5. EEPROM (QA02)

EEPROM (Non volatile memory) has function which, in spite of power-off, memorizes the such condition as channel se- lecting data, last memory status, user control and digital pro- cessor data. The capacity of EEPROM is 8k bits.

Type name is 24LC08BI/P or ST24C08CB6, and those are the same in pin allocation and function, and are exchange- able each other. This IC controls through I2C bus. The power supply of EEPROM and MICOM is common. Pin function of EEPROM is shown in Fig. 3-3.

 

 

 

EEPROM(QA02)

 

 

A0

1

8

Vcc + 5V

Device adress

A1

2

7

NC

GND

 

 

 

 

 

A2

3

6

SCL

I2C-BUS line

Vss 4

5 SDA

Fig. 3-3

6. ON SCREEN FUNCTION

The OSD system of TW40F80 employs the external OSD

IC (QR60, MB90091) to obtain high quality OSD.

QR60 is controlled by the microprocessor QA01 with the exclusive control signals of CLK, DATA, CS, BUSY, RE- SET.

QA01 Microprocessor

 

 

 

QR60 MB90091

 

CLK

22

54

SCLK

R OUT

59

CS

23

56

SCS

G OUT

60

BUSY

24

58

TRE

B OUT

61

DATA

25

55

SIN

 

 

OSD RESET

26

16

RESET

 

 

 

VIDEO

64

VOB2

 

 

 

(YM)

 

 

 

 

Fig. 3-4

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Toshiba TW40F80 manual On Screen Function, EEPROMQA02, Sda