Read Sharp ER-A750 (serv.man2) Service Manual online
1. S1 : RS232 channel setting setting
S1
CON3
Setting
S1
CON4
Setting
1
2
3
4
5
6
0
0
0
RS232 invalid
0
0
0
RS232 invalid
1
0
0
Channel 1
1
0
0
Channel 1
0
1
0
Channel 2
0
1
0
Channel 2
1
1
0
Channel 3
1
1
0
Channel 3
0
0
1
Channel 4
0
0
1
Channel 4
1
0
1
Channel 5
1
0
1
Channel 5
0
1
1
Channel 6
0
1
1
Channel 6
1
1
1
Channel 7
1
1
1
Channel 7
2. JP1, JP2 : /CTS signal setting
3. JP3, JP4 : CI signal setting
4. IPL SWITCH : IPL mode setting
5. MCR SWITCH : MCR setting
6. Description of main LSI
6-1. OPC1 (F25600) IC6
1) General description
The OPC1 is a gate array of integrated peripheral circuits of
RS-232/Simple IRC interface.
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)
(Three of them are for RS-232 only: UNIT 0 ~ 2, one is for selection
of simple IRC/RS-232: UNIT 3)
The ER-A7RS uses UNIT0 (RS-232 interface) and UNIT7 (RS-232
interface).
interface).
UNIT NO.
Purpose
ER-A7RS
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.
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):
For RS-232
For simple IRC
For simple IRC
4
Simple IRC send/receive control (UNIT3 only) : Not used
2) Pin configuration
S1
O
F
F
1
2
3
4
5
6
COM3
COM4
1
0
COM3 Channl No.: 3
(Initial setting)
(Initial setting)
COM4 Channl No.: 4
(Initial setting)
(Initial setting)
JP1/JP2
1
3
/CTS signal : GND
Initial setting
JP1/JP2
1
3
/CTS signal : Enable
JP3/JP4
1
3
CI signal input
Initial setting
JP3/JP4
1
3
VCC (+5V) input
IPL mode : OFF
Initial setting
OFF
ON
ILP SW
IPL mode : ON
OFF
ON
ILP SW
MCR : Valid
Initial setting
MCR SW
INVALID VALID
MCR : Invalid
MCR SW
INVALID VALID
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
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
F256004
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