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Z80 Datasheet(PDF) 204 Page - Zilog, Inc.

Part # Z80
Description  Z80 CPU PERIPHERALS
PDF  330 Pages
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Manufacturer  ZILOG [Zilog, Inc.]
Direct Link  http://www.zilog.com
Logo ZILOG - Zilog, Inc.

Z80 Datasheet(HTML) 204 Page - Zilog, Inc.

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UM008101-0601
Parallel Input/Output

BRDY
Register B Ready (output, active High). The meaning of this signal is
similar tothatof A Readywiththe followingexception:Inthe Port Abidi-
rectional mode, this signal is High when the Port A input register is empty
and ready to accept data from the peripheral device.
Figure 3.
PIO Pin Functions
Z80–PIO
Port A
I/O
A0
A1
A2
A3
A4
A5
A6
A7
ARDY
ASTB
B0
B1
B2
B3
B4
B5
B7
BRDY
BSTB
B6
15
14
13
12
10
9
8
7
18
16
31
32
33
34
21
17
27
28
29
30
Port B
I/O
CPU
Data
D0
D1
A2
D3
D4
D5
D6
D7
Port B/A SEL
Control/Data SEL
Chip Enable
M1
IORQ
RD
+5V
Φ
INT
GND
19
20
1
40
39
38
3
2
6
5
26
11
25
23
4
37
36
35
INT Enable in
24
INT Enable out
22
BUS
PIO
Control
Interrupt
Control



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