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8.4.5 Reset-Synchronized PWM Mode
In reset-synchronized PWM mode channels 3 and 4 are combined to produce three pairs of
complementary PWM waveforms, all having one waveform transition point in common.
When reset-synchronized PWM mode is selected TIOCA
TIOCB
, and TOCXB
4
4
counter.
Table 8-5 lists the PWM output pins. Table 8-6 summarizes the register settings.
Table 8-5 Output Pins in Reset-Synchronized PWM Mode
Channel Output Pin
3
TIOCA
3
TIOCB
3
4
TIOCA
4
TOCXA
4
TIOCB
4
TOCXB
4
Table 8-6 Register Settings in Reset-Synchronized PWM Mode
Register
Setting
TCNT3
Initially set to H'0000
TCNT4
Not used (operates independently)
GRA3
Specifies the count period of TCNT3
GRB3
Specifies a transition point of PWM waveforms output from TIOCA
GRA4
Specifies a transition point of PWM waveforms output from TIOCA
GRB4
Specifies a transition point of PWM waveforms output from TIOCB
automatically become PWM output pins, and TCNT
Description
PWM output 1
PWM output 1´ (complementary waveform to PWM output 1)
PWM output 2
PWM output 2´ (complementary waveform to PWM output 2)
PWM output 3
PWM output 3´ (complementary waveform to PWM output 3)
, TIOCB
, TIOCA
, TOCXA
3
3
4
functions as an up-
3
and TIOCB
3
and TOCXA
4
and TOCXB
4
,
4
3
4
4
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