National Instruments PC-LPM-16/PnP - Manual (Page 94)

Appendix D Register-Level Programming
PC-LPM-16/PnP User Manual D-22  National Instruments Corporation
Counter Mode Register
(Continued)
5–4 RL<1..0> Read/Write Select Bits—These bits select data written
to or read from a counter, or these bits send a Counter
Latch command.
The Counter Latch command latches the current count
of the register selected by SC1 and SC0. The next read
from the selected counter returns the latched data.
RL1 RL0 Operation
0 0 Counter Latch command
0 1 Read and write least significant
byte only
1 0 Read and write most significant
byte only
1 1 Read and write least significant
byte then most significant byte
a.Book : l.Appendix D Page 22 Wednesday, November 20, 1996 6:36 PM