H8SLASH3021 datasheet(261/712 Pages) RENESAS

261 / 712 page

8. 16-Bit Integrated Timer Unit (ITU)

Rev.2.00 Mar. 22, 2007 Page 237 of 684

REJ09B0352-0200

8.4.3

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 8.26 shows a sample procedure for

setting up synchronization.

Setup for synchronization

Synchronous preset

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).

Select synchronization

Synchronous preset

Write to TCNT

Synchronous clear

Clearing

synchronized to this

channel?

Select counter clear source

Start counter

Counter clear

Synchronous clear

Start counter

Select counter clear source

Yes

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.

Figure 8.26 Setup Procedure for Synchronization (Example)

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