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Z80 Datasheet(PDF) 222 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) 222 Page - Zilog, Inc.

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UM008101-0601
Parallel Input/Output

Control Interface
A typical control mode application is illustrated in Figure 16. In this
example, an industrial process is to be monitored. The occurrence of any
abnormal operating condition is to be reported to a Z80 CPU-based control
system. The process control and status word has the following format:
The PIO may be used as follows. First, Port A is set for Mode 3 operation
by writing the following control word to Port A.
Whenever Mode 3 is selected, the next control word sent to the port must
be an I/O select word. In this example, port data lines A5, A3, and A0 are
selected as inputs, and the following control word is written:
Next, the appropriate interrupt vector must be loaded (refer to the Z80 CPU
User’s Manual for details):
An interrupt control word is next sent to the port:
The mask word following the interrupt mode word is:
D7
D6
D5
D4
D3
D0
Halt
Processing
D2
D1
Special
Test
Turn On
Power
Power
Failure Alarm
Temp.
Alarm
Turn On
Heaters
Pressurize
System
Pressure
Alarm
11
X
X
D7
D6
D5
D4
D3
D0
D2
D1
11
11
00
1
0
D7
D6
D5
D4
D3
D0
D2
D1
10
0
1
V5
V4
D7
D6
D5
D4
D3
D0
D2
D1
V3
V2
V1
0
V1
V6
Interrupt Control
11
D7
D6
D5
D4
D3
D0
D2
D1
01
11
10
Enable
Interrupts
OR
Logic
Active
High
Mask
Follows



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