7906 datasheet(207/531 Pages) RENESAS

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THREE-PHASE WAVEFORM MODE

7906 Group User’s Manual Rev.2.0

10-2

10.1 Overview

The three-phase waveform mode serves as follows: three-phase waveforms (3 positive waveforms and 3

negative waveforms) are output from the three-phase waveform output pins. The three-phase waveform

mode consists of “three-phase mode 0” and “three-phase mode 1.”

Table 10.1.1 lists the specifications of the three-phase waveform mode, Table 10.1.2 lists the comparison

of operations in three-phase mode 0 and 1, and Figure 10.1.1 shows the comparison of waveforms in three-

phase mode 0 and 1.

Table 10.1.1 Specifications of three-phase waveform mode

Table 10.1.2 Comparison of operations in three-phase mode 0 and 1

6 pins (U, U, V, V, W, W)

P6OUTCUT (Input of falling edge)

Three-phase mode 0 A timer A3 interrupt request occurs at each timer A3 underflow.

Three-phase mode 1

A timer A3 interrupt request occurs at each second timer A3

underflow or forth one.

Timers A0 through A2 (Used in the one-shot pulse mode)

• Timer A0 : W- and W-phase waveform control

• Timer A1 : V- and V-phase waveform control

• Timer A2 : U- and U-phase waveform control

Timer A3 (Used in the timer mode)

• Output period control

Saw-tooth-wave mo-

dulation output

Triangular wave mo-

dulation output

Fixed level output

Dead-time timer is used.

See Table 10.2.1.

Item

Specifications

Three-phase waveform output pins

Three-phase-waveform-output-

forcibly-cutoff signal input pin

Operation modes

Timer to be used

Three-phase waveform

period

Output waveform and

Output width

Dead time (width)

✕ 2 to

✕ 65535 ✕ 2 (Note)

f4096

✕ 65535 (Note)

f4096

✕ 65536

f4096

Each of the U, V, W phases is fixed to an arbitrary level.

Each of the U, V, W phases is fixed to the reversed level of the

corresponding positive phase (the U, V, W phases).

Note: This value does not include the dead time.

Each timer A3 underflow

Each timer uses one register.

• By software, the output polarity can be set to the

output polarity set buffer of the U, V, or W phases.

• If necessary, the contents of each output

polarity set buffer are reversed by software.

Three-phase mode 0

Three-phase mode 1

Timer A3 interrupt request

occurrence interval

Timers A0 through A2

Output polarity

Each second timer A3 underflow or forth

one is selected by software.

Each timer uses two registers alternately.

• By software, the output polarity can be set

to the three-phase output polarity set buffer.

• At each period, the contents of the three-

phase output polarity set buffer are reversed

by hardware.

10.1 Overview

7906 Datasheet(PDF) 207 Page - Renesas Technology Corp

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