

entries

10

11

12

13

14

15

11

12

13

14

15

display

possible

MBK966

display

data

Fig.23 Display map and data pointers.

2000 Feb 23

55

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

18.6.3 SOFT SCROLL ACTION

If the number of rows allocated to the scroll counter is

larger than the defined visible scroll area, this allows parts

of rows at the top and bottom to be displayed during the

scroll function. The registers can be written throughout the

field and the values are updated for display with the next

field sync. Care should be taken that the register pairs are

written to by the software in the same field.

The dynamic scroll region is defined by the MMR Scroll

Area, MMR Scroll Range, MMR Top Scroll line and the

MMR Status. The scroll area is enabled when the SCON

bit is set in MMR Status.

The position of the soft scroll area window is defined using

the Soft Scroll Position (SSP<3:0>), and the height of the

window is defined using the Soft Scroll Height (SSH<3:0>)

both are in MMR Scroll Range. The rows that are scrolled

through the window are defined using the Start Scroll Row

(STS<3:0>) and the Stop Scroll Row (SPS<3:0>) both are

in MMR Scroll Area.

Only a region that contains only single height rows or only

double height rows can be scrolled.

TXT: The display is organised as a fixed size of 25 rows

(0 to 24) of 40 columns (0 to 39), This is the standard size

for teletext transmissions. The control data in row 25 is not

displayed but is used to configure the display page

correctly.

The soft scrolling function is done by modifying the Scroll

Line (SCL<3:0>) in MMR Top Scroll Line. and the first

scroll row value SCR<3:0> in the MMR Status.

ROW

handbook, full pagewidth

0

1

2

3

4

5

6

7

start scroll row

usable for

OSD display

<

>

STS 3:0 e.g. 3

soft scrolling area

start scroll row

soft scroll position

<

>

pointer SSP 3:0 e.g. 6

should not be used

for OSD display

soft scroll height

<

>

SSH 3:0 e.g. 4

8

9

should not be used

for OSD display

10

11

12

13

14

15

usable for

OSD display

<

>

SPS 3:0 e.g. 11

MBK967

Fig.24 Soft scroll area.

2000 Feb 23

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Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

0-63

lines

handbook, full pagewidth

ROW

row0

0

1

2

row1

P01 NBC

row2

row3

row4

row5

row6

row7

row8

3

scroll area

offset

4

5

6

7

8

9

Closed Captioning data row n

Closed Captioning data row n+1

Closed Captioning data row n+2

Closed Captioning data row n+3

10

11

12

13

14

15

visible area

for scrolling

Closed Captioning data row n+4

row13

row14

MBK977

Fig.25 CC text areas.

2000 Feb 23

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Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

handbook, full pagewidth

0

39

Row 0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

control data

non-displayable data

byte 10 reserved

0

9 10

23

MBK968

Fig.26 TXT text area.

2000 Feb 23

58

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

18.7 Display positioning

The display consists of the screen colour covering the whole screen and the text area that is placed within the visible

screen area.

The screen colour extends over a large vertical and horizontal range so that no offset is needed. The text area is offset

in both directions relative to the vertical and horizontal sync pulses.

handbook, full pagewidth

horizontal sync

6 lines

offset

screen colour

offset = 8 µs

text

vertical

offset

SCREEN COLOUR AREA

TEXT AREA

horizontal

sync

delay

vertical

sync

0.25 character

offset

text area start

text area end

MGL150

56 µs

Fig.27 Display area positioning.

2000 Feb 23

59

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

18.7.1 SCREEN COLOUR DISPLAY AREA

The width of the text area is defined in the MMR Text Area

End Register by setting the end character value

TAE<5:0>. This number determines where the

background colour of the Text Area will end if set to extend

to the end of the row. It will also terminate the character

fetch process thus eliminating the necessity of a row end

attribute. This entails however writing to all positions.

This area is covered by the screen colour. The screen

colour display area starts with a fixed offset of 8 µs from

the leading edge of the horizontal sync pulse in the

horizontal direction. A vertical offset is not necessary.

Table 20 Screen colour display area

The vertical offset is set in the MMR Text Position Vertical.

The offset value VOL<5:0> is done in number of TV scan

lines.

POSITION

525-LINE

Horizontal

Start at 8 µs after leading edge of

horizontal sync for 56 µs.

Note that the Text Position Vertical Register should not be

set to 00H as the Display Busy interrupt is not generated

in these circumstances.

Vertical

Line 9, Field 1 (321, Field 2) to leading

edge of vertical sync (line numbering

using 625 standard).

18.8 Character set

18.7.2 TEXT DISPLAY AREA

To facilitate the global nature of the device the character

set has the ability to accommodate a large number of

characters, which can be stored in different matrices.

The text area can be defined to start with an offset in both

the horizontal and vertical direction.

Table 21 Text display area

18.8.1 CHARACTER MATRICES

POSITION

DESCRIPTION

The character matrices that can be accommodated in both

display modes are:

Horizontal

Up to 48 full sized characters per row.

Start position setting from 8 to 64

characters from the leading edge of

horizontal sync. Fine adjustment in

quarter characters.

(H × V × planes) 12 × 9 × 1, 12 × 10 × 1, 12 × 13 × 1,

12 × 16 × 1.

These modes allow two colours per character position.

In CC mode two additional character matrices are

available to allow four colours per character.

