7906 datasheet(239/531 Pages) RENESAS

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THREE-PHASE WAVEFORM MODE

7906 Group User’s Manual Rev.2.0

10-34

10.5 Three-phase waveform output fixation

Fig. 10.5.1 Triangular wave modulation output example using U/V/W-phase output fix bit (three-phase mode 1)

➂

Rever-

sed

Rever-

sed

Carrier wave

Timer A3 interrupt request

Timer A3 underflow signal ❈2

Contents of timer A0/A1/A2

One-shot pulse output of

timer A0/A1/A2

❈2

Contents of three-phase

output polarity set buffer

Contents of output polarity

set toggle flip-flop

❈2

Reversed signal of pulse

output of dead-time timer

❈2

Positive waveform output

Negative waveform output

❈1

1/fi

✕ n1

1/fi ✕ n3

1/fi

✕ n7

Trans-

ferred

Trans-

ferred

Rever-

sed

Rever-

sed

❈1 : Written by software

❈2 : This is an internal signal, which cannot be read from the external.

fi : Count source of timer A0/A1/A2

This applies under the following conditions:

• Timer A3 interrupt request: every second time

• Timer A3 interrupt validity output: every even-numbered underflow in time A3

Contents of timer A01/A11/A21

n10

1/fi

✕ n2

1/fi

✕ n6

Transferred

Rever-

sed

Rever-

sed

Rever-

sed

Rever-

sed

Rever-

sed

Rever-

sed

Rever-

sed

Rever-

sed

1/fi

✕ n4

1/fi

✕ n5

➁

➀➃

U/V/W-phase output fix bit

U/V/W-phase fixed output’s

polarity set bit

❈1

Trans-

ferred

Trans-

ferred

❈1

Rever-

sed

Transferred

Rever-

sed

Transferred

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