1 pwm setting example, 2 diagram of pwm used as d/a converter – Renesas H8S/2111B User Manual

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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

127/256

128/256

129/256

130/256

PWDR

setting example

H'7F

H'80

H'81

H'82

112 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 k

Ω

Capacitor : 0.1

µF

Figure 8.4 Example when PWM is Used as D/A Converter

This manual is related to the following products:

HD64F2111B