Section 8 8-Bit PWM Timer (PWMU)
Rev. 1.00 Apr. 28, 2008 Page 216 of 994
REJ09B0452-0100
(1) Example
of
Setting
: Position of additional pulse
1 conversion period
A duty cycle of 0/256 to 255/256 is output as a low-ripple waveform by combining basic pulses and additional pulses.
Duty cycle
Basic
waveform
Additional
pulses
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
127/256
128/256
129/256
130/256
PWMREG
setting
example
H'7F
H'80
H'81
H'82
112 pulses
128 pulses
128 pulses
128 pulses
15 pulses
0 pulse
1 pulse
2 pulses
Figure 8.9 Example of WMU Setting
(2) Example of Circuit for Use as D/A Converter
The following shows an example of a circuit in which PWMU output pulses are used as a D/A
converter. When a low-pass filter is connected externally to the LSI, low-ripple analog output can
be generated. If pulse division mode is used, a D/A output with even less ripple is available.
This LSI
Low-pass filter
Reference values
Resistor:
120 k
Ω
Capacitor:
0.1
µ
F
Figure 8.10 Example of Circuit for Use as a D/A Converter
Summary of Contents for H8S/2100 Series
Page 2: ...Rev 1 00 Apr 28 2008 Page ii of xxvi...
Page 54: ...Section 1 Overview Rev 1 00 Apr 28 2008 Page 28 of 994 REJ09B0452 0100...
Page 92: ...Section 2 CPU Rev 1 00 Apr 28 2008 Page 66 of 994 REJ09B0452 0100...
Page 158: ...Section 5 Interrupt Controller Rev 1 00 Apr 28 2008 Page 132 of 994 REJ09B0452 0100...
Page 244: ...Section 8 8 Bit PWM Timer PWMU Rev 1 00 Apr 28 2008 Page 218 of 994 REJ09B0452 0100...
Page 330: ...Section 10 16 Bit Timer Pulse Unit TPU Rev 1 00 Apr 28 2008 Page 304 of 994 REJ09B0452 0100...
Page 416: ...Section 13 8 Bit Timer TMR Rev 1 00 Apr 28 2008 Page 390 of 994 REJ09B0452 0100...
Page 612: ...Section 18 I 2 C Bus Interface IIC Rev 1 00 Apr 28 2008 Page 586 of 994 REJ09B0452 0100...
Page 706: ...Section 20 LPC Interface LPC Rev 1 00 Apr 28 2008 Page 680 of 994 REJ09B0452 0100...
Page 752: ...Section 21 FSI Interface Rev 1 00 Apr 28 2008 Page 726 of 994 REJ09B0452 0100...
Page 774: ...Section 23 RAM Rev 1 00 Apr 28 2008 Page 748 of 994 REJ09B0452 0100...
Page 1008: ...Section 28 Electrical Characteristics Rev 1 00 Apr 28 2008 Page 982 of 994 REJ09B0452 0100...
Page 1020: ...Rev 1 00 Apr 28 2008 Page 994 of 994 REJ09B0452 0100...
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Page 1024: ...H8S 2117R Group Hardware Manual...