Renesas H8S/2100 Series Hardware Manual page 237

(4) 8-Bit Pulse Division Mode
PWM cycle = [16 × (n + 1)] / internal clock frequency (0 ≤ n ≤ 255)
PWM conversion cycle = [256 × (n + 1)] / internal clock frequency (0 ≤ n ≤ 255)
Resolution, PWM Conversion Period, and Carrier Frequency when φ = 20 MHz
Table 9.9
(at 8-bit counter operation)
Internal Clock
Frequency Resolution
φ
50 ns
φ/2
100 ns
φ/4
200 ns
φ/8
400 ns
PWM Conversion Period
Min. Max.
12.8 µs
3.3ms
25.5 µs
6.6ms
51.2 µs
13.1ms
102.4 µs
26.2ms
Section 9 8-Bit PWM Timer (PWMU)
Carrier Frequency
(1/PWM cycle)
Min.
4882.8 Hz
2441.4 Hz
1220.7 Hz
610.4 Hz
Rev. 1.00 May 09, 2008 Page 211 of 954
REJ09B0462-0100
Max.
1250.0 kHz
625.0 kHz
312.5 kHz
156.3 kHz