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User’s Manual U11969EJ3V0UM00
CHAPTER 11 PWM UNIT
11.4 PWM Operations
11.4.1 Basic operations of PWM
The duty of the PWM pulse output is determined as follows by the value set to the modulo H register of the PWM
modulo register (PWMn: n = 0 to 3 ).
(Value of modulo H register)
Note 1
+ 1
Note 2
Duty of PWM pulse output =
2
x
Notes 1. 0
≤
(Value of modulo H register)
≤
2
x
- 1
2. With additional pulse
Remark
x = 4 to 8
The repeat frequency of the PWM pulse output is the frequency of the 2
x
frequency division (= f
PWMC
/2
x
) of the PWM
clock (f
PWMC
) of
φ
to
φ
/4 set by the PWM prescaler register (PWPR), and the minimum pulse width is 1/f
PWMC
.
The PWM pulse output realizes 12- to 16-bit resolution by repeatedly outputting the PWM signal with 4- to 8-bit
resolution and f
PWMC
/2
x
repeat frequency for 256 times. The PWM pulse signal with 12- to 16-bit resolution is realized
in 256 cycles by controlling the addition of the additional pulse (1/f
PWMC
) to the PWM pulse with 4- to 8-bit resolution
determined by the modulo H register according to the value of the modulo L register in 1-cycle units.
Figure 11-2. Basic Operations of PWM
Note PWM pulse: 1 cycle 4- to 8-bit resolution
PWM signal
Note
1 cycle of 12- to 16-bit PWM signal
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