h8s-2628 Renesas Electronics Corporation., h8s-2628 Datasheet - Page 251

• Manufacturer Part Number: h8s-2628
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

10.4.2
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 5 can all be designated for synchronous operation.
Example of Synchronous Operation Setting Procedure: Figure 10.10 shows an example of the
synchronous operation setting procedure.
[1]
[2]
[3]
[4]
[5]
<Synchronous presetting>
Synchronous Operation
Synchronous presetting
Synchronous operation
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 10.10 Example of Synchronous Operation Setting Procedure
Set synchronous
Set TCNT
operation
selection
[1]
[2]
Synchronous clearing
<Counter clearing>
source generation
clearing source
Select counter
Start count
channel?
Clearing
Yes
Section 10 16-Bit Timer Pulse Unit (TPU)
Rev. 3.00 Oct 04, 2005 page 211 of 598
No
[3]
[4]
<Synchronous clearing>
Set synchronous
counter clearing
Start count
REJ09B0155-0300
[4]
[5]