Synchronizing Mode - Hitachi SH7032 Hardware Manual

10.4.3

Synchronizing Mode

In synchronizing mode, two or more timer counters can be rewritten simultaneously (synchronized
preset). Multiple timer counters can also be cleared simultaneously using TCR settings
(synchronized clear). Synchronizing mode enables the general registers to be incremented with a
single time base. All five channels can be set for synchronous operation.
Procedure for Selecting Synchronizing Mode (figure 10.26):
1. Set 1 in the SYNC bit of the timer synchro register (TSNC) to use the channels in the
synchronizing mode.
2. When a value is written in TCNT in any of the synchronized channels, the same value is
simultaneously written in TCNT in the other channels.
3. Set the counter to clear with compare match/input capture using bits CCLR1 and CCLR0 in
TCR.
4. Set the counter clear source to synchronized clear using the CCLR1 and CCLR0 bits.
5. Set the STR bits in TSTR to 1 to start the TCNT count.
Select synchronizing
mode
Set synchronizing mode
Synchronized preset
Set TCNT
Synchronizing preset
Figure 10.26 Procedure for Selecting Synchronizing Mode
262
(1)
Synchronized clear
Channel that
generated clear
source?
(2)
Yes
Select counter
clear source
Start counting
Counter clear
No
(3)
Select counter
clear source
(5)
Start counting
Synchronized clear
(4)
(5)