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B-4
I/O Address Map
PIO-96 User’s Manual
Table B-3 shows example control-byte codes for Mode 0.
When a port is configured as an output, the data that the port outputs can be returned by reading
the same location. However, this may not reflect the actual state of the output lines if one or
more is shorted. The state of the output
latch
is being read, not the buffered output lines.
Table B-3
Example control bytes for mode 0
Control byte (hexadecimal)
Configuration
80
PA, PB & PC all outputs
81
PA, PB, PC-upper outputs, PC-lower input
82
PA & PC outputs, PB input
8B
PA output, PB & PC inputs
9B
PA, PB & PC all inputs
Etc.... (there are 15 combinations in Mode 0)
Summary of Contents for PIO-96
Page 1: ...PIO 96 ISABusDigitalI OBoard Instruction Manual...
Page 8: ...ii...
Page 10: ...iv...
Page 12: ...vi...
Page 13: ...1 General Description...
Page 16: ...1 4 General Description PIO 96 User s Manual...
Page 17: ...2 Installation...
Page 27: ...3 Programming...
Page 29: ...A Specifications...
Page 31: ...B I O Address Map...
Page 35: ...C User Serviceable Parts...
Page 39: ...This page intentionally left blank...
Page 40: ...Keithley Instruments Inc 28775 Aurora Road Cleveland Ohio 44139 Printed in the U S A...