HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 358

• Manufacturer Part Number: HD6433044
• Description: (HD64 Series) Hitachi Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

10.4.3 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 TCR 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 4).
Sample Setup Procedure for Synchronization: Figure 10-26 shows a sample procedure for
setting up synchronization.
1.
2.
3.
4.
5.
Set the SYNC bits to 1 in TSNC for the channels to be synchronized.
When a value is written in TCNT in one of the synchronized channels, the same value is
simultaneously written in TCNT in the other channels (synchronized preset).
Set the CCLR1 or CCLR0 bit in TCR to have the counter cleared by compare match or input capture.
Set the CCLR1 and CCLR0 bits in TCR to have the counter cleared synchronously.
Set the STR bits in TSTR to 1 to start the synchronized counters.
Setup for synchronization
Select synchronization
Synchronous preset
Synchronous preset
Write to TCNT
Figure 10-26 Setup Procedure for Synchronization (Example)
1
2
Select counter clear source
synchronized to this
Synchronous clear
Counter clear
Start counter
channel?
Clearing
346
Yes
3
5
No
Select counter clear source
Synchronous clear
Start counter
4
5