NEC UPD703116 User Manual page 269

32-bit single-chip microcontrollers

Table of Contents

(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)

Interrupt request

Positive phase

(TO0n0, TO0n2, TO0n4)

Negative phase

(TO0n1, TO0n3, TO0n5)

Remarks 1. n = 0, 1

2. x = 0 to 2

3. t: Dead time = (DTRRn + 1)/f

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.

CHAPTER 9 TIMER/COUNTER FUNCTION

: Base clock)

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