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1-2-8. Adjustment data and camera setting data
The CCD scratch data and the AF, AE, AWB and other camera adjustment data is written in the FROM (U304). Menu setting data is written in the
sub-CPU (U405). The sub-CPU data is retained as long as the voltage of the secondary coin battery on the Main Board is 1.8V or greater.
1-2-9. SD card data access
The data is transferred from the DSP (U901) in the direct SPI mode.
1-2-10. Flash control
The DSP (U901) detects the STRDY signal from the flash circuit and checks whether charging is completed. If not, the STSTART signals becomes
high (H), and charging continues until the STRDY signal becomes low (L). If charging is not completed after the specified time (about 30 seconds),
it is deemed there is an error and charging is interrupted. Flash charging processing is not conducted if the flash mode is set to no flash.
The flash is emitted when the DSP (U901) switches the STXON signal from L to H. The quantity of light is controlled by the lighting control sensor.
The flash is only emitted when charging has been completed. Capturing of the next image is prohibited until charging is completed.
1-2-11. Power supply control
For the supply of power, the main converter IC (U10) generates voltages of 3.4V for the motors, 1.8V for the DSP, 15V for the CCD, -7V for the
CCD, 12V for the LCD, 8.5V for the EVF, 3.3V for the digital circuitry, and 5V for the CCD and flash. The 3.4V voltage for the motors is used to
drive the motors and as the power source for the EVF backlight IC (U02). For the LCD backlight, a voltage of 21V is supplied by the IC (U03). The
power ON/OFF signals are generated by the sub-CPU (U405).
1-2-12. Program loading sequence
The camera switches to the program load sequence when the MENU or trash key is held in while the camera's power is being turned on with the
power switch from the power off status when a binary file (PDR-M700.BIN) is provided on the SD card.
When the MENU key is held in, the camera begins operating according to the program in the "PDR-M700.BIN" file on the SD card but the
operation for loading in the FlashROM (U304/M28W320ETC70) in the camera is not performed. When the trash key is held in, the program in the
"PDR-M700.BIN" file on the SD card is first loaded in the FlashROM (U304/M28W320ETC70) in the camera.
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