LM79 datasheet(25/31 Pages) NSC

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Functional Description (Continued)

13.2 Data Register (Port x6h)

Power on default <7:0> = 00h

Bit

Name

Read/

Write

Description

7–0

Data

Read/Write

Data to be read from or to be written to RAM and Register.

13.3 Configuration Register — Address 40h

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.

SMI Enable

Read/Write

A one enables the SMI Interrupt output.

NMI/IRQ

Enable

Read/Write

A one enables the NMI/IRQ Interrupt output.

INT__Clear

Read/Write

A one disables the SMI and NMI/IRQ 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 20 ms active low reset signal at RESET if <7> = 1 in SMI

Mask Register 2. This bit is cleared once the pulse has gone inactive.

NMI/IRQ

Select

Read/Write

A one selects NMI, and a zero selects IRQ.

Power Switch

Bypass

Read/Write

A one in this bit drives a zero on open drain Power Switch Bypass pin.

INITIALIZATION

Read/Write

A one restores power on default value to all registers except the Serial Bus Address

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