W83637HF Datasheet, PDF (81/149 Pages) Winbond – LPC I/O

W83637HF
FANPWM3 Output Frequency Configuration Register—Index10h (Bank 0)
Register Location:
10h
Power on Default Value
01h
Attribute:
Read Only
Size:
8 bits
7 6 5 4 32 1 0
PWM_SCALE3
PWM_CLK_SEL3
Bit 7: FANPWM3 Clock Source Select. This bit selects the clock source of FANPWM3 output
frequency.
Set to 0, select 24 MHz.
Set to 1, select 180 KHz.
Bit 6-1: FANPWM3 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
FANPWM3 Duty Cycle Select Register-- 11h (Bank 0)
Register Location:
11h
Power on Default Value
FFh
Attribute:
Read/Write
Size:
8 bits
7 6 5 4 32 1 0
PWM3_Duty
Bit 7-0: FANPWM3 duty cycle control. Write FF, duty cycle is 100%. Write 00, duty cycle is 0%.
FAN Configuration Register II -- Index 12h (Bank 0)
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Publication Release Date: June 25, 2003
Revision 1.3