THREE-PHASE WAVEFORM MODE
10.6 Position-data-retain function
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).
➀ Until the next falling edge of the U-phase waveform output, the above value is retained.
➀
➀
Carrier wave
U-phase waveform output
U-phase waveform output
Pin IDU
Transferred
Transferred
Transferred
Transferred
U-phase position data retain bit
(bit 2 at address AA16
)
Note: The retain trigger is the falling edge of the positive signal.
Fig. 10.6.1 Usage example of position-data-retain function (U phase)
7906 Group User’s Manual Rev.2.0
10-35
RENESAS [ RENESAS TECHNOLOGY CORP ]
