2. NAIN PWB CPU (IC203) SIGNAL NAME
PIN No.
Port
Signal name
IN/OUT
Active level
Specifications
1
P50/TXD
SDA (EEPROM)
OUT/IN
—
EEPROM data signal line
2
P51/RXD
NC
OUT
—
3
P52/SCK
SCL (EEPROM)
OUT
—
EEPROM clock signal line
4
/RES
RESET
IN
L
Reset state at LOW (OV).
5
/NMI
/NM1
/IN
L
Driven LOW when the CPU is hung up,and interruption occurs.
6
VCC
VD
IN
—
Power (5V)
7
/STBY
VD
IN
H
Hardware standby mode signal (not used).
8
VSS
GND
IN
—
Power (GND)
9
XTAL
XTAL
IN
—
Clock (10MHz)
10
EXTAL
XTAL
IN
—
Clock (10MHz)
11
MD1
VD
IN
H
Operation mode, control signal
12
MD0
VD
IN
H
Operation mode, control signal
13
AVSS
GND
IN
—
Power (GND)
14
P70/AN0
HLTH
IN
—
Analog signal (thermistor)
15
P71/AN1
AESP
IN
—
Analog signal (AE sensor)
16
P72/AN2
VRV
IN
—
Analog signal (Volume voltage simulation)
17
P73/AN3
GND
IN
—
Analog signal (not used)
18
P74/AN4
GND
IN
—
Analog signal (not used)
19
P75/AN5
GND
IN
—
Analog signal (not used)
20
P76/AN6
GND
IN
—
Analog signal (not used)
21
P77/AN7
GND
IN
—
Analog signal (not used)
22
AVCC
VD
IN
—
A/D convertor power pin (5V)
23
P60/FTCI/TMCIO
HL
OUT
H
Heater lamp control signal
24
P61/FT0A
CSEG 0
OUT
H
Display (common 0) control signal
25
P62/FTIA
MREP
IN
Falling edge Motor encoder signal
26
P63/FTIB/TMRIO
CSEG 1
OUT
H
Display (common 1) control signal
27
P64/FTIC/TM00
MMCLK
OUT
H
Motor control signal (PWM)
28
P65/FTID/WDCLK
WDCLK
OUT
—
Watch dog timer pulse signal
29
P66/FTOB/TMRI1
NC
OUT
—
30
P67/TM01
CLCLK
OUT
H
Copy lamp control signal (PWM)
31
VCC
VD
IN
—
Power (5V)
32
P27/A15
RRS B
OUT
H
Paper start solenoid control signal
33
P26/A14
RRS A
OUT
H
Paper start solenoid control signal
34
P25/A13
PR
OUT
H
Power relay control signal
35
P24/A12
THS
OUT
H
Toner supply solenoid control signal
36
P23/A11
PFS
OUT
H
Paper feed solenoid control signal
37
P22/A10
/MHV
OUT
L
High voltage control signal
38
P21/A9
GBC
OUT
H
Grid control signal
39
P20/A8
DVB
OUT
H
Developing bias control signal
40
VSS
GND
IN
—
Power (GND)
41
P17/A7
NC
OUT
—
42
P16/A6
DSEG6 (DISPLAY)
OUT
H
Display (segnent 6) control signal
43
P15/A5
DSEG5 (DISPLAY)
OUT
H
Display (segnent 5) control signal
44
P14/A4
DSEG4 (DISPLAY)
OUT
H
Display (segnent 4) control signal
45
P13/A3
DSEG3 (DISPLAY)
OUT
H
Display (segnent 3) control signal
46
P12/A2
DSEG2 (DISPLAY)
OUT
H
Display (segnent 2) control signal
47
P11/A1
DSEG1 (DISPLAY)
OUT
H
Display (segnent 1) control signal
48
P10/A0
DSEG0 (DISPLAY)
OUT
H
Display (segnent 0) control signal
49
P30/D0
PID (PAPER IN)
IN
L
Paper entry detection (L: paper presence)
50
P31/D1
POD (PAPER OUT)
IN
L
Paper exit detection (L: paper presence)
51
P32/D2
TCSP (TONER CONTROL)
IN
L
Toner density detection (L: under toner)
52
P33/D3
TCSP (TABLE POSITION)
IN
—
Tadle position detection (H: feed side)
53
P34/D4
KI (KEY INPUT)
IN
H
Key input signal
54
P35/D5
SMIP0
IN
—
Machine mode select signal (input)
55
P36/D6
SMIP1
IN
—
Machine mode select signal (input)
56
P37/D7
SMIP2
IN
—
Machine mode select signal (input)
57
P40//ADTRG//IRQ2 FW
IN
—
Zero cross signal
58
P41//IRQ1
FW
IN
—
Zero cross signal
59
P42//TRQ0
MREP
IN
—
Motor encoder signal
60
P43//RD
SMOP0
OUT
—
Machine mode strobe signal (Output)
61
P44//WR
SMOP1
OUT
—
Machine mode strobe signal (Output)
62
P45//AS
SMOP2
OUT
—
Machine mode strobe signal (Output)
63
P46/@
MSIM
IN
—
Machine emulation signal (Input)
64
P47//WAIT
NC
OUT
—
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