Vertical

256 lines (nominal 41 to 297). Start

position setting from leading edge of

vertical sync, legal values are

4 to 64 lines (line numbering using

625 standard).

(H × V × planes) 12 × 13 × 2, 12 × 16 × 2.

The characters are stored physically in ROM in a matrix of

size either 12 × 10 or 12 × 16.

The horizontal offset is set in the MMR Text Area Start.

The offset is done in full width characters using TAS<5:0>

and quarter characters using HOP<1:0> for fine setting.

The values 00H to 08H for TAS<5:0> will result in a

corrupted display.

The value 09H should also be avoided in the MMR Text

Area Start as corruption of the row 24 display can occur.

Alternative values are C8H or 49H to overcome this

problem.

2000 Feb 23

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Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

18.8.2 CHARACTER SET SELECTION

The alternative/twist character set is defined by

TXT19.TS<1:0>. Since the alternative character set is an

option it can be enabled or disabled using TXT19.TEN,

and the language code that is defined for the alternative

set is defined by TXT19.TC<2:0>.

Four character sets are available in the device. A set can

consist of alphanumeric characters as required by the

WST or US Closed Captioning, Customer definable

On-Screen Display characters, and Special Graphic

characters.

The National option table is selected using

TXT18.NOT<3:0>. A maximum of 31 National option

tables can be defined when combined with the

EAST/WEST control bit located in register TXT4.

CC: Only a single character set can be used for display

and this is selected using the Basic Set selection

TXT18.BS<1:0>. When selecting a character set in

CC mode, the Twist Set selection TXT19.TS<1:0> should

be set to the same value as TXT18.BS<1:0> for correct

operation.

An example of the character set selection and definitions

is show in Table 22.

An example of the National option reference table is shown

in Table 23. Only a certain number of national options will

be relevant for each of the Character sets.

TXT: Two character sets can be displayed at once. These

are the basic G0 set or the alternative G0 set (Twist Set).

The basic set is selected using TXT18.BS<1:0>.

Table 22 Character set selection

BS1/TS1

BS0/TS0

CHARACTER SET

EXAMPLE LANGUAGE

0

1

0

1

0

1

Set 0

Set 1

Set 2

Set 3

Latin

Greek

−

Closed Caption

Table 23 National option selection

C12

C13

C14

NOT<3:0> = 0000 NOT<3:0> = 0001 NOT<3:0> = 0010

...

NOT<3:0> = 1110

0

1

0

1

0

1

0

1

0

1

0

1

0

1

English

German

Swedish

Italian

French

Spanish

Czech

−

Polish

German

Swedish

Italian

French

−

English

German

Swedish

Italian

...

Polish

German

Estonian

Lettish

Russian

Serb-Croat

Czech

French

Spanish

Turkish

−

Czech

−

2000 Feb 23

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Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

18.9 ROM addressing

Three ROMs are used to generate the correct pixel information. The first contains the National option look-up table, the

second contains the Basic character look-up table and the third contains the Character pixel information.

Although these are individual ROMs, since they do not need to be accessed simultaneously they are all combined into

a single ROM unit.

2400H

handbook, full pagewidth

CHARACTER PIXEL DATA

(71680 × 12-BIT)

0800H

LOOK-UP SET 3

LOOK-UP SET 2

LOOK-UP SET 1

LOOK-UP SET 0

0600H

0400H

0200H

0000H

710 TEXT

OR

+

430 TEXT 176 CC

0800H

0000H

LOOK-UP

BASIC + NATIONAL OPTION

2048 LOCATIONS

MBK978

Fig.28 ROM organisation.

2000 Feb 23

62

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

18.9.1 CHARACTER TABLE

CC: The character table is shown in Fig.29.

TXT: One of the character set options (Pan-European: Latin) is shown in Fig.22.

handbook, full pagewidth

Character code columns (bits 4 to 7)

0

1

2

SP

!

3

0

1

2

3

4

5

6

7

8

9

:

4

5

P

Q

R

S

T

U

V

W

X

Y

Z

[

6

ú

a

b

c

d

e

f

7

p

q

r

8

9

A

B

C

D

E

F

®

@

0

1

A

B

C

D

E

F

G

H

I

˚

1/2

¿

2

"

#

s

t

3

4

™

¢

$

5

%

&

u

v

w

x

y

z

ç

6

£

g

h

i

7

´

(

8

à

_

è

â

ê

î

9

)

A

B

C

D

E

F

á

+

,

j

J

;

k

l

K

L

<

=

>

?

é

-

]

m

n

o

Ñ

ñ

n

M

N

O

ô

û

.

/

Í

ó

MBK976

Special characters in column 8 and 9

Additional table locations for normal characters

Table locations for normal characters

Fig.29 Closed Caption character table.

2000 Feb 23

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Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

18.10 Redeﬁnable characters

The remapping of the standard OSD to the DRCs is

activated when the TXT20.DRCS ENABLE bit is set.

The selection of Normal or Special OSD symbols is

defined by the TXT20.OSD PLANES.

A number of Dynamically Redefinable Characters (DRCs)

are available. These are mapped onto the normal

character codes, and replace the predefined ROM value.

Each character is stored in a matrix of 12 × 16 × 1

(V × H × planes), this allows for all possible character

matrices to be defined within a single location.

