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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)
Содержание PIO-96
Страница 1: ...PIO 96 ISABusDigitalI OBoard Instruction Manual...
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Страница 13: ...1 General Description...
Страница 16: ...1 4 General Description PIO 96 User s Manual...
Страница 17: ...2 Installation...
Страница 27: ...3 Programming...
Страница 29: ...A Specifications...
Страница 31: ...B I O Address Map...
Страница 35: ...C User Serviceable Parts...
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Страница 40: ...Keithley Instruments Inc 28775 Aurora Road Cleveland Ohio 44139 Printed in the U S A...