7906 datasheet(240/531 Pages) RENESAS

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THREE-PHASE WAVEFORM MODE

7906 Group User’s Manual Rev.2.0

10-35

10.6 Position-data-retain function

This function is used to retain the position data synchronously with the three-phase waveform output; and

there are three position-data input pins for the U, V, and W phases.

A trigger to retain the position data (hereafter, this trigger is referred to as “retain trigger.”) can be selected

by the retain-trigger polarity select bit (bit 3 at address AA16); this bits selects the falling edge of each

positive phase or rising edge of one.

10.6.1 Operation of position-data-retain function

Figure 10.6.1 shows a usage example of the position-data-retain function (U phase) when a retain trigger

is the falling edge of the positive signal.

➀ At the falling edge of the U-phase waveform output, the state at pin IDU is transferred to the U-phase

position data retain bit (bit 2 at address AA16).

➁ Until the next falling edge of the U-phase waveform output, the above value is retained.

Fig. 10.6.1 Usage example of position-data-retain function (U phase)

10.6 Position-data-retain function

Carrier wave

Pin IDU

Transferred

U-phase position data retain bit

(bit 2 at address AA16)

Transferred

➀

➁

U-phase waveform output

Note: The retain trigger is the falling edge of the positive signal.

7906 Datasheet(PDF) 240 Page - Renesas Technology Corp