p2125vps20 Renesas Electronics Corporation., p2125vps20 Datasheet - Page 224

• 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)
9.3.1
PWSL is used to select the input clock and the PWM data register.
Rev. 1.00 Sep. 21, 2006 Page 186 of 658
REJ09B0310-0100
Bit
7
6
5
4
Bit Name
PWCKE
PWCKS
—
—
PWM Register Select (PWSL)
Initial
Value
0
0
1
0
R/W
R/W
R/W
R
R
Description
PWM Clock Enable
PWM Clock Select
These bits, together with bits PWCKB and PWCKA in
PCSR, select the internal clock input to TCNT in the
PWM. For details, see table 9.2.
The resolution, PWM conversion period, and carrier
frequency depend on the selected internal clock, and can
be obtained from the following equations.
Resolution (minimum pulse width) = 1/internal clock
frequency
PWM conversion period = resolution × 256
Carrier frequency = 16/PWM conversion period
With a 20 MHz system clock (φ), the resolution, PWM
conversion period, and carrier frequency are as shown in
table 9.3.
Reserved
This bit is always read as 1 and cannot be modified.
Reserved
This bit is always read as 0 and cannot be modified.