SH7018 datasheet(145/431 Pages) RENESAS

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8.4.3

Synchronous Operation

There are two kinds of synchronous operation, synchronized preset and synchronized clear. The

synchronized preset operation allows multiple timer counters (TCNT) to be rewritten

simultaneously, while the synchronized clear operation allows multiple TCNT counters to be

cleared simultaneously using timer control register (TCR) settings.

The synchronizing mode can increase the number of TGR registers for a single time base. All five

channels can be set for synchronous operation.

Procedure for Selecting the Synchronizing Mode (Figure 8.14):

1. Set 1 in the SYNC bit of the timer synchro register (TSYR) to use the corresponding channel

in the synchronizing mode.

2. When a value is written in the TCNT in any of the synchronized channels, the same value is

simultaneously written in the TCNT in the other channels.

3. Set the counter to clear with output compare/input capture using bits CCLR2 to CCLR0 in the

TCR.

4. Set the counter clear source to synchronized clear using the CCLR2 to CCLR0 bits of the TCR.

5. Set the CST bits for the corresponding channels in the TSTR to 1 to start counting in the

TCNT.

Select counter

clear source

Channel that

generated clear

source?

Yes

Select

synchronizing mode

Set synchronizing

mode

Synchronized preset

Set TCNT

Start counting

Set counter

synchronous clear

Start counting

Counter clear

Synchronized clear

Synchronized preset

Synchronized clear

(1)

(2)

(3)

(5)

(4)

(5)

Figure 8.14 Procedure for Selecting Synchronizing Operation

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