There are 32 DRCs, the first 16 occupy the character

codes 80H to 8FH, the second 16 occupy the locations

90H to 9FH. This allows for 32 DRCs or 16 Special DRCs.

handbook, full pagewidth

address (HEX)

8800

character code

80H

CHARACTER 0

CHARACTER 1

CHARACTER 2

881F

8820

character 0

address (HEX)

81H

82H

00

01

02

03

04

05

06

07

08

09

0A

0B

0C

0D

0E

0F

883F

8840

885F

A

8BC0

CHARACTER 30

CHARACTER 31

9EH

9FH

8BDF

8BE0

12 bits

8BFF

MBK969

Fig.30 Organisation of DRC RAM.

2000 Feb 23

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Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

18.11 Display synchronization

Table 25 RGB brightness

The horizontal and vertical synchronizing signals from the

TV deflection are used as inputs. Both signals can be

inverted before being delivered to the Phase Selector

section.

BRI3 TO BRI0

RGB BRIGHTNESS

0000

...

lowest value

...

1111

highest value

CC: The polarity is controlled using either VPOL or HPOL

bits in the MMR Text Position Vertical.

18.15 Contrast reduction

TXT: The TXT1.H POLARITY and TXT1.V POLARITY bits

control the polarity.

CC: This feature is not available in CC mode.

TXT: The COR bits in SFRs TXT5 and TXT6 control when

the COR output of the device is activated (i.e. pulled

LOW). This output is intended to act on the TV’s display

circuits to reduce contrast of the video when it is active.

The result of contrast reduction is to improve the

A line locked 12 MHz clock is derived from the 12 MHz free

running oscillator by the Phase Selector. This line locked

clock is used to clock the whole of the Display block.

The horizontal and vertical sync signals are synchronized

with the 12 MHz clock before being used in the display

section.

readability of the text in a mixed teletext and video display.

The bits in the TXT5 and TXT6 SFRs allow the display to

be set up so that, for example, the areas inside teletext

boxes will be contrast reduced when a subtitle is being

displayed but that the rest of the screen will be displayed

as normal video.

18.12 Video/Data switch (Fast Blanking) polarity

The polarity of the video/data (Fast Blanking) signal can be

inverted. The polarity is set with the VDSPOL bit in the

MMR RGB Brightness.

19 MEMORY MAPPED REGISTERS (MMR)

Table 24 Fast blanking signal polarity

The memory mapped registers are used to control the

display. The registers are mapped into the microcontroller

MOVX address space, starting at address 87F0H and

extending to 87FFH.

VDSPOL

VDS

CONDITION

RGB display

Video display

RGB display

Video display

0

1

0

1

Table 26 MMR address summary

REGISTER

NUMBER

MEMORY

ADDRESS

FUNCTION

18.13 Video/data switch adjustment

To take into account the delay between the RGB values

and the VDS signal due to external buffering, the

VDS signal can be moved in relation to the RGB signals.

The VDS signal can be set to be either a clock cycle before

or after the RGB signal, or coincident with the RGB signal.

This is done using VDEL<2:0> in the MMR Configuration.

0

1

87F0H

87F1H

87F2H

87F3H

87F4H

87F5H

87F6H

87F7H

87F8H

87F9H

87FAH

87FBH

87FCH

87FDH

87FEH

87FFH

Display Control

Text Position Vertical

Text Area Start

Fringing Control

Text Area End

Scroll Area

2

3

4

5

18.14 RGB brightness control

6

Scroll Range

RGB Brightness

Status

7

A brightness control is provided to allow the RGB upper

output voltage level to be modified. The nominal value is

1 V into a 150 Ω resistor, but can be varied between

0.7 V and 1.2 V.

8

9

reserved

10

11

12

13

14

15

reserved

The brightness is set in MMR RGB Brightness.

HSYNC Delay

VSYNC Sync Delay

Top Scroll Line

Conﬁguration

2000 Feb 23

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Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

Table 27 MMR map

ADD R/W

NAME

7

6

5

4

3

2

1

0

RESET

87F0 R/W Display

Control

SRC3

SRC2

SRC1

SRC0

−

MSH

MOD1 MOD0

00H

87F1 R/W Text Position VPOL

Vertical

HPOL

HOP0

FRC2

−

VOL5

TAS5

FRC1

TAE5

VOL4

TAS4

FRC0

TAE4

VOL3

TAS3

FRDN

TAE3

VOL2

TAS2

FRDE

TAE2

VOL1

TAS1

FRDS

TAE1

VOL0

TAS0

FRDW

TAE0

00H

87F2 R/W Text Area

Start

HOP1

FRC3

−

87F3 R/W Fringing

Control

87F4 R/W Text Area

End

87F5 R/W Scroll Area

SSH3

SSH2

SPS2

−

SSH1

SPS1

−

SSH0

SPS0

−

SSP3

STS3

BRI3

SSP2

STS2

BRI2

SSP1

STS1

BRI1

SSP0

STS0

BRI0

00H

87F6 R/W Scroll Range SPS3

87F7 R/W RGB VDSPOL

Brightness

Status

87F8

R

BUSY

FIELD

−

SCON FLR

SCR3

HSD3

SCR2

HSD2

SCR1

HSD1

SCR0

HSD0

00H

W

−

87FC R/W HSYNC

Delay

HSD6

HSD5

VSD5

−

HSD4

87FD R/W VSYNC

Delay

−

VSD6

VSD4

VSD3

SCL3

VSD2

SCL2

−

VSD1

SCL1

−

VSD0

SCL0

−

00H

87FE R/W Top Scroll

Line

−

87FF R/W Conﬁguration CC

VDEL2 VDEL1 VDEL0 TXT/V

2000 Feb 23

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Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

