H8SSLASH2214 datasheet(459/936 Pages) RENESAS

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Section 10 16-Bit Timer Pulse Unit (TPU)

Rev.4.00 Sep. 18, 2008 Page 399 of 872

REJ09B0189-0400

10.4.3

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 2 can all be designated for synchronous operation.

(1) Example of Synchronous Operation Setting Procedure

Figure 10.14 shows an example of the synchronous operation setting procedure.

Set synchronous

operation

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

sourcegeneration

channel?

Yes

[1]

[2]

[3]

[4]

[5]

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

operation.

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.

Use bits CCLR2 to CCLR0 in TCR to specify TCNT clearing by input capture/output compare,

etc.

Use bits CCLR2 to CCLR0 in TCR to designate synchronous clearing for the counter clearing

source.

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

Figure 10.14 Example of Synchronous Operation Setting Procedure

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