Section 10 8-Bit PWM Timer (PWM)
Rev. 3.00 Jan 25, 2006 page 266 of 872
REJ09B0286-0300
Table 10.3 Resolution, PWM Conversion Period, and Carrier Frequency when
φφφφ
= 20 MHz
Internal Clock
Frequency
Resolution
PWM Conversion
Period
Carrier Frequency
φ
50 ns
12.8
µ
s
1250 kHz
φ
/2
100 ns
25.6
µ
s
625 kHz
φ
/4
200 ns
51.2
µ
s
312.5 kHz
φ
/8
400 ns
102.4
µ
s
156.3 kHz
φ
/16
800 ns
204.8
µ
s
78.1 kHz
10.3.2
PWM Data Registers (PWDR0 to PWDR15)
PWDR are 8-bit readable/writable registers. The PWM has sixteen PWM data registers. Each
PWDR specifies the duty cycle of the basic pulse to be output, and the number of additional
pulses. The value set in PWDR corresponds to a 0 or 1 ratio in the conversion period. The upper
four bits specify the duty cycle of the basic pulse as 0/16 to 15/16 with a resolution of 1/16. The
lower four bits specify how many extra pulses are to be added within the conversion period
comprising 16 basic pulses. Thus, a specification of 0/256 to 255/256 is possible for 0/1 ratios
within the conversion period. For 256/256 (100%) output, port output should be used.
10.3.3
PWM Data Polarity Registers A and B (PWDPRA and PWDPRB)
Each PWDPR selects the PWM output phase.
PWDPRA
Bit
Bit Name
Initial Value
R/W
Description
7
6
5
4
3
2
1
0
OS7
OS6
OS5
OS4
OS3
OS2
OS1
OS0
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Output Select 7 to 0
These bits select the PWM output phase. Bits OS7 to
OS0 correspond to outputs PW7 to PW0.
0: PWM direct output (PWDR value corresponds to high
width of output)
1: PWM inverted output (PWDR value corresponds to
low width of output)
Содержание H8S/2158
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Страница 440: ...Section 15 Watchdog Timer WDT Rev 3 00 Jan 25 2006 page 386 of 872 REJ09B0286 0300...
Страница 606: ...Section 17 I 2 C Bus Interface IIC Rev 3 00 Jan 25 2006 page 552 of 872 REJ09B0286 0300...
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Страница 768: ...Section 22 A D Converter Rev 3 00 Jan 25 2006 page 714 of 872 REJ09B0286 0300...
Страница 770: ...Section 23 RAM Rev 3 00 Jan 25 2006 page 716 of 872 REJ09B0286 0300...
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Страница 878: ...Section 28 List of Registers Rev 3 00 Jan 25 2006 page 824 of 872 REJ09B0286 0300...
Страница 926: ...Index Rev 3 00 Jan 25 2006 page 872 of 872 REJ09B0286 0300...