HD6473032F16 Datasheet, PDF (386/847 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Section 10 16-Bit Integrated Timer Unit (ITU)
Sample Setup Procedure for Reset-Synchronized PWM Mode: Figure 10.31 shows a sample
procedure for setting up reset-synchronized PWM mode.
Reset-synchronized PWM mode
Stop counter
1
Select counter clock
2
Select counter clear source
3
Select reset-synchronized
PWM mode
4
Set TCNT
5
Set general registers
6
Start counter
7
1. Clear the STR3 bit in TSTR to 0 to halt
TCNT3. Reset-synchronized PWM mode
must be set up while TCNT3 is halted.
2. Set bits TPSC2 to TPSC0 in TCR to
select the counter clock source for
channel 3. If an external clock source is
selected, select the external clock
edge(s) with bits CKEG1 and CKEG0 in
TCR.
3. Set bits CCLR1 and CCLR0 in TCR3 to
select GRA3 compare match as the
counter clear source.
4. Set bits CMD1 and CMD0 in TFCR to
select reset-synchronized PWM mode.
TIOCA₃, TIOCB₃, TIOCA₄, TIOCB₄,
TOCXA₄, and TOCXB₄ automatically
become PWM output pins.
5. Preset TCNT3 to H'0000. TCNT4 need
not be preset.
6. GRA3 is the waveform period register.
Set the waveform period value in GRA3.
Set transition times of the PWM output
waveforms in GRB3, GRA4, and GRB4.
Set times within the compare match
range of TCNT3. X ≤ GRA3 (X: setting
value)
7. Set the STR3 bit in TSTR to 1 to start
TCNT3.
Reset-synchronized PWM mode
Figure 10.31 Setup Procedure for Reset-Synchronized PWM Mode (Example)
Rev. 3.00 Mar 21, 2006 page 356 of 814
REJ09B0302-0300