SH7021 datasheet(272/509 Pages) RENESAS

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10.4.3

Synchronizing Mode

In the synchronizing mode, two or more timer counters can be rewritten simultaneously

(synchronized preset). Multiple timer counters can also be cleared simultaneously using TCR

settings (synchronized clear). The synchronizing mode can increase the general registers for a

single time base. All five channels can be set for synchronous operation.

Procedure for Selecting the Synchronizing Mode (figure 10.26):

1. Set 1 in the SYNC bit of the timer synchro register (TSNC) to use the channels 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 compare match/input capture using bits CCLR1 and CCLR0 in the

TCR.

4. Set the counter clear source to synchronized clear using the CCLR1 and CCLR0 bits.

5. Set the STR bits 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

Select counter

clear source

Start counting

Counter clear

Synchronized clear

Synchronizing preset

Synchronized clear

(1)

(2)

(3)

(5)

(4)

(5)

Figure 10.26 Procedure for Selecting the Synchronizing Mode

SH7021 Datasheet(PDF) 272 Page - Renesas Technology Corp

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