Table 28 MMR bit deﬁnition

REGISTER BIT

Display Control

FUNCTION

SRC3 to SRC0

MSH

screen colour deﬁnition

meshing all background colours (logic 1)

00 = Video

MOD1 to MOD0

01 = Full Text

10 = Mixed Screen Colour

11 = Mixed Video

Text Position Vertical

VPOL

inverted input polarity (logic 1)

HPOL

VOL5 to VOL0

display start vertical offset from VSYNC (lines)

Text Area Start

HOP1 to HOP0

TAS5 to TAS0

ﬁne horizontal offset in quarter of characters

text area start

Fringing Control

FRC3 to FRC0

FRDN

fringing colour, value address of CLUT

fringe in north direction (logic 1)

fringe in east direction (logic 1)

fringe in south direction (logic 1)

fringe in west direction (logic 1)

FRDE

FRDS

FRDW

Text Area End

TAE5 to TAE0

Scroll Area

text area end, in full characters

SSH3 to SSH0

SSP3 to SSP0

soft scroll height

soft scroll position

Scroll Range

SPS3 to SPS0

STS3 to STS0

stop scroll row

start scroll row

RGB Brightness

VDSPOL

VDS polarity

0 = RGB (1), Video (0)

1 = RGB (0), Video (1)

RGB brightness control

BRI3 to BRI0

2000 Feb 23

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TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

REGISTER BIT

Status read

FUNCTION

BUSY

access to display memory could cause display problems (logic 1)

even ﬁeld (logic 1)

FIELD

FLR

active ﬂash region background only displayed (logic 1)

ﬁrst scroll row

SCR3 to SCR0

Status write

SCON

scroll area enabled (logic 1)

FLR

active ﬂash region background colour only displayed (logic 1)

ﬁrst scroll row

SCR3 to SCR0

HSYNC Delay

HSD6 to HSD0

VSYNC Delay

VSD6 to VSD0

Top Scroll Line

SCL3 to SCL0

Conﬁguration

HSYNC delay, in full size characters

VSYNC delay in number of 8-bit 12 MHz clock cycles

top line for scroll

CC

closed caption mode (logic 1)

VDEL2 to VDEL0

pixel delay between VDS and RGB output

000 = VDS switched to video, not active

001 = VDS active one pixel earlier then RGB

010 = VDS synchronous to RGB

100 = VDS active one pixel after RGB

BUSY signal switch; horizontal (logic 1)

TXT/V

2000 Feb 23

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TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

20 LIMITING VALUES

In accordance with Absolute Maximum Rating System (IEC 60134).

SYMBOL

V_DDX

PARAMETER

CONDITIONS

MIN.

−0.5

MAX.

UNIT

supply voltage (all supplies)

input voltage (any input)

output voltage (any output)

output current (each output)

DC input or output diode current

ambient temperature

+4.0

V

V_I

note 1

−0.5

−

V_DD+ 0.5 or 4.1

V_DD+ 0.5

±10

V_O

I_O

mA

°C

I_IOK

T_amb

T_stg

−

±20

−20

−55

+70

storage temperature

+125

°C

Note

1. This maximum value refers to 5 V tolerant I/Os and may be 6 V maximum, but only when V_DDis present.

21 CHARACTERISTICS

V_DD= 3.3 V ± 10%; V_SS= 0 V; T_amb= −20 to +70 °C; unless otherwise speciﬁed.

SYMBOL

Supplies

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

V_DDX

I_DDP

any supply voltage (V_DDto V_SS

Periphery supply current

core supply current

)

3.0

1

3.3

−

3.6

−

V

note 1

mA

µA

I_DDC

−

12

18

I_DDC(id)

I_DDC(pd)

Idle mode core supply current

−

383

666

600

900

Power-down mode core supply

current

−

I_DDC(stb)

Standby mode core supply

current

−

5.1

9

mA

I_DDA

analog supply current

−

45

48

mA

µA

I_DDA(id)

I_DDA(pd)

Idle mode analog supply current

444

433

700

Power-down mode analog supply

current

I_DDA(stb)

Standby mode analog supply

current

−

809

950

µA

Digital inputs

RESET

V_IL

LOW-level input voltage

HIGH-level input voltage

−

1.00

−

V

V_IH

1.85

0.44

V_hys

hysteresis voltage of Schmitt

trigger input

0.58

I_LI

input leakage current

V_I= 0

−

0.17

µA

kΩ

R_pd

equivalent pull-down resistance

V_I= V_DD

55.73

70.71

92.45

2000 Feb 23

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Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

HSYNC AND VSYNC

V_IL

LOW-level input voltage

HIGH-level input voltage

−

0.96

V

V_IH

V_hys

1.80

0.40

−

hysteresis voltage of Schmitt

trigger input

0.56

I_LI

input leakage current

V_I= 0 to V_DD

−

0.00

µA

Digital outputs

FRAME, VDS

V_OL

V_OH

t_r

LOW-level output voltage

I_OL= 3 mA

I_OH= 3 mA

−

0.13

−

V

HIGH-level output voltage

output rise time

2.84

7.50

V

10% to 90%;

C_L= 70 pF

8.85

10.90

ns

t_f

output fall time

10% to 90%;

