Hitachi H8S/2378, H8S/2378R Series Hardware Manual page 581

Synchronous operation
selection
Set synchronous
operation
Synchronous presetting
Set TCNT
<Synchronous presetting>
[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.
Figure 11.10 Example of Synchronous Operation Setting Procedure
Example of Synchronous Operation: Figure 11.11 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 TIOCA0, TIOCA1, and TIOCA2. At this
time, synchronous presetting, and synchronous clearing by TGRB_0 compare match, is performed
for channel 0 to 2 TCNT counters, and the data set in TGRB_0 is used as the PWM cycle.
For details on PWM modes, see section 11.4.5, PWM Modes.
[1]
Synchronous clearing
[2]
Clearing
source generation
channel?
Yes
Select counter
clearing source
Start count
<Counter clearing>
No
Set synchronous
[3]
counter clearing
[5] Start count
<Synchronous clearing>
Rev. 1.0, 09/01, page 537 of 904
[4]
[5]