
Rev. 2.0, 09/02, page 241 of 732
Example of Synchronous Operation Setting Procedure:
Figure 11.11 shows an example of the
synchronous operation setting procedure.
No
Yes
Set synchronous
operation
<Synchronous presetting>
<Counter clearing>
<Synchronous clearing>
Clearing
source generation
channel
Select counter
clearing source
Start count
Set synchronous
counter clearing
Start count
[1]
[3]
[5]
[4]
[5]
[2]
Synchronous operation
selection
[1] Set to 1 the SYNC bits in TSYR corresponding to the channels to be designated for synchronous
operation.
[2] When the TCNT counter of any of the channels designated for synchronous operation is written to,
the same value is simultaneously written to the other TCNT counters.
[3] Use bits CCLR2 to CCLR0 in TCR to specify TCNT clearing by input capture/output compare, etc.
[4] Use bits CCLR2 to CCLR0 in TCR to designate synchronous clearing for the counter clearing source.
[5] Set to 1 the CST bits in TSTR for the relevant channels, to start the count operation.
Set TCNT
Synchronous presetting
Synchronous clearing
Figure 11.11 Example of Synchronous Operation Setting Procedure
Example of Synchronous Operation:
Figure 11.12 shows an example of synchronous operation.
In this example, synchronous operation and PWM mode 1 have been designated for channels 0 to
2, TGRB_0 compare match has been set as the channel 0 counter clearing source, and
synchronous clearing has been set for the channel 1 and 2 counter clearing source.
Three-phase PWM waveforms are output from pins TIOC0A, TIOC1A, and TIOC2A. At this
time, synchronous presetting, and synchronous clearing by TGRB_0 compare match, are
performed for channel 0 to 2 TCNT counters, and the data set in TGRB_0 is used as the PWM
cycle.
For details of PWM modes, see section 11.4.5, PWM Modes.