Hitachi H8/3048 Hardware Manual page 367

10.4.6 Complementary PWM Mode
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In complementary PWM mode channels 3 and 4 are combined to output three pairs of
complementary, non-overlapping PWM waveforms.
When complementary PWM mode is selected TIOCA
and TOCXB automatically become PWM output pins, and TCNT3 and TCNT4 function as
4
up/down-counters.
Table 10-7 lists the PWM output pins. Table 10-8 summarizes the register settings.
Table 10-7 Output Pins in Complementary PWM Mode
Channel Output Pin
3 TIOCA
TIOCB
4 TIOCA
TOCXA
TIOCB
TOCXB
Table 10-8 Register Settings in Complementary PWM Mode
Register Setting
TCNT3 Initially specifies the non-overlap margin (difference to TCNT4)
TCNT4 Initially set to H'0000
GRA3 Specifies the upper limit value of TCNT3 minus 1
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
3
PWM output 1´ (non-overlapping complementary waveform to PWM
3
output 1)
PWM output 2
4
PWM output 2´ (non-overlapping complementary waveform to PWM
4
output 2)
PWM output 3
4
PWM output 3´ (non-overlapping complementary waveform to PWM
4
output 3)
, TIOCB , TIOCA
3 3
355
, TOCXA , TIOCB ,
4 4 4
and TIOCB
3 3
and TOCXA
4 4
and TOCXB
4 4