p2125vps20 Renesas Electronics Corporation., p2125vps20 Datasheet - Page 226

• 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)
Table 9.3
9.3.2
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. PWDR0 to
PWDR15 are initialized to H’00.
Rev. 1.00 Sep. 21, 2006 Page 188 of 658
REJ09B0310-0100
Internal Clock
Frequency
φ
φ/2
φ/4
φ/8
φ/16
PWM Data Registers (PWDR0 to PWDR15)
Resolution, PWM Conversion Period and Carrier Frequency when φ = 20 MHz
Resolution
50 ns
100 ns
200 ns
400 ns
800 ns
PWM Conversion
Period
12.8 µs
25.6 µs
51.2 µs
102.4 µs
204.8 µs
Carrier Frequency
1250 kHz
625 kHz
312.5 kHz
156.3 kHz
78.1 kHz