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System Control Circuit
Panel Operations
Figure 22
2
This main CPU, IC9701 uses three different I
C bus lines to control peripheral
devices. Bus line 1 controls the operation of the EEPROM. Programmable setting
such as drive settings or white balance is stored in the EEPROM, IC9702. Bus
line 2 controls the video processing, main tuner and the sub tuner. Examples of
video processing include on-screen display, tint or contrast as well as many other
picture adjustments. Bus line 3 reads the data from the Stand-by CPU for front
panel and remote control operation. Additionally bus line 3 reads the condition of
the SOS protection lines and transfers this information to the Main CPU.
In all cases, the Main CPU, is the master of the bus, all other devices are slaves.
This means that all commands are generated from the Main CPU.
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