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Functional Description (Continued)

13.0 REGISTERS AND RAM

13.1 Address Register

The main register is the ADDRESS Register. The bit designations are as follows:

Bit Name Read/

Write

Description

7-0 Address

Pointer

Write Address of RAM and Registers. See the tables below for detail.

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Address Pointer (Power On default 00h)

A7 A6 A5 A4 A3 A2 A1 A0

13.2 Address Pointer Index (A7–A0)

Registers and RAM

A6–A0 in

Hex

Power On Value of

Registers:

Notes

7:0

in Binary

Configuration Register 40h 0000 1000

Interrupt Status Register 1 41h 0000 0000

Interrupt Status Register 2 42h 0000 0000

Interrupt Mask Register 1 43h 0000 0000

Interrupt Mask Register 2 44h 0000 0000

CI Clear Register 46h 0000 0000

VID/Fan Divisor Register 47h

7:4

= 0101;

3:0

= VID3–VID0

Serial Bus Address Register 48h

7:2

=0010 11;

1:0

=(A1)(A0)

VID4 Register 49h

7:1

=1000 000;

=VID4

Temperature Configuration

4Bh 0000 0001

Extended Mode Register 1 4Ch 0100 0100

Extended Mode Register 2 4Dh 0000 0000

Value RAM 19h–3Dh Address 19h default=1111 1111

Company ID 3Eh 0000 0001 This default designates National

Semiconductor.

Stepping 3Fh 0000 0011 Revisions of this device will start with 1 and

increment by one.

LM81