Pwm Setting Example; Diagram Of Pwm Used As D/A Converter; Figure 9.3 Example Of Pwm Setting; Figure 9.4 Example When Pwm Is Used As D/A Converter - Renesas H8S Series Hardware Manual

Section 9 8-Bit PWM Timer (PWM)
9.4.1

PWM Setting Example

PWDR
setting example
0 1 2
H'7F
H'80
H'81
H'82
: Pulse added
Combination of the basic pulse and added pulse outputs 0/256 to 255/256 of dudty cycle as low ripple wave form.
9.4.2

Diagram of PWM Used as D/A Converter

Figure 9.4 shows the diagram example when using the PWM pulse as the D/A converter. Analog
signal with low ripple can be generated by connecting the low pass filter.

Figure 9.4 Example when PWM is Used as D/A Converter

Rev. 3.00 Jul. 14, 2005 Page 256 of 986
REJ09B0098-0300
1-conversion cycle
3 4 5 6 7 8

Figure 9.3 Example of PWM Setting

Resistor : 120 kΩ
This LSI
9 10 11 12 13 14
Capacitor : 0.1 µF
Low pass filter Reference value
Basic
Duty cycle waveform
15
127/256 112 pulses
128/256 128 pulses
129/256 128 pulses
130/256 128 pulses
Additiona
pulse
15 pulses
0 pulses
1 pulse
2 pulses