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PC87373 数据表(PDF) 111 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部件名 PC87373
功能描述  LPC SuperI/O with Glue Functions
PDF  174 Pages
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

PC87373 数据表(HTML) 111 Page - National Semiconductor (TI)

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8.0 Fan Speed Monitor (Continued)
111
www.national.com
Revision 1.1
To read the FAN_SPD data:
• Read the FMSPRL register: This reads the low byte of the FAN_SPD data and saves the high byte in a latch. In addition,
the SPD_RDY bit in the FMCSR register is cleared to 0.
• Read the FMSPRH register: This reads the high byte of the FAN_SPD data from the latch.
.
Figure 20. Fan Speed Monitor (Simplified Diagram)
FANTACH
Filter
(FMCSR, Bit 4)
OVFLOW
(FMCSR, Bit 2)
Up Counter
FMTHRH
Comparator
(FMCSR, Bit 1)
OVR_THR
Clear
Load
IRQ_EN
(FMCSR, Bit 3)
IRQ
FILTER_DIS
(FMCSR, Bit 0)
SPD_RDY
Set
32.000 KHz
THRSH
(16 bit)
(16 bit)
FAN_SPD
Divide
(FMCSR, Bit 7)
TPPR
by 2
Bits 7-0
FMTHRL
High Byte
Latch
FMSPRH
FMSPRL
Bits 15-8



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