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Rev. 1.00, 05/04, page 155 of 544
8.4.1 PWM Setting Example
: Pulse added
1-conversion cycle
Combination of the basic pulse and added pulse outputs 0/256 to 255/256 of dudty cycle as low ripple wave form.
Duty cycle
Basic
waveform
Additiona
pulse
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
127/256
128/256
129/256
130/256
PWDR
setting example
H'7F
H'80
H'81
H'82
112 pulses
128 pulses
128 pulses
128 pulses
15 pulses
0 pulses
1 pulse
2 pulses
Figure 8.3 Example of PWM Setting
8.4.2 Diagram of PWM Used as D/A Converter
Figure 8.4 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
Low pass filter Reference value
Resistor : 120 kΩ
Capacitor : 0.1 µF
Figure 8.4 Example when PWM is Used as D/A Converter