H8SLASH3021 datasheet(264/712 Pages) RENESAS

264 / 712 page

8. 16-Bit Integrated Timer Unit (ITU)

Rev.2.00 Mar. 22, 2007 Page 240 of 684

REJ09B0352-0200

Sample Setup Procedure for PWM Mode: Figure 8.28 shows a sample procedure for setting up

PWM mode.

PWM mode

1. Set bits TPSC2 to TPSC0 in TCR to

select the counter clock source. If an

external clock source is selected, set

bits CKEG1 and CKEG0 in TCR to

select the desired edge(s) of the

external clock signal.

PWM mode

Select counter clock

Select counter clear source

Set GRA

Set GRB

Select PWM mode

Start counter

2. Set bits CCLR1 and CCLR0 in TCR

to select the counter clear source.

3. Set the time at which the PWM

waveform should go to 1 in GRA.

4. Set the time at which the PWM

waveform should go to 0 in GRB.

5. Set the PWM bit in TMDR to select

PWM mode. When PWM mode is

selected, regardless of the TIOR

contents, GRA and GRB become

output compare registers specifying

the times at which the PWM

goes to 1 and 0. The TIOCA pin

automatically becomes the PWM

output pin. The TIOCB pin conforms

to the settings of bits IOB1 and IOB0

in TIOR. If TIOCB output is not

desired, clear both IOB1 and IOB0 to 0.

6. Set the STR bit to 1 in TSTR to start

the timer counter.

Figure 8.28 Setup Procedure for PWM Mode (Example)

H8/3021 Datasheet(PDF) 264 Page - Renesas Technology Corp