p2125vps20 Renesas Electronics Corporation., p2125vps20 Datasheet - Page 232

• Manufacturer Part Number: p2125vps20
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 9 8-Bit PWM Timer (PWM)
9.4.1
9.4.2
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.
Rev. 1.00 Sep. 21, 2006 Page 194 of 658
REJ09B0310-0100
setting example
PWDR
H'7F
H'80
H'81
H'82
PWM Setting Example (Pulse Division System)
Diagram of PWM Used as D/A Converter
: Pulse added
Combination of the basic pulse and added pulse outputs 0/256 to 255/256 of dudty cycle as low ripple wave form.
0
1
Figure 9.4 Example when PWM is Used as D/A Converter
2
3
This LSI
4
Figure 9.3 Example of PWM Setting
5
1-conversion cycle
6
7
Resistor : 120 kΩ
8
9
Low pass filter
10
11
12
Capacitor : 0.1 µF
13
14
Reference value
15
Duty cycle
127/256
128/256
129/256
130/256
112 pulses
128 pulses
128 pulses
128 pulses
waveform
Basic
15 pulses
Additiona
0 pulses
2 pulses
1 pulse
pulse