m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 248

• Manufacturer Part Number: m37905
• Description: Mitsubishi 16-bit Single-chip Microcomputer 7700 Family / 7900 Series
• Manufacturer: Renesas Electronics Corporation.

10.4.2 Operation in three-phase mode 1
Figure 10.4.4 shows a triangular wave modulation output example (three-phase mode 1).
Repeat procedures from
In the case of three-phase mode 1, the value of timer Ai ( i = 0 through 2) and the value of timer Ai
counted alternately. Immediately after the count start in timer Ai, however, the value of the timer Ai register
is counted twice in succession. (It is a limitation to the case immediately after the count start in timer Ai.)
At this time, the timer Ai’s one-shot pulse becomes the same length twice in succession, also. Figure
10.4.5 shows an output example at start of three-phase mode 1.
For the triangular wave modulation output model (for one period), see Figure 10.3.6.
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.
The contents of the output polarity set toggle flip-flop are reversed at each falling edge of the one-
simultaneously, the one-shot pulse outputs of timers A0 through A2 are started. Also, the contents
of the three-phase output polarity set buffer are transferred to the output polarity set toggle flip-flop,
and then, the contents of the three-phase output polarity set buffer are reversed.
shot pulse output of timer A0/A1/A2. Simultaneously, the one-shot pulse of the dead-time timer is
output.
When an underflow occurs in the timer A3 counter, a timer A3 interrupt request is generated;
through
7905 Group User’s Manual Rev.1.0
for the three-phase waveform output control.
THREE-PHASE WAVEFORM MODE
10.4 Three-phase mode 1
10-31
1
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