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3. Key Operaiton
For details of the key operation, refer to the instruction manual.
SCAN
SCAN
0
IN
OUT
← LEFT
0
1
TELE
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
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 micro-
processor operates in sleep mode using the backup lithum 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 ON signal at pin (40) to high, and then turns on the DC/DC converter. After this, low
signals are output from pin (17) so that the ASIC is set to the reset condition. After this these pins set to high, and set to active
condition. If the LCD monitor is on, the LCD ON 1 signal at pin (22) set to high, and the DC/DC converter for the LCD monitor is
turned on. 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 voltage
Power OFF
Power switch ON-
CAMERA
Play back
Note) 4 MHz = Main clock operation, 32 kHz = Sub clock operation
1
→ RIGHT
WIDE
-
TEST
Table 5-2. Key Operation
Auto power OFF
LCD finder
Table 5-3. Camera Mode
2
3
↑ UP
↓ DOWN
REC
1st SHUTTER
2nd SHUTTER
-
-
-
-
ASIC,
CCD
memory
5 V (A)
3.3 V 1.2 V
+12 V etc.
OFF
OFF
OFF
OFF
ON
ON
ON
OFF
– 10 –
4
5
MENU
SET
LCD LOTATION
CAMERA
-
-
POWER ON
-
-
PANEL OPEN
8 bit
CPU
MONITOR
3.2 V
(ALWAYS)
+12 V etc.
32KHz
32KHz
4 MHz
4 MHz
6
PLAY
LCD
3.3 V (L)
OFF
OFF
ON
ON
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