C_L= 70 pF

6.70

7.97

10.00

ns

COR (OPEN-DRAIN OUTPUT)

V_OL

V_OH

LOW-level output voltage

I_OL= 3 mA

−

0.14

V

HIGH-level pull-up output voltage I_OL= −3 mA;

2.84

−

push-pull

V_IL

V_IH

I_LI

LOW-level input voltage

HIGH-level input voltage

−

0.00

5.50

0.12

11.10

V

0.00

−

V

input leakage current

output rise time

V_I= 0 to V_DD

−

µA

ns

t_f

10% to 90%;

C_L= 70 pF

7.20

8.64

output fall time

10% to 90%;

C_L= 70 pF

4.90

7.34

9.40

ns

Digital input/outputs

P0.0 TO P0.4, P0.7, P1.0 TO P1.1, P2.1 TO P2.7, P3.0 TO P3.7

V_IL

LOW-level input voltage

HIGH-level input voltage

−

0.98

−

V

V_IH

V_hys

1.78

0.41

hysteresis voltage of Schmitt

trigger input

0.55

I_LI

input leakage current

V_I= 0 to V_DD

I_OL= 4 mA

−

0.01

0.18

5.50

µA

V

V_OL

V_OH

LOW-level output voltage

HIGH-level output voltage

−

I_OH= −4 mA

2.81

V

push-pull

t_r

t_f

output rise time

output fall time

10% to 90%;

C_L= 70 pF

push-pull

6.50

5.70

8.47

7.56

10.70

10.00

ns

10% to 90%;

C_L= 70 pF

2000 Feb 23

70

Philips Semiconductors

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TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

P1.2, P1.3 AND P2.0

V_IL

LOW-level input voltage

HIGH-level input voltage

−

0.99

V

V_IH

V_hys

1.80

0.42

−

hysteresis voltage of Schmitt

trigger input

0.56

I_LI

input leakage current

V_I= 0 to V_DD

I_OL= 4 mA

−

0.02

0.17

5.50

µA

V

V_OL

V_OH

LOW-level output voltage

HIGH-level output voltage

−

I_OH= −4 mA

2.81

V

push-pull

t_r

output rise time

output fall time

10% to 90%;

C_L= 70 pF

push-pull

7.00

5.40

8.47

7.36

10.50

9.30

ns

t_f

10% to 90%;

C_L= 70 pF

P0.5 AND P0.6

V_IL

LOW-level input voltage

HIGH-level input voltage

input leakage current

−

0.98

−

V

V_IH

I_LI

1.82

−

V

V_I= 0 to V_DD

I_OL= 8 mA

0.11

0.58

0.20

5.50

µA

V

V_hys

V_OL

V_OH

hysteresis of Schmitt trigger input

LOW-level output voltage

HIGH-level output voltage

0.42

−

V

I_OH= −8 mA

2.76

V

push-pull

t_r

t_f

output rise time

output fall time

10% to 90%;

C_L= 70 pF

push-pull

7.40

4.20

8.22

4.57

8.80

5.20

ns

10% to 90%;

C_L= 70 pF

P1.4 TO P1.7 (OPEN-DRAIN)

V_IL

LOW-level input voltage

−

1.08

−

V

V_IH

V_hys

HIGH-level input voltage

1.99

0.49

hysteresis voltage of Schmitt

trigger input

0.60

I_LI

input leakage current

LOW-level output voltage

output fall time

V_I= 0 to V_DD

I_OL= 8 mA

−

0.13

µA

V

V_OL

t_f

−

0.35

10% to 90%;

C_L= 70 pF

69.70

83.67

103.30

ns

Analog inputs

CVBS0 AND CVBS1

V_sync

sync voltage amplitude

0.1

0.7

0.3

1.0

0.6

1.4

V

V_vid(p-p)

video input voltage amplitude

(peak-to-peak value)

Z_source

source impedance

0

−

250

Ω

2000 Feb 23

71

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

SYMBOL

V_IH

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

HIGH-level input voltage

input capacitance

3.0

−

V_DDA+ 0.3

10

V

C_I

−

pF

IREF

R_gnd

resistor to ground

resistor

−

24

−

kΩ

tolerance 2%

ADC0 TO ADC3

V_IH

C_I

HIGH-level input voltage

−

V_DDA

10

V

input capacitance

pF

VPE

V_IH

HIGH-level input voltage

−

9.0

V

Analog outputs

R, G AND B

I_OL

I_OH

output current (Black Level)

V_DDA= 3.3 V

−10

−

+10

7.3

µA

output current (maximum

Intensity)

V_DDA= 3.3 V

Intensity level

code = 15 dec

6.0

6.67

4.7

mA

output current (70% of full

Intensity)

