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Appendix D
Register-Level Programming
Timer Interrupt Clear Register
Write to the Timer Interrupt Clear Register to clear the interrupt request asserted when a
low pulse is detected on the counter 2 output.
Address:
Type:
Word Size: 8-bit
Bit Map:
Digital I/O Register Group
Digital Output Register
Write to the Digital Output Register to control the eight digital output lines of the I/O
connector. The pattern contained in the Digital Output Register is driven onto the eight
digital output lines of the I/O connector.
Address:
Type:
Word Size: 8-bit
Bit Map:
7
6
D7
D6
Bit
7–0
PC-LPM-16/PnP User Manual
Base address + 06 (hex)
Write-only
Not applicable, no bits used.
The Digital I/O Register Group contains two registers, the Digital
Output Register and the Digital Input Register. The Digital Output
Register drives the eight digital output lines of the I/O connector. The
Digital Input Register returns the digital state of the eight digital input
lines of the I/O connector.
Bit descriptions for the register in the Digital I/O Register Group
follow.
Base address + 04 (hex)
Write-only
5
4
D5
D4
Name
Description
D<7..0>
8-Bit Output Data 7 through 0—These eight bits
control the digital output lines DOUT 0 through
DOUT 7.
3
2
D3
D2
D-24
1
0
D1
D0
National Instruments Corporation
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