H8SXSLASH1663R datasheet(768/1504 Pages) RENESAS

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Section 14 16-Bit Timer Pulse Unit (TPU)

Rev. 2.00 Sep. 24, 2008 Page 736 of 1468

REJ09B0412-0200

14.4.2

Synchronous Operation

In synchronous operation, the values in multiple TCNT counters can be rewritten simultaneously

(synchronous presetting). Also, multiple TCNT counters can be cleared simultaneously

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

Synchronous operation enables TGR to be incremented with respect to a single time base.

Channels 0 to 5 can all be designated for synchronous operation.

(1)

Example of Synchronous Operation Setting Procedure

Figure 14.11 shows an example of the synchronous operation setting procedure.

Synchronous operation

selection

Set TCNT

Synchronous presetting

[1]

[2]

Synchronous clearing

Select counter

clearing source

[3]

Start count

[5]

Set synchronous

counter clearing

[4]

Start count

[5]

Clearing

source generation

channel?

Yes

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

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

Set synchronous

operation

Figure 14.11 Example of Synchronous Operation Setting Procedure

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