Datasheet

339

PWM mode

Select counter clock

Select waveform output level

Set TGR

Select PWM mode

Start counting

PWM mode

Select counter clear source



Figure 12.24 Procedure for Selecting the PWM Mode

PWM Mode Operation Examples—PWM Mode 1 (Figure 12.25): A TGRA register compare-

match is used as a TCNT counter clear source, the TGRA register initial output value and output

compare output value are both 0, and the TGRB register output compare output value is a 1. In this

example, the value established in the TGRA register becomes the period and the value established

in the TGRB register becomes the duty cycle.

Counter cleared by TGRA compare match

TCNT value

TGRA

TGRB

H'0000

TIOCA

Time

Figure 12.25 PWM Mode Operation Example (Mode 1)