HD64F2168 Datasheet, PDF (300/874 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

9.4.1 PWM Setting Example
1-conversion cycle
PWDR
Basic
setting example
Duty cycle waveform
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
7F
127/256 112 pulse
Additiona
pulse
15 pulse
80
128/256 128 pulse
0 pulse
81
129/256 128 pulse
1 pulse
82
: Pulse added
130/256 128 pulse
2 pulse
Combination of the basic pulse and added pulse outputs 0/256 to 255/256 of duty cycle as low ripple waveform.
Figure 9.3 Example of PWM Setting
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.
This LSI
Resistor : 120 kΩ
Capacitor : 0.1 µF
Low pass filter
Reference value
Figure 9.4 Example when PWM is Used as D/A Converter
Rev. 3.00, 03/04, page 260 of 830