THREE-PHASE WAVEFORM MODE
10.5 Three-phase waveform output fixation
10.5 Three-phase waveform output fixation
In the three-phase waveform output, by setting of the U/V/W-phase output fix bit (bits 2 through 0 at address
A816) to “1,” the output level of each phase can be fixed. The output level to be fixed (positive phase) is set
by the U/V/W-phase fixed output’s polarity set bit (bits 2 through 0 at address A916); in the case of the
negative phase, the output level is fixed to the reversed level.
The U/V/W-phase output fix bit serves synchronously with a timer A3 interrupt request.
While the fixed level is output, be sure not to change the value of the U/V/W-phase fixed output’s polarity
set bit (bits 2 through 0 at address A916).
Figure 10.5.1 shows a triangular wave modulation output example using the U/V/W-phase output fix bit
(three-phase mode 1).
➀ By software, set the following bits:
• the U/V/W-phase output fix bit (bits 2 through 0 at address A816
)
• the U/V/W-phase fixed output’s polarity set bit (bits 2 through 0 at address A916
)
➀ The contents of the above bits become valid synchronously with the next timer A3 interrupt request, and
then, the output level of the positive waveform is fixed to the level which was set by the U/V/W-phase
fixed output’s polarity set bit. In the case of the negative phase, the output level is fixed to the reversed
level.
➀ Each of the positive and negative waveform outputs is not allowed to become “L” level from “H” level
until the reversed signal of the one-shot pulse output of the dead-time timer rises.
➀ The output fixation is also terminated synchronous with a timer A3 interrupt request.
7906 Group User’s Manual Rev.2.0
10-33
RENESAS [ RENESAS TECHNOLOGY CORP ]
