7751 Datasheet, PDF (268/540 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER

CONNECTION WITH EXTERNAL DEVICES
12.1 Signals required for accessing external devices
qExternal data bus width = 16 bits (BYTE = “L”)
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41
P83/TXD0
65
40
P82/RXD0
66
39
P81/CLK0
67
38
P80/CTS0/RTS0
68
37
VCC
69
36
AVCC
70
35
VREF
71
34
AVSS
72
VSS
73
M37751M6C-XXXFP
33
32
P77/AN7/ADTRG
74
31
P76/AN6
75
30
P75/AN5
76
29
P74/AN4
77
28
P73/AN3
78
27
P72/AN2
79
26
P71/AN1
80
25
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
A20/D4
A21/D5
A22/D6
A23/D7
R/W
BHE
ALE
HLDA
Vss
E
XOUT
XIN
RESET
CNVSS
BYTE
HOLD
qExternal data bus width = 8 bits (BYTE = “H”)
V : As 1 in microprocessor mode
: External address bus, external data bus,
bus control signal
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41
P83/TXD0
65
40
P82/RXD0
66
39
P81/CLK0
67
38
P80/CTS0/RTS0
68
37
VCC
69
36
AVCC
70
35
VREF
71
34
AVSS
72
M37751M6C-XXXFP
33
VSS
73
32
P77/AN7/ADTRG
74
31
P76/AN6
75
30
P75/AN5
76
29
P74/AN4
77
28
P73/AN3
78
27
P72/AN2
79
26
P71/AN1
80
25
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
A20/D4
A21/D5
A22/D6
A23/D7
R/W
BHE
ALE
HLDA
Vss
E
XOUT
XIN
RESET
CNVSS
BYTE
HOLD
V : As 1 in microprocessor mode
: External address bus, external data bus,
bus control signal
Fig. 12.1.1 Pin configuration in memory expansion and microprocessor modes (top view)
7751 Group User’s Manual
12–3