– 9 –
Fig. 4-1 Internal Bus Communication System
Table 4-2. Key Operation
2. Internal Communication Bus
The SY-A block carries out overall control of camera operation by detecting the input from the keyboard and the condition of the
camera circuits. The 8-bit microprocessor reads the signals from each sensor element as input data and outputs this data to the
camera circuits (ASIC) or to the LCD display device as operation mode setting data. Fig. 4-1 shows the internal communication
between the 8-bit microprocessor, ASIC and SPARC lite circuits.
3. Key Operaiton
For details of the key operation, refer to the instruction manual.
8-bit
Microprocessor
ASIC
REQACK
EXT_IRQ1
SDATA
SDIR
SCK
RESET B
0
1
2
0
1
2
3
SCAN
OUT
SCAN
IN
MAIN SW-PLAY POSITION
MAIN SW-LCD OFF
POSITION
RIGHT
MAIN SW-LCD ON
POSITION
LEFT
COVER SW
UP
DOWN
3
-
SET
MODE
FOCUS SW
CF_IN
SHUTTER 1st
SHUTTER 2nd
TEST
