H8SLASH3021 datasheet(270/712 Pages) RENESAS

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8. 16-Bit Integrated Timer Unit (ITU)

Rev.2.00 Mar. 22, 2007 Page 246 of 684

REJ09B0352-0200

8.4.6

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 TIOCA

3, TIOCB3, TIOCA4, TOCXA4, TIOCB4, and

TOCXB

4 automatically become PWM output pins, and TCNT3 and TCNT4 function as up/down-

counters.

Table 8.7 lists the PWM output pins. Table 8.8 summarizes the register settings.

Table 8.7

Output Pins in Complementary PWM Mode

Channel

Output Pin

Description

TIOCA

PWM output 1

TIOCB

PWM output 1'

(non-overlapping complementary waveform to PWM output 1)

TIOCA

PWM output 2

TOCXA

PWM output 2'

(non-overlapping complementary waveform to PWM output 2)

TIOCB

PWM output 3

TOCXB

PWM output 3'

(non-overlapping complementary waveform to PWM output 3)

Table 8.8

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

3 and TIOCB3

GRA4

Specifies a transition point of PWM waveforms output from TIOCA

4 and TOCXA4

GRB4

Specifies a transition point of PWM waveforms output from TIOCB

4 and TOCXB4

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