Block Diagram - Sharp ER-A57R1 Service Manual

CHAPTER 2. 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

AB0,1
CS1,CS2
A0~A5
R,W
RDO,WRO
DB0~7
OPTCS
INT ( )
D0~D7 RES
CLOK
RES,POFF
RSRQ,TRQ1
OPC1
PX
+24V
INT ( ): TRNRDY1,2 RCVRDY1,2 TRNEMP1,2 BRK1,2
2) Pin configuration
TRNEMP3
TRANDY3
RCVRDY3
RXDATA0
TRCK
OPTCS
RSRQ
DCD1,2 CI1,2
RS-232
RCVDT1,2 CTS1,2
DSR1,2
Reciever
DTR1,2 TRNDT1,2
RS-232
USART
RTS1,2
Driver
Power +12V
supply
circuit
-12V
CS3 1
CS2 2
3
BRK3 4
5
6
7
8
RES 9
10
D0 11
D1 12
D2 13
D3 14
GND 15
D4 16
D5 17
D6 18
D7 19
20
A0 21
A1 22
A2 23
A3 24
A4 25
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).
UNIT NO.
UNIT0
UNIT1
CD1,2 CI1,2
UNIT2
RD1,2 CS1,2
UNIT3
DR1,2
Each UNIT of the OPC1 has the following functions:
1 Timer function
Used for the timer between characters in data reception.
ER1,2 SD1,2
2 Address decode
USART chip select output and own select.
RS1,2
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(Not used):
4 Simple IRC send/receive control (UNIT3 only) : Not used
OPC1
F256004PJ
4 ™ 21
Purpose
RS-232 Used.
RS-232 Used.
RS-232 Not used.
RS-232/Simple IRC Not used.
For RS-232
For simple IRC
75 SL12
74 RCVRDY2
73 RCVDT1
72 RCVRDY1
71 TRNRDY1
70 BRK1
69 DB7
68 DB6
67 DB5
66 DB4
65 GND
64 DB3
63 DB2
62 DB1
61 DB0
60 TRNEMP1
59 TRNRDY0
58 RCVDT0
57 RCVRDY0
56 TRNEMP0
55 BRK0
54 SL30
53 XOUT
52 SL22
51 RES
ER-A5RS