– 10 –Table 5-1. 8-bit Microprocessor Port Specification43 TXD6 O Program writing reception data (UART)44 NOT USED - -42 RXD6 I Program writing reception data (UART)Fig. 5-1 Internal Bus Communication System2. Internal Communication BusThe SYA block carries out overall control of camera operation by detecting the input from the keyboard and the condition of thecamera circuits. The 8-bit microprocessor reads the signals from each sensor element as input data and outputs this data to thecamera circuits (ASIC) or to the LCD display device as operation mode setting data. Fig. 5-1 shows the internal communicationbetween the 8-bit microprocessor and ASIC.8-bit micro processor ASICMRSTPLLENSISOSCKSREQcommuni-cationCOMREQsetting ofexternal port45 NOT USED - -46 NOT USED - -47 AVREF I Internal A/D standard potential48 AVSS - Analog GND (A/D GND)49 BATTERY I Battery potential detection (A/D)50 ILLUMI I Illuminance sensor potential detection (A/D)51 TOUCH_IN I Touch sensor input (A/D)52 CARD I SD card insertion detection53 AV JACK I AV cable insertion detection (L= detection)54 ZCHG_DONE I Strobo full charge detection signal55 NOT USED I Always input mode56 NOT USED O Always low output57 ST_CHG_ON O Strobo condensor charge start58 SCK O Communication CLK to ASIC59 SI I Reception data from ASIC60 SO O Sending data to ASIC61 BACKUPCTRL O Charge control to coin battery (L= charge)62 FLMD0_SY O -63 CAM_PWR I -64 1st I Shutter 1st detection