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M16C/5L Group, M16C/56 Group
17.3.2.1
Three-Phase PWM Wave Output Timing Control
In three-phase mode 0, when a start trigger for timers A1, A2, and A4 is generated, the counter starts
counting the value of the TAi register (i = 1, 2, 4).
17.3.2.2
Three-Phase PWM Waveform Output Level Control
In triangular wave modulation mode, the output levels set in registers IDB0 and IDB1 are transferred
to the three-phase output shift registers by a transfer trigger. After a transfer trigger is generated, first
the value set in the IDB0 register becomes the output signal for each phase (internal signal), then at
the falling edge of one-shot pulse for timers A1, A2, and A4, followed by the values set in the IDB1
register. Consequently, the three-phase PWM output changes. Afterward, the values in registers
IDB0 and IDB1 alternately become output signals for each phase at every falling edge of the one-
shot pulse for timers A1, A2, and A4.
When the INV15 bit in the INVC1 register is 0 (dead time enabled), a phase changing from active to
nonactive changes simultaneously with output signals for each phase (internal signal), while a phase
changing from nonactive to active changes when the dead time timer stops.
A transfer trigger is generated under the following conditions:
•
The first timer B2 underflow after registers IDB0 and IDB1 are written.
•
Writing to the TB2 register when timer B2 is stopped (when the INV10 bit in the INVC1 register is
1).
•
Setting the INV07 bit in the INVC0 register to 1 (software trigger).
R01UH0127EJ0110 Rev.1.10
Sep 01, 2011
17. Three-Phase Motor Control Timer Function
Page 329 of 803
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