V_DDA= 3.3 V

4.2

5.1

mA

Intensity level

code = 0 dec

R_load

C_L

load resistor to V_SSA

load capacitance

resistor

tolerance 5%

−

150

−

Ω

−

15

pF

Analog input/output

SYNC_FILTER

C_sync

V_sync

storage capacitor to ground

−

100

−

nF

V

sync ﬁlter level voltage for

nominal sync amplitude

0.35

0.55

0.75

Crystal oscillator

XTALIN

V_IL

V_IH

C_I

LOW-level input voltage

V_SSA

−

V

HIGH-level input voltage

input capacitance

−

V_DDA

10

V

pF

XTALOUT

C_O

output capacitance

−

10

pF

2000 Feb 23

72

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Crystal speciﬁcation; notes 2 and 3

f_xtal

nominal frequency

fundamental

mode

−

12

−

MHz

C_L

C₁

R_r

crystal load capacitance

crystal motional capacitance

resonance resistance

−

30

20

60

−

pF

fF

T_amb= 25 °C

Ω

C_osc

C₀

T_xtal

X_j

capacitors at XTALIN, XTALOUT T_amb= 25 °C

note 4

pF

°C

crystal holder capacitance

temperature range

adjustment tolerance

drift

T_amb= 25 °C

−

note 5

−20

−

+25

−

+85

T_amb= 25 °C

±50 × 10⁻⁶

±100 × 10⁻⁶

X_d

−

Notes

1. Peripheral current is dependent on external components and voltage levels on I/Os.

2. Crystal order number 4322 143 05561.

3. If the 4322 143 05561 crystal is not used, then the formulae in the crystal specification should be used. Where

_IO= 7 pF, the mean of the capacitances due to the chip at XTALIN and at XTALOUT. C_extis a value for the mean

C

of the stray capacitances due to the external circuit at XTALIN and XTALOUT. The maximum value for the crystal

holder capacitance is to ensure start-up − C_oscmay need to be reduced from the initially selected value.

4. C_osc(typ)= 2C_L– (C_IO– C_ext

)

1

2

5. C_0(max)= 35 – (C _osc+ C_IO+ C_ext

)

--

2000 Feb 23

73

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

Table 29 I²C-bus characteristics

FAST-MODE I²C-bus

MIN. MAX.

400

SYMBOL

PARAMETER

UNIT

kHz

f_SCL

SCL clock frequency

0

t_BUF

bus free time between a STOP and START condition

1.3

0.6

−

µs

t_HD;STA

hold time (repeated) START condition. After this period, the ﬁrst

clock pulse is generated.

t_LOW

t_HIGH

t_SU;STA

t_HD;DAT

t_SU;DAT

t_r

LOW period of the SCL clock

1.3

0.6

0

−

µs

ns

µs

pF

HIGH period of the SCL clock

−

set up time for a repeated START condition

data hold time; notes 1 and 2

−

0.9

−

data set up time; note 3

100

20

0.6

−

rise time of both SDA and SCL signals; note 4

fall time of both SDA and SCL signals; note 4

set up time for STOP condition

300

−

t_f

t_SU;STO

C_b

capacitive load for each bus line

400

Notes

1. A device must internally provide a hold time of at least 300 ns for the SDA signal (referred to the V_IH(min) of the SCL

signal) in order to bridge the undefined region of the falling edge of SCL.

2. The maximum f_HD;DAThas only to be met if the device does not stretch the LOW period t_LOWof the SCL signal.

3. A fast-mode I²C-bus device can be used in a standard-mode I²C-bus system, but the requirement t_SU;DAT≥250 ns

must then be met. This will automatically be the case if the device does not stretch the LOW period of the SCL signal.

If such a device does stretch the LOW period of the SCL signal, it must output the next data bit to the SDA line

t

_rmax+ t_SU;DAT= 1000 + 250 = 1250 ns (according to the standard-mode I²C-bus specification) before the SCL line

is released.

4. C_b= total capacitance of one bus line in pF.

2000 Feb 23

74

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

22 QUALITY AND RELIABILITY

This device will meet Philips Semiconductors General Quality Specification for Business group “Consumer Integrated

Circuits SNW-FQ-611-Part E”. The principal requirements are shown in Tables 30 to 33.

Table 30 Acceptance tests per lot

TEST

REQUIREMENTS

Mechanical

Electrical

cumulative target: <80 ppm

cumulative target: <100 ppm

Table 31 Processability tests (by package family)

TEST

Solderability

0/16 on all lots

0/15 on all lots

Mechanical

Solder heat resistance

Table 32 Reliability tests (by process family)

TEST

CONDITIONS

168 hours at T_j= 150 °C

REQUIREMENTS

<1000 FPM at T_j= 150 °C

Operational life

Humidity life

temperature, humidity, bias 1000 hours, <2000 FPM

85 °C, 85% RH (or equivalent test)

Temperature cycling

performance

T_stg(min)to T_stg(max)

<2000 FPM

Table 33 Reliability tests (by device type)

TEST

CONDITIONS

ESD Human body model 100 pF, 1.5 kW 2000 V

REQUIREMENTS

ESD and latch-up

ESD Machine model 200 pF, 0 W

latch-up

200 V

100 mA, 1.5 × V_DD(absolute maximum)

Notes to Tables 30 to 33

1. ppm = fraction of defective devices, in parts per million.

2. FPM = fraction of devices failing at test condition, in Failures Per Million.

3. FITS = Failures In Time Standard.

2000 Feb 23

75

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

24 ELECTROMAGNETIC COMPATIBILITY (EMC)

GUIDELINES

Using a device socket will unfortunately add to the area

and inductance of the external bypass loop.

Optimization of circuit return paths and minimisation of

common mode emission will be assisted by using a double

sided printed-circuit board (PCB) with low inductance

ground plane.

A ferrite bead or inductor with resistive characteristics at

high frequencies may be utilised in the supply line close to

the decoupling capacitor to provide a high impedance.

