HD64F36034 datasheet(230/592 Pages) RENESAS

230 / 592 page

Section 12 Timer Z

Rev. 4.00 Mar. 15, 2006 Page 198 of 556

REJ09B0026-0400

12.4.4

Synchronous Operation

In synchronous operation, the values in a number of TCNT counters can be rewritten

simultaneously (synchronous presetting). Also, a number of TCNT counters can be cleared

simultaneously by making the appropriate setting in TCR (synchronous clearing). Synchronous

operation enables GR to be increased with respect to a single time base.

Figure 12.19 shows an example of the synchronous operation setting procedure.

Yes

Synchronous operation

selection

Clearing

source generation

channel?

Set synchronous

operation

Select counter

clearing source

Synchronous presetting

Set TCNT

Synchronous clearing

[1]

[2]

[3]

Select counter

clearing source

[4]

Start counter operation

[5]

Start counter operation

[5]

[1] Set the SYNC bits in TMDR to 1.

[2] When a value is written to either of the TCNT counters, the same value is simultaneously written to the

other TCNT counter.

[3] Set bits CCLR1 and CCLR0 in TCR to specify counter clearing by compare match/input capture.

[4] Set bits CCLR1 and CCLR0 in TCR to designate synchronous clearing for the counter clearing source.

[5] Set the STR bit in TSTR to 1 to start the count operation.

Figure 12.19 Example of Synchronous Operation Setting Procedure

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