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Operating Modes and Functions
6.5.2
Controlling Both Counters Synchronously
The 1P 281 offers the capability of using the software gate to start and stop
Method of
both counters per software simultaneously. Both software gates are con-
operation
trolled by control register 1.
Requirements
Synchronous mntrol of the counters requires that the two conditions
listed below be met.
– Operating mode OCSS or CCSS (any combination) must be set.
– The SYC bit must be set
Control register 3
7
Start/stop of
Setting the GSS bit in control register 1 causes the software gates to be
the counter
opened for both counters simultaneously. When the GSS bit is reset, the
gates are also closed.
Control register 1
7
The GSS bit in control register 2 has no function during synchronous con-
trol. The GEN 2 and GST 2 bits retain their function.
6 – 28
in control register
6
5
4
3
2
1
0
6
5
4
3
2
1
0
R 11192
3.
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