CHAPTER 9 TIMER/COUNTER FUNCTION (REAL-TIME PULSE UNIT)
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User’s Manual U14492EJ3V0UD
(b) When BFCMnx > CM0n3 is set in software processing started by INTTM0n
Figure 9-23. Operation Timing in PWM Mode 1 (Asymmetric Triangular Wave, BFCMnx > CM0n3)
t
CM0n3
CM0n3
a
CM0nx
match
INTTM0n
INTTM0n
TM0n
count value
Positive phase
(TO0n0, TO0n2, TO0n4)
Negative phase
(TO0n1, TO0n3, TO0n5)
BFCMnx
DTMnx
F/F
Interrupt request
CM0nx
0000H
b
b
b
b
a
b
a
b
b
b
INTCM0n3
INTCM0n3
Remarks 1.
n = 0, 1
2.
x = 0 to 2
3.
b > CM0n3
4.
t: Dead time = (DTRRn + 1)/f
CLK
(f
CLK
: Base clock)
5.
The above figure shows an active high case.
When a value greater than CM0n3 is set to BFCMnx, the positive phase side (TO0n0, TO0n2, TO0n4
pins) outputs a high level, and the negative phase side (TO0n1, TO0n3, TO0n5 pins) continues to output
a low level. This feature is effective for outputting a low-level or high-level width exceeding the PWM
cycle in an application such as inverter control.
The above explanation applies to an active high case. In an active low case, the levels of positive and
negative phases are merely inverted and other operations remain the same.
Figure 9-24 shows the change timing from the 100% duty state.
Содержание V850E/IA1 mPD703116
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