Read Sharp ER-A750 (serv.man2) Service Manual online
5) Pin description (For IC4: MCR I/F)
No.
Pin No.
Pin name
I/O
ER-A7RS
Data bus
1
1
DB4
I/O
D4
2
2
DB5
I/O
D5
3
3
DB6
I/O
D6
4
4
DB7
I/O
D7
5
41
DB0
I/O
D0
6
42
DB1
I/O
D1
7
44
DB2
I/O
D2
8
45
DB3
I/O
D3
9
46
RCVDT1
I
RDD1
Track1 data signal
10
13
RCVDT2
I
RDD2
Track2 data signal
11
47
GND
–
GND
12
5
TRNCLK1-
I
NC
Data transmission clock
13
15
TRNCLK2-
I
NC
14
6
W-
I
WR-
Write signal
15
7
CS1-
I
MCR1S-
Track1 select signal
16
12
CS2-
I
MCR2S-
Track2 select signal
17
8
RSLCT0
I
A0
Address bus
18
11
RSLCT1
I
A1
19
9
R-
I
RD-
Read signal
20
10
RCVRDY1
O
RDY1
RS-232 data reception enable signal
21
16
RCVRDY2
O
RDY2
22
28
TRNRDY1
O
NC
23
17
TRNRDY2
O
NC
24
29
BRK1
O
NC
25
18
BRK2
O
NC
26
30
CTS1-
I
GND
27
20
CTS2-
I
GND
28
31
TRNEMP1
O
NC
29
21
TRNEMP2
O
NC
30
14
NC
–
NC
31
24
NC
–
NC
32
38
NC
–
NC
33
48
NC
–
NC
34
19
OPEN
NC
35
43
OPEN
NC
36
32
TRNDT1
O
NC
37
22
TRNDT2
O
NC
38
35
DSR1-
I
CLS1-
Track1 card detecting signal
39
23
DSR2-
I
CLS2-
Track2 card detecting signal
40
36
RTS1-
O
NC
41
25
RTS2-
O
NC
42
37
DTR1-
O
NC
Data terminal ready signal
43
26
DTR2-
O
NC
44
39
RCVCLK1-
I
RCP1
Track1 clock pulse signal
45
27
RCVCLK2-
I
RCP2
Track2 clock pulse signal
46
33
CLOCK
I
USART
Clock signal
47
34
RST
I
USART
RESET signal
48
40
VCC
–
VCC
+5V
– 7 –
