UPD784938 Datasheet, PDF (402/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

CHAPTER 15 PWM OUTPUT UNIT
Figure 15-7. PWM Output Timing Example 2 (PWM pulse width rewrite cycle = 2⁸/fPWMC)
1 PWM
pulse cycle
PWM
output pin
PWMn
contents
n
I
PWM
output
enabled
PWMn
rewrite
m
PWMn
rewrite
PWMn
rewrite
Cautions 1. Pulse width rewriting is performed every PWM pulse cycle.
2. The PWM pulse precision is between 8 and 12 bits.
n
PWM pulse width
switching timing
Remark l, m, and n mean the PWMn contents.
15.4 Caution
A value between 0000H and 00FFH should not be set in the PWM modulo registers (PWMn: n = 0, 1). A value between
0100H and FFFFH should be set in the PWMn. The PWM signal duty values that can be output are 17/4,096 to 4,096/
4,096.
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Preliminary User’s Manual U13987EJ1V0UM00