CHAPTER 9 TIMER/COUNTER FUNCTION (REAL-TIME PULSE UNIT)
285
User’s Manual U14492EJ3V0UD
(a) When BFCMnx > CM0n3 is set
Figure 9-32. Operation Timing in PWM Mode 2 (Sawtooth Wave, BFCMnx > CM0n3)
t
t
t
CM0n3
CM0n3
CM0n3
a
CM0nx
match
b
b
b
b
b
a
TM0n
count value
Positive phase
(TO0n0, TO0n2, TO0n4)
Negative phase
(TO0n1, TO0n3, TO0n5)
Interrupt request
BFCMnx
DTMnx
F/F
CM0nx
0000H
INTCM0n3
INTCM0n3
INTCM0n3
Set by rising edge of
TM0CEn bit
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. Since TM0n and CM0nx match does not occur, the F/F does not get reset. 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 9-33 shows the change timing from the 100% duty state.
Содержание V850E/IA1 mPD703116
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