Toshiba CF35E50, Technical Training Manual

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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 selecting
data, last memory status, user control and digital processor data. The capacity of EEPROM is 8k bits. Type name is 24LC04BI/
P or ST24C04CB6, and those are the same in pin allocation and function, and are exchangeable each other. This IC controls
through I2C bus. The power supply of EEPROM and MICOM is common. Pin function of EEPROM is shown in Figure 3-3.
Fig. 3-3
6. ON SCREEN FUNCTION
ON SCREEN FUNCTION indicates data like channel, volume. Formerly, exclusive use of OSD IC was used, but in N5SS,
OSD function is involved in microcomputer. Pin function concerning on-screen is shown in figure 3-4. Oscillation clock of OSD
is approx. 4.5MHz. 9MHz which becomes twice in microcomputer is dot clock. For oscillation coil, TRF1160D (LA02) is used.
Fig. 3-4
1
2
3
4
8
7
6
5
A0
A1
A2
Vss
Vcc + 5V
NC
SCL
SDA
I 2 C-BUS line
Device adress
GND
EEPROM(QA02)
OSC2
OSC1
VD
HD
Y/BL
B
G
R
QA01
O
I
I
I
O
O
O
O
29
28
27
26
25
24
23
22
OSC2 OSC OUT
OSC1 OSC IN
VSYNC H. SYNC SIGNAL
HSYNC V. SYNC SIGNAL
Ys/Ym HALF TONE SIGNAL
BOUT
GOUT COLOR SIGNAL
ROUT
V
G