Read Sharp ER-A850 (serv.man5) Service Manual online
2) Pin assignment
Pin
No.
No.
Port
I/O
RESET
State
Signal
name
I/O
Notes
PULL
−
UP
−
DOWN
1
R0
1
I/O
H-Z
SB
O
DB4 : SEG-B
PULL-DOWN
2
R0
2
I/O
H-Z
SC
O
DB4 : SEG-C
PULL-DOWN
3
R0
3
I/O
H-Z
SD
O
DB4 : SEG-D
PULL-DOWN
4
R1
0
I/O
H-Z
SF
O
DB4 : SEG-E
PULL-DOWN
5
R1
1
I/O
H-Z
SE
O
DB4 : SEG-F
PULL-DOWN
6
R1
2
I/O
H-Z
SG
O
DB4 : SEG-G
PULL-DOWN
7
R1
3
I/O
H-Z
P4
O
DB7 : 7SEG COM
PULL-DOWN
8
R2
0
I/O
H-Z
P0
O
DB2 : DOT DP : NU
PULL-DOWN
9
R2
1
I/O
H-Z
P1
O
DB3 : DOT COM : NU
PULL-DOWN
10
R2
2
I/O
H-Z
P2
O
DB5 : 7SEG DP
PULL-DOWN
11
R2
3
I/O
H-Z
P3
O
DB5 : 7SEG ID
PULL-DOWN
12
RA
0
I
I
MODR
I
MODE RETURN : NU
PULL-UP
13
RA
1
I
I
CFSR
I
CASHIER, PAPER
FEED SWITCH :
NU RETURN
FEED SWITCH :
NU RETURN
PULL-UP
14
R3
0
I/O
H-Z
KEX0
O
KEY EXCHANGE0 : NU
15
R3
1
I/O
H-Z
KEX1
O
KEY EXCHANGE1 : NU
16
R3
2
I/O
H-Z
RQ
O
INPUT Q : NU
17
R3
3
I/O
H-Z
SKR0
O
kEY SELECTO : NU
18
R5
0
I/O
I
ST0
O
KEY SCAN ST0 : NU
19
R5
1
I/O
I
ST1
O
KEY SCAN ST1 : NU
20
R5
2
I/O
I
ST2
O
KEY SCAN ST2 : NU
21
R5
3
I/O
I
ST3
O
KEY SCAN ST3 : NU
22
R6
0
/INT0
I/O
I
POFF
I
P-OFF : NU
23
R6
1
/INT1
I/O
I
STOP
I
STOP : NU
PULL-UP
24
R6
2
/INT2
I/O
I
DDIG
O
DOT DISPLAY DIGIT INPUT : NU
25
R6
3
/INT3
I/O
I
DCS
O
DOT DISPLAY CONT./CS : NU
26
Vcc
Power supply
27
R4
0
/SCK
I/O
I
SCK
I
SCK
28
R4
1
/SI
I/O
I
HTS
I
HTS
29
R4
2
/S0
I/O
I
STH
O
STH
30
R4
3
/PWM
I/O
I
SDISP
I
DISP SELECT : NU
31
R7
0
/BUZZ I/O
I
BUZZ
O
BUZZER : NU
32
R7
1/
SCK2
I/O
I
DSCK
O
DOT DISP CONT. SCK : NU
33
R7
2
/SI2
I/O
I
SRES
O
SYSTEM RESET : NU
PULL-DOWN
34
R7
3
/S02
I/O
O
DS0
O
DOT DISP CONT. SO : NU
35
R8
0
I/O
O
SHEN
O
SHEN
36
R8
1
I/O
O
IRQ
O
IRQ : NU
37
R9
0
I
I
KR0
I
KEY RETURN 0 : NU
38
R9
1
I
I
KR1
I
KEY RETURN 1 : NU
39
R9
2
I
I
KR2
I
KEY RETURN 2 : NU
40
R9
3
I
I
KR3
I
KEY RETURN 3 : NU
41
RESET
CKDC IV RESET
42
OSC2
4.91 MHz
43
OSC1
4.91MHz
44
GND
GND
45
CL1
32.768 KHz
46
CL2
32.768 KHz
47
TEST
I
I
+5V
5V
48
D0
I/O
H-Z
G0
O
7 SEG DIG 0
PULL-DOWN
49
D1
I/O
H-Z
G1
O
7 SEG DIG 1
PULL-DOWN
50
D2
I/O
H-Z
G2
O
7 SEG DIG 2
PULL-DOWN
51
D3
I/O
H-Z
G3
I
7 SEG DIG 3
PULL-DOWN
52
D4
I/O
H-Z
G4
O
7 SEG DIG 4
PULL-DOWN
53
D5
I/O
H-Z
G5
O
7 SEG DIG 5
PULL-DOWN
54
D6
I/O
H-Z
G6
O
7 SEG DIG 6
PULL-DOWN
55
D7
I/O
H-Z
G7
O
7 SEG DIG 7 : NU
PULL-DOWN
56
D8
I/O
H-Z
G8
O
7 SEG DIG 8 : NU
PULL-DOWN
57
D9
I/O
H-Z
G9
O
7 SEG DIG 9 : NU
PULL-DOWN
58
D10
I/O
H-Z
G10
O
7 SEG DIG 10 : NU
PULL-DOWN
59
D11
I/O
H-Z
G11
O
7 SEG DIG 11 : NU
60
D12
I/O
H-Z
PO0
O
: NU
61
D13
I/O
H-Z
PO10
O
: NU
62
D14
I/O
H-Z
PO2
O
: NU
63
D15
I/O
H-Z
PO3
O
: NU
64
R0
0
I/O
H-Z
SA
O
DB4 : SEG-A
PULL-DOWN
NOTE 3: Pull-up/down in the table indicates that the lines concerned
require external pull-up/down resistance.
2-2-2. General description
•
As ER-A8DP connection check signal, the signal OPD is sent to
ECR PWB.
ECR PWB.
2-2-3. Signal description
The ER-A8DP incorporates only one new interfacing signal which is
described below. For other interfacing signals, refer to the main PWB
description.
OPD: Option display presence signal
described below. For other interfacing signals, refer to the main PWB
description.
OPD: Option display presence signal
ER-A8DP
OPD level
Main PWB judgement
Connected
High
Connected
Not connected
Low
Not connected
ERC side
KRES
HT S
SCK
SHEN
STH
ODS
ER-A8DP
RESET
HT S
SCK
SHEN
STH
OPT DISP CN
CKDC4
ECR Main PWB
+5V
RESET
SHEN
SCK
3
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