National Instruments PC-LPM-16/PnP - Manual (Page 108)

Appendix D Register-Level Programming
PC-LPM-16/PnP User Manual D-36  National Instruments Corporation
Programming the MSM82C53 Counter/Timer
Counters 0, 1, and 2 of the MSM82C53 counter/timer (except the CLK0
signal of counter 1) are available for general-purpose timing
applications. Counter 0 has a fixed 1 MHz clock input and can be used
as the sample interval counter of A/D conversion. Write and read
operations to the MSM82C53 are 8-bit operations. For general
programming details, refer to Appendix B, MSM82C53 Data Sheet.
a.Book : l.Appendix D Page 36 Wednesday, November 20, 1996 6:36 PM