LPC47M14X datasheet(149/205 Pages) SMSC

149 / 205 page

SMSC DS – LPC47M14X

Page 149

Rev. 03/19/2001

NAME

REG OFFSET

(hex)

DESCRIPTION

Fan Control

Default = 0x50

on VTR POR

(R/W)

Fan Control Register

Bit[0] Fan 1 Clock Source Select

This bit and the Fan 1 Clock Multiplier bit is used with

The Fan 1 Clock Select bit in the Fan 1 register (0x56) to

determine the fan speed FOUT.

See Table 57

–

Different Modes for Fan in “Fan Speed Control and

Monitoring” section.

Bit[1] Fan 2 Clock Source Select

This bit and the Fan 2 Clock Multiplier bit is used with

The Fan 2 Clock Select bit in the Fan 2 register (0x57) to

determine the fan speed FOUT.

See Table 57

–

Different Modes for Fan in “Fan Speed Control and

Monitoring” section.

Bit[2] Fan 1 Clock multiplier

0=No multiplier used

1=Double the fan speed selected by bit 0 of this

Bit[3] Fan 2 Clock multiplier

0=No multiplier used

1=Double the fan speed selected by bit 1 of this

Bit[5:4] The FAN1 count divisor. Clock scalar for

adjusting the tachometer count. Default = 2.

00: divisor = 1

01: divisor = 2

10: divisor = 4

11: divisor = 8

Bit[7:6] The FAN2 count divisor. Clock scalar for

adjusting the tachometer count. Default = 2.

00: divisor = 1

01: divisor = 2

10: divisor = 4

11: divisor = 8

Fan1 Tachometer

Default = 0x00

on VTR POR

(R)

Fan Tachometer Register 1

Bit]7:0] The 8-bit FAN1 tachometer count. The number

of counts of the internal clock per pulse of the fan. The

count value is computed from Equation 1. This value is

the final (maximum) count of the previous pulse

(latched). The value in this register may not be valid for

up to 2 pulses following a write to the preload register.

Fan2 Tachometer

Default = 0x00

on VTR POR

(R)

Fan Tachometer Register 2

Bit[7:0] The 8-bit FAN2 tachometer count. The number

of counts of the internal clock per pulse of the fan. The

count value is computed from Equation 1. This value is

the final (maximum) count of the previous pulse

(latched). The value in this register may not be valid for

up to 2 pulses following a write to the preload register.

Fan1 Preload

Default = 0x00

on VTR POR

(R/W)

Fan Preload Register 1

Bit[7:0] The FAN1 tachometer preload. This is the initial

value used in the computation of the FAN1 count.

Writing this register resets the tachometer count.

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