To prevent pollution by conduction onto the signal lines

(which may then radiate) signals connected to the

On a single-sided PCB a local ground plane under the

whole Integrated Circuit (IC) should be present as shown

in Fig.32. This should be connected by the widest possible

connection back to the PCB ground connection, and bulk

electrolytic decoupling capacitor. It should preferably not

connect to other grounds on the way, and no wire links

should be present in this connect. The use of wire links

increases ground bounce by introducing inductance into

the ground.

V

_DDsupply via a pull up resistor should not be connected

to the IC side of this ferrite component.

OSCGND should be connected only to the crystal load

capacitors and not the local or circuit ground.

Physical connection distances to associated active

devices should be short.

Output traces should be routed with close proximity to

mutually coupled ground return paths.

The supply pins can be decoupled at the pin to the ground

plane under the IC. This is easily accomplished using

surface mount capacitors, which are more effective than

leaded components at high frequency.

GND +3.3 V

handbook, full pagewidth

electrolytic decoupling capacitor (2 µF)

ferrite beads

other

GND

connections

SM decoupling capacitors (10 to 100 nF)

under-IC GND plane

GND connection

note: no wire links

IC

V

SSA

SSC

MBK979

Fig.32 Power supply connections for EMC.

77

2000 Feb 23

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

25 PACKAGE OUTLINES

SDIP52: plastic shrink dual in-line package; 52 leads (600 mil)

SOT247-1

D

M

E

A

2

A

L

A

1

c

e

(e )

1

w M

Z

b

1

M

H

b

52

27

pin 1 index

E

1

26

0

5

10 mm

scale

DIMENSIONS (mm are the original dimensions)

(1)

A

max.

A

2

max.

(1)

Z

1

w

UNIT

b

c

D

E

e

L

M

H

1

E

min.

max.

1.3

0.8

0.53

0.40

0.32

0.23

47.9

47.1

14.0

13.7

3.2

2.8

15.80

15.24

17.15

15.90

mm

5.08

0.51

4.0

1.778

15.24

0.18

1.73

Note

1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.

REFERENCES

OUTLINE

EUROPEAN

PROJECTION

ISSUE DATE

VERSION

IEC

JEDEC

EIAJ

95-03-11

99-12-27

SOT247-1

MS-020

2000 Feb 23

78

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

LQFP100: plastic low profile quad flat package; 100 leads; body 14 x 14 x 1.4 mm

SOT407-1

y

X

A

51

75

50

26

(1)

76

Z

E

e

H

A

E

2

E

A

(A )

3

A

1

w M

p

θ

b

L

p

L

pin 1 index

detail X

100

1

25

Z

D

v

M

A

B

e

w M

b

p

D

B

H

v

M

5

D

0

10 mm

scale

DIMENSIONS (mm are the original dimensions)

A

(1)

UNIT

A

b

c

D

E

e

H

D

H

L

v

w

y

Z

θ

1

2

3

p

E

p

D

E

max.

7^o

0^o

0.15 1.45

0.05 1.35

0.27 0.20 14.1 14.1

0.17 0.09 13.9 13.9

16.25 16.25

15.75 15.75

0.75

0.45

1.15 1.15

0.85 0.85

mm

1.6

0.25

0.5

1.0

0.2 0.08 0.08

Note

1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.

REFERENCES

OUTLINE

EUROPEAN

PROJECTION

ISSUE DATE

VERSION

IEC

JEDEC

EIAJ

00-01-19

00-02-01

SOT407-1

136E20

MS-026

2000 Feb 23

79

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

26 SOLDERING

The total contact time of successive solder waves must not

exceed 5 seconds.

26.1 Introduction to soldering through-hole mount

packages

The device may be mounted up to the seating plane, but

the temperature of the plastic body must not exceed the

specified maximum storage temperature (T_stg(max)). If the

printed-circuit board has been pre-heated, forced cooling

may be necessary immediately after soldering to keep the

temperature within the permissible limit.

This text gives a brief insight to wave, dip and manual

soldering. A more in-depth account of soldering ICs can be

found in our “Data Handbook IC26; Integrated Circuit

Packages” (document order number 9398 652 90011).

Wave soldering is the preferred method for mounting of

through-hole mount IC packages on a printed-circuit

board.

26.3 Manual soldering

Apply the soldering iron (24 V or less) to the lead(s) of the

package, either below the seating plane or not more than

2 mm above it. If the temperature of the soldering iron bit

is less than 300 °C it may remain in contact for up to

10 seconds. If the bit temperature is between

26.2 Soldering by dipping or by solder wave

The maximum permissible temperature of the solder is

260 °C; solder at this temperature must not be in contact

with the joints for more than 5 seconds.

300 and 400 °C, contact may be up to 5 seconds.

26.4 Suitability of through-hole mount IC packages for dipping and wave soldering methods

SOLDERING METHOD

PACKAGE

DIPPING

WAVE

DBS, DIP, HDIP, SDIP, SIL

suitable

suitable⁽¹⁾

Note

1. For SDIP packages, the longitudinal axis must be parallel to the transport direction of the printed-circuit board.

2000 Feb 23

80

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

27 DEFINITIONS

Data sheet status

Objective speciﬁcation

Preliminary speciﬁcation

Product speciﬁcation

This data sheet contains target or goal speciﬁcations for product development.

This data sheet contains preliminary data; supplementary data may be published later.

This data sheet contains ﬁnal product speciﬁcations.

