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Counter Mode Register
The Counter Mode Register determines the operation mode for each of the three counters
on the MSM82C53 chip. The Counter Mode Register selects the counter involved, the
counter's read/load mode, its operation mode (that is, any of the six operation modes of
the MSM82C53), and the counting mode (binary or BCD).
The Counter Mode Register is an 8-bit register. Bit descriptions for each of these bits are
included in Appendix B, MSM82C53 Data Sheet.
Address:
Type:
Word Size: 8-bit
Bit Map:
7
6
SC1
SC0
Bit
7–6
National Instruments Corporation
Base address + 0B (hex)
Write-only
5
4
RL1
RL0
Name
Description
SC<1..0>
Counter Select Bits—These bits select the counter on
which the command operates.
Appendix D
3
2
M2
M1
SC1
SC0
0
0
Select counter 1
0
1
Select counter 2
1
0
Select counter 3
1
1
Read-back command
D-21
Register-Level Programming
1
0
M0
BCD
Operation
PC-LPM-16/PnP User Manual
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