Synchronous Operation; Figure 9.11 Example Of Synchronous Operation Setting Procedure - Renesas H8SX/1520 Series Hardware Manual

9.4.2

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 9.11 shows an example of the synchronous operation setting procedure.
Synchronous operation
Synchronous presetting
<Synchronous presetting>
[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.
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selection
Set synchronous
[1]
operation
Set TCNT [2]

Figure 9.11 Example of Synchronous Operation Setting Procedure

Synchronous clearing
Clearing
No
source generation
channel?
Yes
Select counter
[3]
clearing source
Start count [5]
<Counter clearing>
Rev. 3.00 Mar. 14, 2006 Page 305 of 804
Section 9 16-Bit Timer Pulse Unit (TPU)
Set synchronous
counter clearing
Start count
<Synchronous clearing>
REJ09B0104-0300
[4]
[5]