H8SLASH3021 datasheet(267/712 Pages) RENESAS

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8. 16-Bit Integrated Timer Unit (ITU)

Rev.2.00 Mar. 22, 2007 Page 243 of 684

REJ09B0352-0200

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

3, TIOCB3, TIOCA4, TOCXA4, TIOCB4,

and TOCXB

4 automatically become PWM output pins, and TCNT3 functions as an up-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

Description

TIOCA

PWM output 1

TIOCB

PWM output 1' (complementary waveform to PWM output 1)

TIOCA

PWM output 2

TOCXA

PWM output 2' (complementary waveform to PWM output 2)

TIOCB

PWM output 3

TOCXB

PWM output 3' (complementary waveform to PWM output 3)

Table 8.6

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

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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