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Register Map and Descriptions Appendix D
Lab-PC+ User Manual D-2 © National Instruments Corporation
Table D-1. Lab-PC+ Register Map
Register Name Offset Address
(Hex)
Type Size
Configuration and Status Register Group
Command Register 1 00 Write-only 8-bit
Status Register 00 Read-only 8-bit
Command Register 2 01 Write-only 8-bit
Command Register 3 02 Write-only 8-bit
Command Register 4 OF Write-only 8-bit
Analog Input Register Group
A/D FIFO Register 0A Read-only 8-bit
A/D Clear Register 08 Write-only 8-bit
Start Convert Register 03 Write-only 8-bit
DMATC Interrupt Clear Register 0A Write-only 8-bit
Analog Output Register Group
DAC0 Low-Byte Register 04 Write-only 8-bit
DAC0 High-Byte Register 05 Write-only 8-bit
DAC1 Low-Byte Register 06 Write-only 8-bit
DAC1 High-Byte Register 07 Write-only 8-bit
8253 Counter/Timer Register Group A
Counter A0 Data Register 14 Read-and-write 8-bit
Counter A1 Data Register 15 Read-and-write 8-bit
Counter A2 Data Register 16 Read-and-write 8-bit
Counter A Mode Register 17 Write-only 8-bit
Timer Interrupt Clear Register 0C Write-only 8-bit
8253 Counter/Timer Register Group B
Counter B0 Data Register 18 Read-and-write 8-bit
Counter B1 Data Register 19 Read-and-write 8-bit
Counter B2 Data Register 1A Read-and-write 8-bit
Counter B Mode Register 1B Write-only 8-bit
8255A Digital I/O Register Group
Port A Register 10 Read-and-write 8-bit
Port B Register 11 Read-and-write 8-bit
Port C Register 12 Read-and-write 8-bit
Digital Control Register 13 Write-only 8-bit
Interval Counter Register Group
Interval Counter Data Register 1E Write-only 8-bit
Interval Counter Strobe Register 1F Write-only 8-bit