MCP47FVB01 datasheet(82/92 Pages) MICROCHIP

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MCP47FVBXX

DS20005405A-page 82

 2015 Microchip Technology Inc.

B.3.7

GENERAL CALL

The General Call is a method the “Master” device can

use to communicate with all other “Slave” devices. In a

Multi-Master application, the other Master devices are

operating 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 MCP47FVBXX’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

xxx

General Call Address

Second Byte

“7-bit Command”

Reserved 7-bit Commands (By I2C Specification – NXP specification # UM10204, Rev. 06, 4 April 2014)

‘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

0 0

General Call Address

Second Byte

“Master Address”

n occurrences of (Data + A)

This indicates a “Hardware General Call”

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