THREE-PHASE WAVEFORM MODE
10.3 Three-phase mode 0
10.3.2 Operation in three-phase wave mode 0
Figure 10.3.4 shows a triangular wave modulation output example (three-phase mode 0), and Figure 10.3.5
shows a saw-tooth-wave modulation output example (three-phase mode 0)
➀ When an underflow occurs in the timer A3 counter, a timer A3 interrupt request is generated;
simultaneously, the one-shot pulse outputs of timer A0 through A2 are started. Also, the contents of
the output polarity set buffer of each phase are transferred to the output polarity set toggle flip-flop.
In the case of the saw-tooth-wave modulation output, the one-shot pulse of the dead-time timer is
output. Also, 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 contents of the output polarity set toggle flip-flop are reversed at each falling edge of the one
shot pulse output of timer A0/A1/A2. Simultaneously, the one-shot pulse of the dead-time timer is
output.
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 In the case of the triangular wave modulation output, before an underflow occurs in the timer A3
counter again, be sure to write the next data to the output polarity set buffer of each phase.
Repeat procedures from ➀ through ➀ for the three-phase waveform output control.
Figure 10.3.6 shows the triangular wave modulation output model (for one period), and Figure 10.3.7
shows the saw-tooth-wave modulation output model (for one period).
7906 Group User’s Manual Rev.2.0
10-21
RENESAS [ RENESAS TECHNOLOGY CORP ]
