Register Description For The Interrupt Control Registers; Table C-2. Port C Set/Reset Control Words - National Instruments PC-DIO-24/PnP User Manual

Register Description for the Interrupt Control Registers

© National Instruments Corporation
Table C-2 shows the control words for setting or resetting each bit in
port C. Notice that bit 7 of the control word is cleared when
programming the set/reset option for the bits of port C.

Table C-2. Port C Set/Reset Control Words

Bit Set Control
Bit Number
0
1
2
3
4
5
6
7
There are two interrupt control registers on the PC-DIO-24PnP. One of
these registers has individual enable bits for the two interrupt lines from
the 82C55A device. The other register has a master interrupt enable bit.
When writing to these registers, set all reserved bits to zero. The bit
maps and signal definitions are listed as follows.
Appendix C
Bit Reset
Word Control Word
0xxx0001 0xxx0000
0xxx0011 0xxx0010
0xxx0101 0xxx0100
0xxx0111 0xxx0110
0xxx1001 0xxx1000
0xxx1011 0xxx1010
0xxx1101 0xxx1100
0xxx1111 0xxx1110
C-5
Register-Level Programming
The Bit Set or
Reset in Port C
xxxxxxxb
xxxxxxbx
xxxxxbxx
xxxxbxxx
xxxbxxxx
xxbxxxxx
xbxxxxxx
bxxxxxxx
PC-DIO-24/PnP User Manual