Section 8
8-Bit PWM Timer (PWMU)
Rev. 1.00 Apr. 28, 2008 Page 207 of 994
REJ09B0452-0100
8.3.5
PWM Prescaler Registers 0 to 5 (PWMPRE0 to PWMPRE5)
PWMPRE are 8-bit readable/writable registers used to set the PWM cycle. The initial value is
H'00.
When the PWMPRE value is n, the PWM cycle is calculated as follows.
(1) 8-Bit Single Pulse Mode
PWM cycle = [255
×
(n + 1)] / internal clock frequency (0
≤
n
≤
255)
Table 8.3
Resolution, PWM Conversion Period, and Carrier Frequency (8-Bit Counter
Operation) when
φ
= 20 MHz
Carrier Frequency
PWM Conversion Period
Single Pulse Mode
Internal Clock
Frequency
Resolution
Min. Max. Min. Max.
φ
50
ns
12.8
µ
s
3.3 ms
306.4 Hz
78.4 kHz
φ
/2 100
ns
25.5
µ
s
6.5 ms
153.2 Hz
39.2 kHz
φ
/4 200
ns
51.2
µ
s
13.1 ms
76.6 Hz
19.6 kHz
φ
/8 400
ns
102
µ
s
26.1 ms
38.3 Hz
9.8 kHz
Содержание H8S/2100 Series
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