Sanyo VPC-J4 Service Manual

Contents

– 6 –1-5. SYA CIRCUIT DESCRIPTION1. Configuration and FunctionsFor the overall configuration of the SYA block, refer to the block diagram. The SYA block centers around a 8-bit microprocessor(IC301), and controls camera system condition (mode).The 8-bit microprocessor handles the following functions.1. Operation key input, 2. Clock control and backup, 3. Power ON/OFF, 4. Storobe charge control, 5. Signal input and output forzoom and lens control.See next pagePin Signal1234567891112131415161718192024262728293031323334353637394142~443840AVREFAVSSICVDDREGCVSSXINXOUTRESETXCOUTCLKSEL0BAT_OFFNCUSB_DETBR_OPENSREQBACKUP_CTLLCD ON3FLMD1NCPRG SIPRG SCKMAIN RESETNCVF. LED (R)VF. LED (G)VSSVDDP ONPA ONSCKSISOCHG ONFLMD0NCSCAN OUT 2~0I/OI-----I-I-OIOIIIOOOOIOOOOO--OOOIOOOOOOutlineAnalog standard voltage input terminalGNDPower for program writingVDDRegulator output stability capacity connectionGNDMain clock oscillation terminal (4MHz)Main clock oscillation terminalReset inputClock oscillation terminalARM system clock ON/OFFBattery off detection signal input(Output mode “0” fixing)USB power detection terminal ( ↓ detection)Manual barrrier detection ( ↓ detection)Communication transmission clock (SY-ASIC)Backup battery charge control (L= charge)D/D converter (LCD system) ON/OFF signal 3(Output mode “0” fixing)Serial data input for flashSerial clock output for flashSystem reset (MRST)(Output mode “0” fixing)VF LED (red) (L= lighting)VF LED (green) (L= lighting)GNDVDDD/D converter (digital system) ON/OFF signalD/D converter (analog system) ON/OFF signalSerial clock outputSerial data inputSerial data outputStrobe charge controlFlash writing contol 0(Output mode “0” fixing)Key matrix outputFlash writing control 110 XCIN I Clock oscillation terminal (32.768 kHz)21 LCD ON2 O D/D converter (LCD system) ON/OFF signal 222 LCD ON O D/D converter (LCD system) ON/OFF signal 123 BLON O LCD backlight ON signal (H= lighting)25 PRG SO O Serial data output for flash