H8SLASH3003 datasheet(359/715 Pages) RENESAS

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10.4.6 Complementary PWM Mode

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 TIOCA3, TIOCB3, TIOCA4, TOCXA4, TIOCB4,

and TOCXB4 automatically become PWM output pins, and TCNT3 and TCNT4 function as

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

Description

TIOCA3

PWM output 1

TIOCB3

PWM output 1´ (non-overlapping complementary waveform to PWM

output 1)

TIOCA4

PWM output 2

TOCXA4

PWM output 2´ (non-overlapping complementary waveform to PWM

output 2)

TIOCB4

PWM output 3

TOCXB4

PWM output 3´ (non-overlapping complementary waveform to PWM

output 3)

Table 10-8 Register Settings in Complementary PWM Mode

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 TIOCA3 and TIOCB3

GRA4

Specifies a transition point of PWM waveforms output from TIOCA4 and TOCXA4

GRB4

Specifies a transition point of PWM waveforms output from TIOCB4 and TOCXB4

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