H8SSLASH2218 datasheet(355/750 Pages) RENESAS

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Section 9 16-Bit Timer Pulse Unit (TPU)

Rev.6.00 Jun. 03, 2008 Page 307 of 698

REJ09B0074-0600

9.5.2

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 2 can

all be designated for synchronous operation.

Example of Synchronous Operation Setting Procedure: Figure 9.14 shows an example of the

synchronous operation setting procedure.

Yes

Synchronous operation

selection

Set synchronous

operation

Synchronous presetting

Set TCNT

Synchronous clearing

Clearing

source generation

channel?

Select counter

clearing source

Start count

Set synchronous

counter clearing

Start count

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.

[1]

[2]

[3]

[4]

[5]

[1]

[3]

[5]

[4]

[5]

[2]

Figure 9.14 Example of Synchronous Operation Setting Procedure

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