– 11 –
3. Key Operaiton
For details of the key operation, refer to the instruction manual.
Table 5-2. Key Operation
0
1
2
0
1
2
3
SCAN
OUT
SCAN
IN
MENU
TELE
UP
-
OK
DOWN
-
PLAY
WIDE
SCENE
RIGHT
LEFT
ASIC,
memory
CCD
8bit
CPU
LCD
MONITOR
Power supply voltage
Power OFF
Playback mode
Shooting
USB connection
1.26 V, 3.25 V
1.8 V
12 V, -6 V
3.4 V
3.2 V
3.0 V
OFF
OFF
32KHz
OFF
ON
OFF
4MHz
ON
ON
OFF
4MHz
ON
ON
ON
4MHz
ON
ON
OFF
4MHz
OFF
Table 5-3. Power supply control
Shooting mode (LCD)
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, IC501 is operating and
creating 4.2 V, a regulated 3.2 V voltage is normally input to the 8-bit microprocessor (IC301) by IC302, 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 power switch is off, the 8-bit microprocessor halts the high speed built-in oscillation clock (8MHz oscillation, 4MHz
operation), and operates 32.768 kHz of subclock.
When the battery is removed, the 8-bit microprocessor power switches the battery for memory backup by IC302, and operates at
low consumption. At this condition, the 8-bit microprocessor halts the high speed built-in oscillation clock, and operates clock
counting by sub clock.
Also, the battery for backup is charged 16 hours from it to be attached.
When the power switch is on, the 8-bit microprocessor starts processing. The 8-bit microprocessor first sets both the PON signal
at pin (27) to High, and then turn on the power circuit. After PON signal is to High, sets external port of ASIC after approximately
100 ms. According to setting of this external port, carry out setting of the operating frequency, oscillation control and PAON and
PAON3 control (analog system power) from ASIC. Also, it starts communication with ASIC, and confirms the system is operative.
When LCD panel turns on, set BL ON signal at pin (28) to High, and turn on the backlight power.
When the power switch is off, the lens will be stowed, and PON and BL ON signals to Low and the power supply to the whole
system is halted. The 8-bit microprocessor halts the high speed built-in oscillation clock, and set operation mode of clock ocillation.
3
-
PW_TEST
TEST
-
