Read Sharp ER-A490 (serv.man4) Service Manual online
III. HARDWARE DESCRIPTION FOR
ER-A5RS
1. General
The ER-A5RS is composed of the following blocks:
1) RS-232 receiver (75189A)
2) RS-232 driver (75188)
3) USART (MB89371A)
4) Gate array (OPC1: F256004PJ)
2. Block diagram
3. Description of main LSI
3-1. OPC1 (F256004PJ)
1) General description
The OPC1 is a gate array of integrated peripheral circuits of RS-
232/Simple IRC interface.
One chip of the OPC1 is equipped with four communication circuits.
(Three of them are for RS-232 only: UNIT 0 ~ 2, one is for selection of
simple IRC/RS-232: UNIT 3)
The ER-A5RS uses UNIT0 (RS-232 interface) and UNIT7 (RS-232
interface).
232/Simple IRC interface.
One chip of the OPC1 is equipped with four communication circuits.
(Three of them are for RS-232 only: UNIT 0 ~ 2, one is for selection of
simple IRC/RS-232: UNIT 3)
The ER-A5RS uses UNIT0 (RS-232 interface) and UNIT7 (RS-232
interface).
UNIT NO.
Purpose
ER-A5RS
UNIT0
RS-232
Used.
UNIT1
RS-232
Used.
UNIT2
RS-232
Not used.
UNIT3
RS-232/Simple IRC
Not used.
Each UNIT of the OPC1 has the following functions:
1
Timer function
Used for the timer between characters in data reception.
Used for the timer between characters in data reception.
2
Address decode
USART chip select output and own select.
USART chip select output and own select.
3
Interruption control
RSRQ, TRRQ output using outputs from USART (TRNRDY,
TRNEMP, RCVRDY, BRK) and RS-232 control signals (CI, CTS,
CD) as interruption factors.
(For the simple IRC, TRNEMP is excluded.)
RSRQ, TRRQ output using outputs from USART (TRNRDY,
TRNEMP, RCVRDY, BRK) and RS-232 control signals (CI, CTS,
CD) as interruption factors.
(For the simple IRC, TRNEMP is excluded.)
*
RSRQ:
TRRQ(Not used):
TRRQ(Not used):
For RS-232
For simple IRC
For simple IRC
4
Simple IRC send/receive control (UNIT3 only) : Not used
2) Pin configuration
CS1,CS2
A0~A5
R,W
RDO,WRO
DB0~7
OPTCS
INT (
✽
)
D0~D7
RES
RES,POFF
CLOK
RSRQ,TRQ1
AB0,1
DCD1,2 CI1,2
RCVDT1,2 CTS1,2
USART
DSR1,2
RS-232
Reciever
DTR1,2 TRNDT1,2
CD1,2 CI1,2
RD1,2 CS1,2
DR1,2
ER1,2 SD1,2
RS-232
Driver
RS1,2
Power
supply
circuit
+12V
-12V
RTS1,2
OPC1
PX
+24V
INT (
✽
): TRNRDY1,2 RCVRDY1,2 TRNEMP1,2 BRK1,2
CS3
CS2
TRNEMP3
BRK3
TRANDY3
RCVRDY3
RXDATA0
TRCK
RES
OPTCS
D0
D1
D2
D3
GND
D4
D5
D6
D7
RSRQ
A0
A1
A2
A3
A4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
T
RNE
M
P
2
CI
3/
P
2I
TRNRDY
2
RCV
DT2
SL
21
SL
20
SL
32
SL31
X1
X2
GN
D
VC
C
CD2
CI
2
CT
S
2
US
IC
H
TRRQ
TR
V
CT
S
0
CD
0
SL0
0
SL01
SL
02
SL
10
SL11
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
83
82
81
80
79
78
77
76
A5
PO
F
F
TRQ
1
WR
O
RDO
CS
1
AB
1
R
AB0
CS
0
W
CD3
/P
0
VC
C
GN
D
RC
V
D
T3
TX
E
CTS
3/
P
1
RT
S
1
CI
1
CD1
CTS
1
CI
0
RT
S
0
PX
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
SL12
RCVRDY2
RCVDT1
RCVRDY1
TRNRDY1
BRK1
DB7
DB6
DB5
DB4
GND
DB3
DB2
DB1
DB0
TRNEMP1
TRNRDY0
RCVDT0
RCVRDY0
TRNEMP0
BRK0
SL30
XOUT
SL22
RES
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
OPC1
F256004PJ
TR
Q
2
3 – 1
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