NEC UPD703116 User Manual page 342

CHAPTER 9 TIMER/COUNTER FUNCTION
(a) Caution for PWM output change timing
If the SWFEn bit is changed from 1 to 0 when the timer is operating while the internal PWM output
operation is being performed, then the output level becomes active. After that, PWM output from the
TO2n pin is performed upon a compare match at subchannel n. However, the first PWM output change
timing varies as follows, depending on the internal output level and the SWFEn bit clear timing.
Figure 9-65. PWM Output Change Timing
(i) Example 1
Internal output level
SWFEn bit
TO2n output
(ALVEn bit = 1)
PWM output change timing
(ii) Example 2
Internal output level
SWFEn bit
TO2n output
(ALVEn bit = 1)
PWM output change timing
Remark n = 1 to 4
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User's Manual U14492EJ5V0UD