National Instruments AT-DIO-32F, User Manual

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Programming Chapter 4
AT-DIO-32F User Manual 4-36 © National Instruments Corporation
Status Byte. If the STATUS* bit is zero in the Read-Back command, status information for the
selected counters is latched. The status byte format is as follows:
7 6 5 4 3 2 1 0
OUT NULL RW1 RW0 MODE2 MODE1 MODE0 BCD
Bit Name Description
7 OUT Counter Output.
The OUT bit reflects the current status of the counter output.
6 NULL Last Count Written Status.
If NULL is zero, the last count written to the selected counter has
been loaded into the counter. If NULL is set, the last count written
to the counter has not been loaded.
5-4 RW<1..0> RWSEL1 and RWSEL0 Status.
The RW1 and RW0 bits reflect the status of the RWSEL1 and
RWSEL0 bits of the selected counter.
3-1 MODE<2..0> MODE2, MODE1, and MODE0 Status.
The MODE2, MODE1, and MODE0 bits reflect the state of the
MODESEL2, MODESEL1, and MODESEL0 bits of the selected
counter.
0 BCD Binary Coded Decimal Select (BCDSEL) Status.
The BCD bit reflects the status of the BCDSEL bit of the selected
counter.
Refer to Appendix D, Intel Data Sheet, for more information on programming the counters.