7906 datasheet(208/531 Pages) RENESAS

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THREE-PHASE WAVEFORM MODE

7906 Group User’s Manual Rev.2.0

10-3

10.1 Overview

Fig. 10.1.1 Comparison of waveforms in three-phase mode 0 and 1

Timer A3

underflow signal

Timer A3

interrupt request signal

Timer A2

one-shot pulse output

Phase U

Three-phase mode 0

: Triangular wave

modulation

By software at each timer A3 interrupt,

• Waveform output polarity is reversed.

• Data is written to timer A2.

Waveform output polarity is reversed

by hardware.

Three-phase mode 1

: Triangular wave

modulation

Timer A3

interrupt request signal

Timer A2

one-shot pulse output

Phase U

By software at each timer A3 interrupt,

• Data is written to timer A2 register.

• Data is written to timer A21 register.

Contets of

timer A21

Contets of

timer A2

Contets of

timer A2

Contets of

timer A21

Note: This applies when a timer A3 interrupt request occurs at each second timer A3 underflow.

Timer A3

interrupt request signal

Timer A2

one-shot pulse output

Phase U

Three-phase mode 0

: Saw-tooth-wave

modulation

By software at each timer A3 interrupt,

• Data is written to timer A2.

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