DVR datasheet(221/416 Pages) MICROCHIP

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DS30010118D-page 221

PIC24FJ256GA705 FAMILY

18.0 INTER-INTEGRATED CIRCUIT

(I2C)

The Inter-Integrated Circuit (I2C) module is a serial

interface useful for communicating with other periph-

eral or microcontroller devices. These peripheral

devices may be serial EEPROMs, display drivers, A/D

Converters, etc.

The I2C module supports these features:

• Independent Master and Slave Logic

• 7-Bit and 10-Bit Device Addresses

• General Call Address as Defined in the

I2C Protocol

• Clock Stretching to Provide Delays for the

Processor to Respond to a Slave Data Request

• Both 100 kHz and 400 kHz Bus Specifications

• Configurable Address Masking

• Multi-Master modes to Prevent Loss of Messages

in Arbitration

• Bus Repeater mode, Allowing the Acceptance of All

Messages as a Slave, regardless of the Address

• Automatic SCL

A block diagram of the module is shown in Figure 18-1.

18.1

Communicating as a Master in a

Single Master Environment

The details of sending a message in Master mode

depends on the communications protocol for the device

being communicated with. Typically, the sequence of

events is as follows:

Assert a Start condition on SDAx and SCLx.

Send the I2C device address byte to the slave

with a write indication.

Wait for and verify an Acknowledge from the

slave.

Send the first data byte (sometimes known as

the command) to the slave.

Wait for and verify an Acknowledge from the

slave.

Send the serial memory address low byte to the

slave.

Repeat Steps 4 and 5 until all data bytes are

sent.

Assert a Repeated Start condition on SDAx and

SCLx.

Send the device address byte to the slave with

a read indication.

10. Wait for and verify an Acknowledge from the

slave.

11. Enable master reception to receive serial

memory data.

12. Generate an ACK or NACK condition at the end

of a received byte of data.

13. Generate a Stop condition on SDAx and SCLx.

Note:

This data sheet summarizes the features

of this group of PIC24F devices. It is not

intended to be a comprehensive reference

source. For more information, refer to

the “dsPIC33/PIC24 Family Reference

Manual”, “Inter-Integrated Circuit (I2C)”

(DS70000195), which is available from the

Microchip website (www.microchip.com).

The information in this data sheet

supersedes the information in the FRM.

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