Hitachi H8/3048 Hardware Manual page 364

10.4.5 Reset-Synchronized PWM Mode
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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 automatically become PWM output pins, and TCNT3 functions as an up-
4 4
counter.
Table 10-5 lists the PWM output pins. Table 10-6 summarizes the register settings.
Table 10-5 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 10-6 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
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)
352
, TIOCB , TIOCA , TOCXA
3 3 4
and TIOCB
3
and TOCXA
4
and TOCXB
4
,
4
3
4
4