Microchip Technology DM330023-2 Data Sheet

© 2007-2012 Microchip Technology Inc.

DS70283K-page 185

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-bit 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-bit 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 web site
(

www.microchip.com

) for the latest dsPIC33F/PIC24H

Family Reference Manual sections.

Note 1: This data sheet summarizes the features

of the dsPIC33FJ32MC202/204 and
dsPIC33FJ16MC304 family of devices. It
is not intended to be a comprehensive
reference source. To complement 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.