MCP47FXB2XT-EST datasheet(113/124 Pages) MICROCHIP

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DS20006368A-page 113

MCP47FXBX4/8

B.3.7

GENERAL CALL

The General Call is a method used by the master

device to communicate with all other slave devices. In

a Multi-master application, the other master devices

operate in Slave mode. The General Call address has

two documented formats. These are shown in

Figure B-11.

The I2C specification documents three 7-bit command

bytes.

The I2C specification does not allow ‘00000000’ (00h)

in the second byte. Also, ‘00000100’ and ‘00000110’

functionality is defined by the specification. Lastly, a

data byte with a ‘1’ in the LSb indicates a Hardware

General Call.

For details on the operation of the MCP47FXBX4/8’s

General Call commands, see Section 7.3 “General

Call Commands”.

FIGURE B-11:

GENERAL CALL FORMATS.

Note:

Only one General Call command per issue

of the General Call control byte. Any

additional General Call commands are

ignored and Not Acknowledged.

000

000 0

x xxx

xx 0 AP

General Call Address

Second Byte

7-bit Command

Reserved 7-bit commands (by I2C Specification – “NXP Specification # UM10204”, Rev. 03, 19 June 2007)

‘0000 011’b - Reset and Write Programmable Part of Slave Address by Hardware

‘0000 010’b - Write Programmable Part of Slave Address by Hardware

‘0000 000’b - NOT Allowed

The Following is a Hardware General Call Format

00 0

00 0 0

xx xx

xx 1 A

General Call Address

Second Byte

Master Address

xx xx

x x x AP

n Occurrences of (Data + A)

This indicates a Hardware General Call

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