Microchip Technology MA330019-2 Data Sheet

© 2007-2012 Microchip Technology Inc.

DS70292G-page 213

The Inter-Integrated Circuit (I

2

C) module provides

complete hardware support for both Slave and Multi-
Master modes of the I

2

C serial communication

standard, with a 16-bit interface. 
The I

2

C module has a 2-pin interface:

• The SCLx pin is clock.
• The SDAx pin is data. 
The I

2

C module offers the following key features:

• I

2

C interface supporting both Master and Slave 

modes of operation.

• I

2

C Slave mode supports 7-bit and 10-bit 

addressing

• I

2

C Master mode supports 7 and 10-bit 

addressing

• I

2

C Port allows bidirectional transfers between 

master and slaves.

• Serial clock synchronization for I

2

C port can be 

used as a handshake mechanism to suspend and 
resume serial transfer (SCLREL control).

• I

2

C supports multi-master operation, detects bus 

collision and arbitrates accordingly.

The hardware fully implements all the master and slave
functions of the I

2

C Standard and Fast mode

specifications, as well as 7 and 10-bit addressing.
The I

2

C module can operate either as a slave or a

master on an I

2

C bus.

The following types of I

2

C operation are supported:

• I

2

C slave operation with 7-bit addressing

• I

2

C slave operation with 10-bit addressing

• I

2

C master operation with 7-bit or 10-bit addressing

For details about the communication sequence in each
of these modes, refer to the “dsPIC33F/PIC24H Family
Reference Manual”. Please see the Microchip website
(

www.microchip.com

) for the latest dsPIC33F/PIC24H

Family Reference Manual chapters.

Note 1: This data sheet summarizes the features

of the dsPIC33FJ32GP302/304,
dsPIC33FJ64GPX02/X04, and
dsPIC33FJ128GPX02/X04 families of
devices. It is not intended to be a compre-
hensive reference source. To comple-
ment the information in this data sheet,
refer to Section 19. “Inter-Integrated
Circuit™ (I

C™)” (DS70195) of the

“dsPIC33F/PIC24H Family Reference
Manual”, which is available from the
Microchip website (

www.microchip.com

).

2: Some registers and associated bits

described in this section may not be
available on all devices. Refer to

 in

this data sheet for device-specific register
and bit information.