MCP47CMB02 datasheet(113/124 Pages) MICROCHIP

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DS20006089B-page 113

MCP47CXBXX

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, the ‘00000100’ and

‘00000110’ functionalities are defined by the specifica-

tion. Lastly, a data byte with a ‘1’ in the LSb indicates a

“Hardware General Call”.

For details on the operation of the MCP47CXBXX

device’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.

00 0

00 0 0

xx x x

xx 0 AP

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

The Following is a “Hardware General Call” Format

00 0

00 00

xx xx

xx 1 A

General Call Address

Second Byte

Master Address

xx x x

x x x AP

n Occurrences of (Data + A)

This Indicates a “Hardware General Call”

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