Cpu; Port List - Acroprint ES700 Service Manual

7-3. CPU

• 4-bit single-chip microcomputer µPD753108GC(NEC product)
• Equipped with 8,192 x 8 bit ROM and 512 x 4bit RAM
• Main system clock is a 4.19 MHz ceramic oscillator.
Subsystem clock is a 32.768 kHz crystal oscillator.
Equipped with LCD controller/driver.

7-4. Port List

Name No. of Pins
P00/INT4
P01/SCK
P02/SO/SB0
P03/SI/SB1
P10/INT0
P11/INT1
P12/INT2/TI1/TI2
P13/TI0
P20/PT00
P21/PT01
P22/PCL/PT02
P23/BUZ
P30/LCDCL
P31/SYNC
P32
P33
P50
P51
P52
P53
P60/KR0
P61/KR1
P62/KR2
P63/KR3
S23/P80
S22/P81
S21/P82
S20/P83
S19/P90
S18/P91
S17/P92
S16/P93
I/O
25 I
26 I
27 I
28 I
29 I
30 I
31 I
32 I
33 O
34 O
35 O
36 O
5 O
6 O
7 O
8 O
10 O
11 O
12 O
13 O
14 I
15 I
16 I
17 I
37 O
38 O
39 O
40 O
41 O
42 O
43 O
44 O
PWF Power failure detection
PS Paper Sensor
PB Key Top
- Unused
ENC
CR encoder
- Unused
SH Home position sensor
- Unused
PIN9 Pin9
- Unused
- Unused
BUZ Clock trimming
CR0 CR motor control 0
CR1 CR motor control 1
- Unused
- Unused
- Unused
- Unused
- Unused
ESN Sensor enable
SEL SELECT switch
CHG CHANGE switch
SET SET switch
- Unused
PIN8 Pin8
PIN7 Pin7
PIN6 Pin6
PIN5 Pin5
PIN4 Pin4
PIN3
Pin3
PIN2 Pin2
PIN1 Pin1
7-3
Function