Pin functions, Figure 3, Z80 cpu i/o pin configuration – Zilog Z08470 User Manual
Page 17: Z80 cpu
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UM008007-0715
Pin Functions
Z80 CPU
User Manual
5
Pin Functions
A15–A0.
Address Bus (output, active High, tristate). A15–A0 form a 16-bit Address Bus,
which provides the addresses for memory data bus exchanges (up to 64 KB) and for I/O
device exchanges.
BUSACK.
Bus Acknowledge (output, active Low). Bus Acknowledge indicates to the
requesting device that the CPU address bus, data bus, and control signals MREQ, IORQ,
Figure 3. Z80 CPU I/O Pin Configuration
System
Control
CPU
Control
CPU
Bus
Control
Z80 CPU
Address
Bus
Data
Bus
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
D0
D1
D3
D4
D5
D6
D7
D2
30
31
32
33
34
35
36
37
38
39
40
14
15
12
8
7
9
10
13
1
2
3
4
5
M1
MREQ
IORQ
RD
WR
RFSH
HALT
INT
NMI
RESET
BUSRQ
BUSACK
CLK
+5V
GND
WAIT
27
19
20
21
22
26
18
24
16
17
28
25
23
6
11
29
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