W83627EHF_0611 Datasheet, PDF (49/144 Pages) Winbond – WINBOND LPC I/O

W83627EHF/EF, W83627EHG/EG
6.8.3 SYSFANOUT PWM Output Frequency Configuration Register - Index 00h (Bank 0)
Register Location:
00h
Power on Default Value:
04h
Attribute:
Read/Write
Size:
8 bits
7 6 5 43 2 1 0
PWM_SCALE1
PWM_CLK_SEL1
The register is meaningful when SYSFANOUT be programmed as PWM output.
Bit 7: SYSFANOUT PWM Input Clock Source Select. This bit selects the clock source of PWM output
frequency.
Set to 0, select 24 MHz.
Set to 1, select 180 KHz.
Bit 6-0: SYSFANOUT PWM 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.
01h : divider is 1
02h : divider is 2
03h : divider is 3
:
:
the formula is
PWM output frequency = ^{Input Clock} ∗ ¹
Pre_Scale Divider 256
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Publication Release Date: Nov. 2006
Revision 1.3