National Instruments PC-LPM-16/PnP - Manual (Page 90)

Appendix D Register-Level Programming
PC-LPM-16/PnP User Manual D-18  National Instruments Corporation
Counter/Timer (MSM82C53) Register Group
The five registers making up the Counter/Timer Register Group access
the onboard MSM82C53 counter/timer. The MSM82C53 has three
counters: counter 0, counter 1, and counter 2. Counter 0 controls
onboard data acquisition timing, and all three counters are available for
general-purpose timing functions.
The MSM82C53 has three independent 16-bit counters and one 8-bit
Mode Register. The Mode Register sets the mode of operation for each
of the three counters. Writing to the Timer Interrupt Clear Register
clears the interrupt request asserted when a low pulse is detected on the
output of counter 2.
Bit descriptions for the registers in the Counter/Timer Register Group
are given in the following pages.
a.Book : l.Appendix D Page 18 Wednesday, November 20, 1996 6:36 PM