LM80 datasheet(23/29 Pages) NSC

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Functional Description (Continued)

12.3 Configuration Register — Address 00h

Power on default <7:0> = 00001000 binary

Bit

Name

Read/

Write

Description

Start

Read/Write

A one enables startup of monitoring operations, a zero puts the part in standby mode.

Note: The outputs of Interrupt pins will not be cleared if the user writes a zero to this

location after an interrupt has occurred unlike “INT_Clear” bit.At start up, limit checking

functions and scanning begin. Note, all limits should be set in the Value RAM before

setting this bit HIGH.

INT Enable

Read/Write

A one enables the INT Interrupt output.

INT polarity

select

Read/Write

A one selects an active high open source output while a zero selects an active low

open drain output.

INT_Clear

Read/Write

A one disables the INT and RST_OUT/OS outputs without affecting the contents of

Interrupt Status Registers. The device will stop monitoring. It will resume upon clearing

of this bit.

RESET

Read/Write

A one outputs at least a 10 ms active low reset signal at RESET, if <7> = 1 and

<6> = 0 in the Fan Divisor/RST_OUT/OS Register. This bit is cleared once the pulse

has gone inactive.

Chassis Clear

Read/Write

A one clears the CI (Chassis Intrusion) pin. This bit clears itself after the CI pins

cleared.

GPO

Read/Write

A one in this bit drives a one on GPO (General Purpose Output) pin.

INITIALIZATION

Read/Write

A one restores power on default value to the Configuration Register, Interrupt Status

Registers, Interrupt Mask Registers, Fan Divisor/RST_OUT/OSRegister, and the OS

Configuration/Temperature Resolution Register. This bit clears itself since the power

on default is zero.

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