Microchip Technology MA330018 Data Sheet

© 2007-2012 Microchip Technology Inc.

DS70291G-page  239

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 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 chapters.

Note 1: This data sheet summarizes the fea-

tures of the dsPIC33FJ32MC302/304, 
dsPIC33FJ64MCX02/X04 and 
dsPIC33FJ128MCX02/X04 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

(DS70195) of the “dsPIC33F/PIC24H 
Family Reference Manual”, which is 
available from the Microchip web site 
(

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.