Datasheet

 2009-2012 Microchip Technology Inc. DS70594D-page 203
dsPIC33FJXXXMCX06A/X08A/X10A
19.0 INTER-INTEGRATED CIRCUIT
(I
2
C™)
The Inter-Integrated Circuit (I
2
C) module, with its 16-bit
interface, provides complete hardware support for both
Slave and Multi-Master modes of the I
2
C serial
communication standard.
The dsPIC33FJXXXMCX06A/X08A/X10A devices have
up to two I
2
C interface modules, denoted as I2C1 and
I2C2. Each I
2
C module has a 2-pin interface: the SCLx
pin is clock and the SDAx pin is data.
Each I
2
C module ‘x’ (x = 1 or 2) offers the following key
features:
•I
2
C interface supports both master and slave
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 the 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; it detects
bus collision and will arbitrate accordingly
19.1 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 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, please refer to the “dsPIC33F/PIC24H
Family Reference Manual”.
Note 1: This data sheet summarizes the features
of the dsPIC33FJXXXMCX06A/X08A/
X10A family of devices. However, it is not
intended to be a comprehensive refer-
ence source. To complement the infor-
mation in this data sheet, refer to Section
19. “Inter-Integrated Circuit (I
2
C™)”
(DS70195) in 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.