CHAPTER 9 TIMER/COUNTER FUNCTION (REAL-TIME PULSE UNIT)
277
User’s Manual U14492EJ3V0UD
(d) When BFCMnx = 0000H is set in software processing started by INTTM0n
Figure 9-27. Operation Timing in PWM Mode 1 (Asymmetric Triangular Wave, BFCMnx = 0000H) (2)
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
0000H
0000H
0000H
0000H
a
0000H
a
0000H
0000H
0000H
INTCM0n3
INTCM0n3
Remarks 1.
n = 0, 1
2.
x = 0 to 2
3.
t: Dead time = (DTRRn + 1)/f
CLK
(f
CLK
: Base clock)
4.
The above figure shows an active high case.
Since TM0n = CM0nx = 0000H match is detected during up counting by TM0n, the F/F is just set and
does not get reset. Therefore, 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.
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 9-28 shows the change timing from the 100% duty state.
Содержание V850E/IA1 mPD703116
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