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Pin No. Port Signal name IN/OUT H/L Specifications
52 P27 A15 Address signal
53 P50 A16 Address signal
54 P51 LHPS IN L Lens home position signal (LOW at 100%)
55 P52 PPD IN H Transport pass sensor signal (HIGH when paper is sensed.)
56 P53 MCS IN H Drum marking sensor signal
57 VSS VSS Power (GND)
58 P60 DATA0 IN Matrix input 0 (LSI51)
59 P61 DATA1 IN Matrix input 1 (LSI51)
60 P62 DATA2 IN Matrix input 2 (LSI51)
61 S-CLK S-CLK OUT H System clock (Fixed to HIGH)
62 /STBY /STBY IN H Standby signal (Fixed to HIGH)
63 /RES /RESET IN L Reset at LOW.
64 NMI NMI Non-maskable interruption (Fixed to LOW.)
65 VSS VSS Power (GND)
66 EXTAL EXTAL IN Clock (8MHz)
67 XTEL XTEL IN Clock (8MHz)
68 VCC VCC Power (+5V2)
69 P63 /AS OUT H Address strobe signal (Fixed to HIGH.)
70 P64 /RD OUT L ROM. I/O data read signal
71 P65 /HWR OUT L I/O data write signal
72 P66 /LWR OUT H Lower write signal (Fixed to HIGH.)
73 MD0 MD0 IN H Mode set signal (Fixed to HIGH.)
74 MD1 MD1 IN L Mode set signal (Fixed to LOW.)
75 MD2 MD2 IN H Mode set signal (Fixed to HIGH.)
76 AVCC AVCC A/D, D/A convertor power
77 VREF VREF A/D, D/A convertor reference voltage
78 P70 AES IN AE sensor signal (Analog input signal)
79 P71 TH IN Thermistor signal (Analog input signal)
80 P72 TCS IN Toner density sensor signal (Analog input signal)
81 P73 PROCON IN Process control signal (Analog input signal)
82 P74 DVC IN Developing unit color detection signal (Analog input signal)
83 P75 PD IN Original sensor signal (Analog input signal)
84 P76 BLDATA OUT Blank lamp data signal (Analog input signal)
85 P77 PCG OUT Process control gain signal
86 AVSS GND
87 P80 MHPS IN H Mirror home position sensor signal
88 P81 FWS IN Zero cross detection signal
89 P82 /CS2 OUT L Chip select signal (I/O) (I/O is selected at LOW.)
90 P83 /CS1 OUT L Chip select signal (EPROM) (EPROM is selected at LOW.)
91 P84 TFD IN H Waste toner sensor signal (Toner full at HIGH)
92 VSS GND Power (GND)
93 PA0 LED0 OUT H Original detection LED lighting signal 0 (ON at HIGH)
94 PA1 LED1 OUT Original detection LED lighting signal 1 (ON at HIGH)
95 PA2 CLPWM OUT Copy lamp control signal (PWM signal)
96 PA3 MMRE IN Main motor rotary encoder detection signal
97 PA4 GBPWM OUT Grid bias control signal (PWM signal)
98 PA5 PFMCLK OUT Paper feed motor clock signal
99 PA6 TM0 OUT H Toner supply motor drive signal 0 (ON at HIGH)
100 PA7 TM1 OUT H Toner supply motor drive signal 1 (ON at HIGH)
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