Limiting values

Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or

more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation

of the device at these or at any other conditions above those given in the Characteristics sections of the speciﬁcation

is not implied. Exposure to limiting values for extended periods may affect device reliability.

Application information

Where application information is given, it is advisory and does not form part of the speciﬁcation.

28 LIFE SUPPORT APPLICATIONS

These products are not designed for use in life support appliances, devices, or systems where malfunction of these

products can reasonably be expected to result in personal injury. Philips customers using or selling these products for

use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such

improper use or sale.

29 PURCHASE OF PHILIPS I²C COMPONENTS

Purchase of Philips I²C components conveys a license under the Philips’ I²C patent to use the

components in the I²C system provided the system conforms to the I²C specification defined by

Philips. This specification can be ordered using the code 9398 393 40011.

2000 Feb 23

81

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

NOTES

2000 Feb 23

82

Philips Semiconductors

Preliminary speciﬁcation

TV microcontrollers with Closed Captioning (CC)

and On-Screen Display (OSD)

SAA55xx

NOTES

2000 Feb 23

83

Philips Semiconductors – a worldwide company

Argentina: see South America

Netherlands: Postbus 90050, 5600 PB EINDHOVEN, Bldg. VB,

Tel. +31 40 27 82785, Fax. +31 40 27 88399

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New Zealand: 2 Wagener Place, C.P.O. Box 1041, AUCKLAND,

Tel. +64 9 849 4160, Fax. +64 9 849 7811

Austria: Computerstr. 6, A-1101 WIEN, P.O. Box 213,

Tel. +43 1 60 101 1248, Fax. +43 1 60 101 1210

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Belarus: Hotel Minsk Business Center, Bld. 3, r. 1211, Volodarski Str. 6,

220050 MINSK, Tel. +375 172 20 0733, Fax. +375 172 20 0773

Pakistan: see Singapore

Belgium: see The Netherlands

Brazil: see South America

Philippines: Philips Semiconductors Philippines Inc.,

106 Valero St. Salcedo Village, P.O. Box 2108 MCC, MAKATI,

Metro MANILA, Tel. +63 2 816 6380, Fax. +63 2 817 3474

Bulgaria: Philips Bulgaria Ltd., Energoproject, 15th floor,

51 James Bourchier Blvd., 1407 SOFIA,

Tel. +359 2 68 9211, Fax. +359 2 68 9102

Poland: Al.Jerozolimskie 195 B, 02-222 WARSAW,

Tel. +48 22 5710 000, Fax. +48 22 5710 001

Portugal: see Spain

Romania: see Italy

Canada: PHILIPS SEMICONDUCTORS/COMPONENTS,

Tel. +1 800 234 7381, Fax. +1 800 943 0087

China/Hong Kong: 501 Hong Kong Industrial Technology Centre,

72 Tat Chee Avenue, Kowloon Tong, HONG KONG,

Tel. +852 2319 7888, Fax. +852 2319 7700

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Tel. +7 095 755 6918, Fax. +7 095 755 6919

Singapore: Lorong 1, Toa Payoh, SINGAPORE 319762,

Colombia: see South America

Czech Republic: see Austria

Tel. +65 350 2538, Fax. +65 251 6500

Slovakia: see Austria

Slovenia: see Italy

Denmark: Sydhavnsgade 23, 1780 COPENHAGEN V,

Tel. +45 33 29 3333, Fax. +45 33 29 3905

South Africa: S.A. PHILIPS Pty Ltd., 195-215 Main Road Martindale,

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Tel. +27 11 471 5401, Fax. +27 11 471 5398

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Sweden: Kottbygatan 7, Akalla, S-16485 STOCKHOLM,

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Gedung Philips, Jl. Buncit Raya Kav.99-100, JAKARTA 12510,

Tel. +62 21 794 0040 ext. 2501, Fax. +62 21 794 0080

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TAIPEI, Taiwan Tel. +886 2 2134 2886, Fax. +886 2 2134 2874

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TOKYO 108-8507, Tel. +81 3 3740 5130, Fax. +81 3 3740 5057

United Kingdom: Philips Semiconductors Ltd., 276 Bath Road, Hayes,

MIDDLESEX UB3 5BX, Tel. +44 208 730 5000, Fax. +44 208 754 8421

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Uruguay: see South America

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Tel. +9-5 800 234 7381, Fax +9-5 800 943 0087

Yugoslavia: PHILIPS, Trg N. Pasica 5/v, 11000 BEOGRAD,

Middle East: see Italy

Tel. +381 11 3341 299, Fax.+381 11 3342 553

For all other countries apply to: Philips Semiconductors,

Internet: http://www.semiconductors.philips.com

International Marketing & Sales Communications, Building BE-p, P.O. Box 218,

5600 MD EINDHOVEN, The Netherlands, Fax. +31 40 27 24825

69

SCA

All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner.

The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed

without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license

under patent- or other industrial or intellectual property rights.

Printed in The Netherlands

753504/02/pp84

Date of release: 2000 Feb 23

Document order number: 9397 750 06788


型号：	SAA5542PS/NNNN
厂家：	NXP
描述：	TV microcontrollers with Closed Captioning (CC) and On-Screen Display (OSD) 电视微控制器，具有隐藏式字幕（ CC）和屏幕显示（ OSD ）微控制器电视光电二极管
文件：	总84页 (文件大小：339K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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