
CONNECTION WITH EXTERNAL DEVICES
7702/7703 Group User’s Manual
12–3
12.1 Signals required for accessing external devices
Fig. 12.1.1 Pin configuration in memory expansion and microprocessor modes (top view)
RDY
A20/D4
A21/D5
A22/D6
A23/D7
R/W
BHE
ALE
HLDA
Vss
E
XOUT
XIN
RESET
CNVSS
BYTE
HOLD
P8
4
/CTS
1
/RTS
1
P8
5
/CLK
1
P8
6
/R
X
D
1
P8
7
/T
X
D
1
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
8
/D
8
A
9
/D
9
A
10
/D
10
A
11
/D
11
A
12
/D
12
A
13
/D
13
A
14
/D
14
A
15
/D
15
A
16
/D
0
A
17
/D
1
A
18
/D
2
A
19
/D
3
P7
0
/AN
0
P6
7
/TB2
IN
P6
6
/TB1
IN
P6
5
/TB0
IN
P6
4
/INT
2
P6
3
/INT
1
P6
2
/INT
0
P6
1
/TA4
IN
P6
0
/TA4
OUT
P5
7
/TA3
IN
P5
6
/TA3
OUT
P5
5
/TA2
IN
P5
4
/TA2
OUT
P5
3
/TA1
IN
P5
2
/TA1
OUT
P5
1
/TA0
IN
P5
0
/TA0
OUT
25
27
26
28
34
29
30
31
32
33
35
36
37
38
39
40
14
3
25
P83/TXD0
P82/RXD0
P81/CLK0
P80/CTS0/RTS0
VCC
AVCC
VREF
AVSS
VSS
P77/AN7/ADTRG
P76/AN6
P75/AN5
P74/AN4
P73/AN3
P72/AN2
P71/AN1
6
7
8
9
10 1112 131415 16 17 18 19 20 21
64
63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44
80
79
78
77
76
75
74
73
72
71
69
68
67
66
65
70
43 42
41
M37702M2BXXXFP
22 23 24
P4
7
P4
6
P4
5
P4
4
P4
3
V
P4
2
/
1
qExternal data bus width = 16 bits (BYTE = “L”)
V : As
1
in microprocessor mode
: External address bus, external data bus,
bus control signal
RDY
A20/D4
A21/D5
A22/D6
A23/D7
R/W
BHE
ALE
HLDA
Vss
E
XOUT
XIN
RESET
CNVSS
BYTE
HOLD
A
11
A
12
A
13
A
14
A
15
A
16
/D
0
A
17
/D
1
A
18
/D
2
A
19
/D
3
P8
4
/CTS
1
/RTS
1
P8
5
/CLK
1
P8
6
/R
X
D
1
P8
7
/T
X
D
1
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
8
A
9
A
10
14
3
2
5678
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23
24
P7
0
/AN
0
P6
7
/TB2
IN
P6
6
/TB1
IN
P6
5
/TB0
IN
P6
4
/INT
2
P6
3
/INT
1
P6
2
/INT
0
P6
1
/TA4
IN
P6
0
/TA4
OUT
P5
7
/TA3
IN
P5
6
/TA3
OUT
P5
5
/TA2
IN
P5
4
/TA2
OUT
P5
3
/TA1
IN
P5
2
/TA1
OUT
P5
1
/TA0
IN
P5
0
/TA0
OUT
25
27
26
28
34
29
30
31
32
33
35
36
37
38
39
40
P83/TXD0
P82/RXD0
P81/CLK0
P80/CTS0/RTS0
VCC
AVCC
VREF
AVSS
VSS
P77/AN7/ADTRG
P76/AN6
P75/AN5
P74/AN4
P73/AN3
P72/AN2
P71/AN1
64
63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44
80
79
78
77
76
75
74
73
72
71
69
68
67
66
65
70
43 42
41
M37702M2BXXXFP
P4
7
P4
6
P4
5
P4
4
P4
3
V
P4
2
/
1
qExternal data bus width = 8 bits (BYTE = “H”)
V : As
1
in microprocessor mode
: External address bus, external data bus,
bus control signal