Renesas Hitachi H8S/2191, Hardware Manual

Page: 453 / 1065

Rev. 2.0, 11/00, page 426 of 1037
21.2 Register Descriptions
21.2.1 PWM Control Register (PWCR)
0
0
1
1
2
1
3
1
4
1
5
1
6
1
7
— — — — — — —
— — — — — — — R/W
PWCR0
1
Bit :
Initial value :
R/W :
The PWM control register (PWCR) is an 8-bit read/write register that controls the 14-bit PWM
functions. PWCR is initialized to H'FE by a reset.
Bits 7 to 1: Reserved
They are always read as 1. Writes are disabled.
Bit 0: Clock Select (PWCR0)
Selects the clock supplied to the 14-bit PWM.
Bit 0
PWCR0 Description
0 The input clock is
φ
/2 (t
φ
= 2/
φ
) (Initial value)
The conversion period is 16384/
φ
, with a minimum modulation width of 1/
φ
1 The input clock is
φ
/4 (t
φ
= 4/
φ
)
The conversion period is 32768/
φ
, with a minimum modulation width of 2/
φ
Note: t/
φ
: Period of PWM clock input