SH7261 datasheet(498/1348 Pages) RENESAS

498 / 1348 page

Section 12 Multi-Function Timer Pulse Unit 2 (MTU2)

Rev. 2.00 Sep. 07, 2007 Page 466 of 1312

REJ09B0320-0200

12.4.2

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 TGR to be incremented with respect to a single time base.

Channels 0 to 4 can all be designated for synchronous operation. Channel 5 cannot be used for

synchronous operation.

(1)

Example of Synchronous Operation Setting Procedure:

Figure 12.12 shows an example of the synchronous operation setting procedure.

Yes

Set synchronous

operation

Clearing

source generation

channel?

Select counter

clearing source

Start count

Set synchronous

counter clearing

Start count

[1]

[3]

[5]

[4]

[5]

[2]

Synchronous operation

selection

[1] Set to 1 the SYNC bits in TSYR corresponding to the channels to be designated for synchronous

operation.

[2] When the TCNT counter of any of the channels designated for synchronous operation is written to,

the same value is simultaneously written to the other TCNT counters.

[3] Use bits CCLR2 to CCLR0 in TCR to specify TCNT clearing by input capture/output compare, etc.

[4] Use bits CCLR2 to CCLR0 in TCR to designate synchronous clearing for the counter clearing source.

[5] Set to 1 the CST bits in TSTR for the relevant channels, to start the count operation.

Set TCNT

Synchronous presetting

Synchronous clearing

Figure 12.12 Example of Synchronous Operation Setting Procedure

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