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R01UH0336EJ0102 Rev.1.02
Page 1398 of 1538
Jul 17, 2014
V850E2/PG4-L
Section 24 Peripheral Interconnection (PIC)
The following describes the operation example shown in Figure 24-13, High
Accuracy Triangle Wave PWM (U Phase Duty Cycle = 0%; UB Phase Duty
Cycle = 100%) Output Example with Dead Time (When TOL4 = 0 (Active Low)
and TOL5 = 0 (Active Low)), where duty cycles of U-phase and UB-phase
outputs change to 0% and 100%, respectively, using the timer configuration for
U phase PWM output. The output of the triangle wave PWM output function
with the dead time is active low.
1. Timer operation from the timer start to triangle wave PWM output with the
dead time is the same as the operation shown in Figure 24-10, High
Accuracy Triangle Wave PWM (U Phase Duty Cycle: 100%; UB Phase
Duty Cycle: 0%) Output Example with Dead Time (When TOL4 = 0 (Active
High) and TOL5 = 0 (Active High)). Note that, however, the PWM outputs
are active low.
2. Accordingly, the combinational circuit setting (PIC0REG20116,
PIC0REG20117 and PIC0REG20118, PIC0REG20119) should be made
so that the active low output is selected (the same level as the PWM
outputs). With this setting, variable dead time range pulses for active low
are output as FN00A (for U phase) and FN01A (for UB phase).
3. Similarly, the logical operation circuit setting (PIC0REG20302 to
PIC0REG20300 and PIC0REG20306 to PIC0REG20304) should be made
so that active low output is selected (the same level as the PWM outputs).
The pulses generated in step (2) are synthesized with the TOUT04 and
TOUT05 output waveforms, and are output as PWM for active low from
TAUB0O10 (U phase output) and TAUB0O11 (UB phase output).
Caution
If a value is set for the variable dead time range pulse width in CDR11 at the
same time as a 100% duty cycle value is set for U phase output in CDR04, the
last PWM output from TOUT04 is affected due to the functional specification.
To eliminate this influence, CDR11 must be set one period after setting
CDR04.
For details, refer to Figure 24-11, An Example of Variable Dead Time Range
Pulse Giving Influence on Triangle Wave PWM Output with Dead Time.
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