SH7047 Datasheet, PDF (240/764 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTMRISC engine Family/SH7000 Series

10.4.2 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.
Example of Synchronous Operation Setting Procedure: Figure 10.11 shows an example of the
synchronous operation setting procedure.
Synchronous operation
selection
Set synchronous
operation
[1]
Synchronous presetting
Set TCNT
[2]
Synchronous clearing
Clearing
No
source generation
channel?
Yes
Select counter
clearing source
[3]
Start count
[5]
Set synchronous
counter clearing
[4]
Start count
[5]
<Synchronous presetting>
<Counter clearing>
<Synchronous clearing>
[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.
Figure 10.11 Example of Synchronous Operation Setting Procedure
Rev. 2.00, 09/04, page 200 of 720