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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.
Fig. 3-3
A0
A1
A2
Vss
Vcc + 5V
NC
SCL
SDA
I
2
C-BUS line
Device adress
GND
EEPROM(QA02)
1
2
3
4
8
7
6
5
Fig. 3-4
6. ON SCREEN FUNCTION
The OSD system of TW40F80 employs the external OSD
IC (QR60, MB90091) to obtain high quality OSD.
54
56
58
55
16
64
59
60
61
22
23
24
25
26
R OUT
G OUT
B OUT
SCLK
SCS
TRE
SIN
RESET
VOB2
VIDEO
(YM)
CLK
CS
BUSY
DATA
OSD RESET
QR60 MB90091QA01 Microprocessor
QR60 is controlled by the microprocessor QA01 with the
exclusive control signals of CLK, DATA, CS, BUSY, RE-
SET.
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 I
2
C bus. The power
supply of EEPROM and MICOM is common. Pin function
of EEPROM is shown in Fig. 3-3.