W83637HF Datasheet, PDF (73/149 Pages) Winbond – LPC I/O

FANPWM1 Duty Cycle Select Register-- 01h (Bank 0)
Register Location:
01h
Power on Default Value
FFh
Attribute:
Read/Write
Size:
8 bits
7 6 5 4 32 1 0
W83637HF
PWM1_Duty
Bit 7-0: FANPWM1 duty cycle control. Write FF, duty cycle is 100%. Write 00, duty cycle is 0%.
FANPWM2 Output Frequency Configuration Register—Index02h (Bank 0)
Register Location:
02h
Power on Default Value
01h
Attribute:
Read Only
Size:
8 bits
7 6 5 4 32 1 0
PWM_SCALE1
PWM_CLK_SEL1
Bit 7: FANPWM2 Clock Source Select. This bit selects the clock source of FANPWM2 output
frequency.
Set to 0, select 24 MHz.
Set to 1, select 180 KHz.
Bit 6-1: FANPWM2 Pre-Scale divider. This is the divider of clock source of PWM output frequency. The
maximum divider is 128 (7Fh). This divider should not be set to 0.
PWM frequency =
Pr
SourceClock
e _ scaleDivider
∗
1
256
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Publication Release Date: June 25, 2003
Revision 1.3