Datasheet

Rev.6.00 Oct.28.2004 page 377 of 1016
REJ09B0138-0600H
10.4.3 Synchronous Operation
In synchronous operation, the values in a number of TCNT counters can be rewritten simultaneously (synchronous
presetting). Also, a number of TCNT counters can be cleared simultaneously by making the appropriate setting in TCR
(synchronous clearing).
Synchronous operation enables TGR to be incremented with respect to a single time base.
Channels 0 to 5 can all be designated for synchronous operation.
Example of Synchronous Operation Setting Procedure: Figure 10-14 shows an example of the synchronous operation
setting procedure.
Set synchronous
operation
Synchronous operation
selection
Set TCNT
Synchronous presetting
<Synchronous presetting>
[1]
[2]
Synchronous clearing
Select counter
clearing source
<Counter clearing>
[3]
Start count [5]
Set synchronous
counter clearing
<Synchronous clearing>
[4]
Start count [5]
Clearing
source generation
channel?
No
Yes
[1]
[2]
[3]
[4]
[5]
Set to 1 the SYNC bits in TSYR corresponding to the channels to be designated for synchronous
operation.
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.
Use bits CCLR2 to CCLR0 in TCR to specify TCNT clearing by input capture/output compare,
etc.
Use bits CCLR2 to CCLR0 in TCR to designate synchronous clearing for the counter clearing
source.
Set to 1 the CST bits in TSTR for the relevant channels, to start the count operation.
Figure 10-14 Example of Synchronous Operation Setting Procedure
Example of Synchronous Operation: Figure 10-15 shows an example of synchronous operation.
In this example, synchronous operation and PWM mode 1 have been designated for channels 0 to 2, TGR0B 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 sources.
Three-phase PWM waveforms are output from pins TIOC0A, TIOC1A, and TIOC2A. At this time, synchronous
presetting, and synchronous clearing by TGR0B compare match, is performed for channel 0 to 2 TCNT counters, and the
data set in TGR0B is used as the PWM cycle.