DSPIC33FJ12MC02ESS datasheet(183/284 Pages) MICROCHIP

183 / 284 page

Preliminary

DS70265B-page 181

dsPIC33FJ12MC201/202

17.0 INTER-INTEGRATED CIRCUIT

(I2C)

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 and 10-bit address.

•I2C Master mode supports 7 and 10-bit address.

•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.

17.1

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 address

•I2C slave operation with 10-bit address

•I2C master operation with 7- or 10-bit address

For details about the communication sequence in each

of these modes, refer to the “dsPIC33F Family

Reference Manual” . Please see the Microchip web site

(www.microchip.com) for the latest dsPIC33F Family

Reference Manual chapters.

17.2

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.

• The 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.

17.3

I2C Interrupts

The I2C module generates two interrupt flags:

• MI2CxIF (I2C Master Events Interrupt flag)

• SI2CxIF (I2C Slave Events Interrupt flag).

A separate interrupt is generated for all I2C error

conditions.

17.4

Baud Rate Generator

In I2C Master mode, the reload value for the Baud Rate

Generator (BRG) is located in the I2CxBRG register.

When the BRG is loaded with this value, the BRG

counts down to zero and stops until another reload has

taken place. If clock arbitration is taking place, for

example, the BRG is reloaded when the SCLx pin is

sampled high.

As per the I2C standard, FSCL can be 100 kHz or

400 kHz. However, the user application can specify any

baud rate up to 1 MHz. I2CxBRG values of ‘0’ or ‘1’ are

illegal.

EQUATION 17-1:

SERIAL CLOCK RATE

Note:

This data sheet summarizes the features

of the dsPIC33FJ12MC201/202 devices.

It is not intended to be a comprehensive

reference source. To complement the

information in this data sheet, refer to the

“dsPIC33F Family Reference Manual”.

Please see the Microchip web site

(www.microchip.com)

for

the

latest

dsPIC33F Family Reference Manual

chapters.

I2CxBRG =

FCY

FSCL

10,000,000

– 1

–

(

)

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