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3. Key Operaiton
For details of the key operation, refer to the instruction manual.
SCAN
IN
0
SCAN
OUT
0
UP
1
-
PW_TEST
2
3
-
4. Power Supply Control
The 8-bit microprocessor controls the power supply for the overall system.
The following is a description of how the power supply is turned on and off. When the battery is attached, a regulated 3.2 V (power
off: 2.4 V) voltage is normally input to the 8-bit microprocessor (IC301) by IC302, so that clock counting and key scanning is
carried out even when the power switch is turned off, so that the camera can start up again. When the battery is removed, the 8-
bit microprocessor operates in sleep mode using the backup battery. At this time, the 8-bit microprocessor only carries out clock
counting, and waits in standby for the battery to be attached again. When a switch is operated, the 8-bit microprocessor supplies
power to the system as required.
The 8-bit microprocessor first sets the P ON2 signal at pin (15) and P ON signal at pin (42) to high, and then turns on the DC/DC
converter. After this, low signal is output from pin (18) so that the ASIC is set to the reset condition. After this these pins set to
high, and set to active condition. Once it is completed, the ASIC returns to the reset condition, all DC/DC converters are turned
off and the power supply to the whole system is halted.
Power switch ON - Auto power OFF
CAMERA
Note) 4 MHz = Main clock operation, 32 kHz = Sub clock operation
1
RIGHT
V. REC
-
-
Table 5-2. Key Operation
Power voltage
Power OFF
LCD finder
Play back
Table 5-3. Camera Mode
2
3
DOWN
LEFT
TELE
WIDE
TEST
-
LCD TURN
-
ASIC,
memory
3.3 V 1.2 V
OFF
OFF
ON
ON
– 11 –
4
SET
-
PW_ON
-
CCD
8 bit CPU
3.2 V (P ON)
+3.4 V (A)
2.4 V (P OFF)
+12 V (A), -6 V(A)
OFF
32KHz
OFF
32KHz
ON
4 MHz
OFF
4 MHz
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