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9.4.3
Synchronization
The synchronization function enables two or more timer counters to be synchronized by writing
the same data to them simultaneously (synchronous preset). With appropriate 16TCR settings, two
or more timer counters can also be cleared simultaneously (synchronous clear). Synchronization
enables additional general registers to be associated with a single time base. Synchronization can
be selected for all channels (0 to 2).
Sample Setup Procedure for Synchronization: Figure 9.24 shows a sample procedure for
setting up synchronization.
Setup for synchronization
Select synchronization
Synchronous preset
Write to 16TCNT
Synchronous preset
1.
Set the SYNC bits to 1 in TSNC for the channels to be synchronized.
2.
When a value is written in 16TCNT in one of the synchronized channels, the same value is
simultaneously written in 16TCNT in the other channels.
3.
Set the CCLR1 or CCLR0 bit in 16TCR to have the counter cleared by compare match or input capture.
4.
Set the CCLR1 and CCLR0 bits in 16TCR to have the counter cleared synchronously.
5.
Set the STR bits in TSTR to 1 to start the synchronized counters.
Figure 9.24 Setup Procedure for Synchronization (Example)
322
1
Synchronous clear
Clearing
synchronized to this
channel?
2
Yes
Select counter clear source
Start counter
Counter clear
No
3
Select counter clear source
5
Start counter
Synchronous clear
4
5
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