Read Sharp ER-A310 (serv.man2) Service Manual online
2. CPU (UPD78045F) pin configuration
No.
PIN NAME
ER-A310
ER-A330
I/O
ACTIVE
SIGNAL NAME
DESCRIPTION
SIGNAL NAME
DESCRIPTION
1
P94
DIG7
Display digit 7
DIG7
Display digit 7
O
H
2
P93
DIG6
Display digit 6
DIG6
Display digit 6
O
H
3
P92
DIG5
Display digit 5
DIG5
Display digit 5
O
H
4
P91
DIG4
Display digit 4
DIG4
Display digit 4
O
H
5
P90
DIG3
Display digit 3
DIG3
Display digit 3
O
H
6
P81
DIG2
Display digit 2
DIG2
Display digit 2
O
H
7
P80
DIG1
Display digit 1
DIG1
Display digit 1
O
H
8
VDD
VDD
+5V
VDD
+5V
9
P27
AD7
RAM Address & Data bus 7
AD7
RAM Address & Data bus 7
I/O
H
Printer magnet 8
10
P26
AD6
RAM Address & Data bus 6
AD6
RAM Address & Data bus 6
I/O
H
Printer magnet 7
11
P25
AD5
RAM Address & Data bus 5
AD5
RAM Address & Data bus 5
I/O
H
Journal print magnet 6
Printer magnet 6
Receipt print magnet 6
12
P24
AD4
RAM Address & Data bus 4
AD4
RAM Address & Data bus 4
I/O
H
Journal print magnet 5
Printer magnet 5
Receipt print magnet 5
13
P23
AD3
RAM Address & Data bus 3
AD3
RAM Address & Data bus 3
I/O
H
Journal print magnet 4
Printer magnet 4
Receipt print magnet 4
14
P22
AD2
RAM Address & Data bus 2
AD2
RAM Address & Data bus 2
I/O
H
Journal print magnet 3
Printer magnet 3
Receipt print magnet 3
15
P21
AD1
RAM Address & Data bus 1
AD1
RAM Address & Data bus 1
I/O
H
Journal print magnet 2
Printer magnet 2
Receipt print magnet 2
16
P20
AD0
RAM Address & Data bus 0
AD0
RAM Address & Data bus 0
I/O
H
Journal print magnet 1
Printer magnet 1
Receipt print magnet 1
17
/RESET
/RESET
Reset signal
/RESET
Reset signal
I
L
18
P74
SCOM
Printer step motor common signal
NU
NU
O
H
19
P73
SM4
Printer step motor drive signal 4
NU
NU
O
H
20
AVSS
AVSS
GND
AVSS
GND
21
P17
KR11
Key return signal 11
KR11
Key return signal 11
I
H
22
P16
KR10
Key return signal 10
KR10
Key return signal 10
I
H
23
P15
KR9
Key return signal 9
KR9
Key return signal 9
I
H
24
P14
KR8
Key return signal 8
KR8
Key return signal 8
I
H
25
P13
KR7
Key return signal 7
KR7
Key return signal 7
I
H
26
P12
KR6
Key return signal 6
KR6
Key return signal 6
I
H
27
P11
KR5
Key return signal 5
KR5
Key return signal 5
I
H
28
P10
P10
Dry battery voltage
P10
Dry battery voltage
I
29
AVDD
AVDD
+5V
AVDD
+5V
30
AVREF
AVREF
+5V (VCC)
AVREF
+5V (VCC)
31
XT1
XT1
Sub clock: 32.768 kHz
P04
Sub clock: 32.768 kHz
I
32
XT2
XT2
XT2
O
33
VSS
VSS
GND
VSS
GND
34
X1
X1
Main clock: 4.19 MHz
X1
Main clock: 4.19 MHz
I
35
X2
X2
X2
O
36
P37
MD
Printer motor ON signal
MD
Printer motor ON signal
O
H
37
P36
BUZ
Buzzer ON signal
BUZ
Buzzer ON signal
O
H/L
38
P35
RF
Receipt paper feed signal
RF
Receipt paper feed signal
O
H
39
P34
JF
Journal paper feed signal
JF
Journal paper feed signal
O
H
40
P33
STAMP
Stamp ON signal
STAMP
Stamp ON signal
O
H
41
P32
/ALE
Address latch signal
/ALE
Address latch signal
O
↓
42
P31
/CE
Chip select signal
/CE
Chip select signal
O
L
– 9 –
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