CPU PIN FUNCTION
Pin No. Terminal Name I N / O U T Function
1
PB14
2
PB15
3
VSS
4 - 11
AD0 - AD7
12
VSS
13 - 14
AD8 - AD9
15
VCC
16 - 21
AD10 - AD15
22
VSS
23 - 30
A0 - A7
31
VSS
32 - 33
A8, A9
34 - 39
A10 - A15
40
VSS
41, 42
A16, A17
43
VCC
44 - 47
A18 - A21
48 - 50
CS0 - CS2
51
CASL
52
VSS
53
PAO
54
RAS
55
CS6
56
WAIT
57
WR
58
PA5
59
RD
60
PA7
61
VSS
62
PA8
63
PA9
64 - 66
PA10 - PA12
67
DREQ0
68
IRQ2
69
PA15
70
VCC
71
CK
72
VSS
73
EXTAL
74
XTAL
75 - 77
VCC, NMI, VPP
78
WDTOVF
79
RES
80
MD0
81
MD1
82
MD2
OUT
Timing pattern output.
—
Not used.
IN
Ground terminal.
IN/OUT Address bus.
IN
Ground terminal.
—
Not used.
IN
Power source.
—
Not used.
IN
Ground terminal.
OUT
Address bus.
IN
Ground terminal.
OUT
Address bus.
—
Not used.
IN
Ground terminal.
—
Not used.
IN
Power source.
—
Not used.
—
Not used.
OUT
CAS(Column Address Strobe) signal for D RAM.
IN
Ground terminal.
—
Not used.
OUT
RAS(Row Address Strobe) signal for D RAM.
OUT
Chip select signal.
—
Not used.
OUT
Write enable signal for outer memory (low-order 8-bit).
OUT
Write enable signal for outer memory (high-order 8-bit).
OUT
Read enable signal for outer memory.
—
Not used.
IN
Ground terminal.
IN
Bus request signal.
OUT
Interrupt request signal.
—
Not used.
IN
Interrupt request signal.
IN
Interrupt request signal.
IN
Interrupt request signal.
IN
Power source.
OUT
System clock pulse.
IN
Ground terminal.
IN
Clock pulse input.
—
Not used.
IN
Power source.
—
Not used.
IN
Reset signal input.
IN
Ground terminal.
IN
Connected to VCC3.
IN
Connected to ground.
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