Datasheet
© 2007-2012 Microchip Technology Inc. DS70293G-page 185
PIC24HJ32GP302/304, PIC24HJ64GPX02/X04 AND PIC24HJ128GPX02/X04
17.0 INTER-INTEGRATED
CIRCUIT™ (I
2
C™)
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
17.1 Operating Modes
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 chapters.
Note 1: This data sheet summarizes the features
of the PIC24HJ32GP302/304,
PIC24HJ64GPX02/X04 and
PIC24HJ128GPX02/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
2
C™)” (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
Section 4.0 “Memory Organization” in
this data sheet for device-specific register
and bit information.