PIC24HJ16GP304-E Datasheet, PDF (143/274 Pages) Microchip Technology – High-Performance, 16-bit Microcontrollers

PIC24HJ32GP202/204 AND PIC24HJ16GP304
16.0 INTER-INTEGRATED
CIRCUIT™ (I²C™)
Note 1: This data sheet summarizes the features
of the PIC24HJ32GP202/204 and
PIC24HJ16GP304 family of devices.
However, it is not intended to be a com-
prehensive reference source. To comple-
ment the information in this data sheet,
refer to “Section 19. Inter-Integrated
Circuit™ (I²C™)” (DS70195) of the
“dsPIC33Fj/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
Section 4.0 “Memory Organization” in
this data sheet for device-specific register
and bit information.
The Inter-Integrated Circuit (I²C) module provides
complete hardware support for both Slave and
Multi-Master modes of the I²C serial communication
standard, with a 16-bit interface.
The I²C module has a 2-pin interface:
• The SCLx pin is clock
• The SDAx pin is data.
The I²C module offers the following key features:
• I²C interface supporting both Master and Slave
modes of operation
• I²C Slave mode supports 7-bit and 10-bit
addressing
• I²C Master mode supports 7-bit and 10-bit
addressing
• I²C port allows bidirectional transfers between
master and slaves
• Serial clock synchronization for I²C port can be
used as a handshake mechanism to suspend and
resume serial transfer (SCLREL control)
• I²C supports multi-master operation, detects bus
collision and arbitrates accordingly
16.1 Operating Modes
The hardware fully implements all the master and slave
functions of the I²C Standard and Fast mode
specifications, as well as 7 and 10-bit addressing.
The I²C module can operate either as a slave or a
master on an I²C bus.
The following types of I²C operation are supported:
• I²C slave operation with 7-bit addressing
• I²C slave operation with 10-bit addressing
• I²C 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”.
16.2 I²C Registers
I2CxCON and I2CxSTAT are control and status
registers, respectively. The I2CxCON register is
readable and writable. The lower six bits of I2CxSTAT
are read-only. The remaining bits of the I2CSTAT are
read/write.
• I2CxRSR is the shift register used for shifting data
• I2CxRCV is the receive buffer and the register to
which data bytes are written, or from which data
bytes are read
• I2CxTRN is the transmit register to which bytes
are written during a transmit operation
• The I2CxADD register holds the slave address
• A status bit, ADD10, indicates 10-bit Address
mode
• I2CxBRG acts as the Baud Rate Generator
(BRG) reload value
In receive operations, I2CxRSR and I2CxRCV together
form a double-buffered receiver. When I2CxRSR
receives a complete byte, it is transferred to I2CxRCV,
and an interrupt pulse is generated.
© 2007-2011 Microchip Technology Inc.
DS70289H-page 143