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 2000 Microchip Technology Inc.Preliminary DS00735A-page 1

INTRODUCTION

This application note describes the implementation of

the PICmicro MSSP module for Master I2C communi-

cations. The Master Synchronous Serial Port (MSSP)

module is the enhanced Synchronous Serial Port

developed by Microchip Technology and is featured on

many of the PICmicro devices. This module provides

for both the 4-mode SPI communications, as well as

Master and Slave I2C communications, in hardware.

For information on the SPITMperipheral implementation

see the PICmicroTM Mid-Range MCU Family Reference

Manual, document DS33023. The MSSP module in I

2C

mode fully implements all Master and Slave functions

(including general call support) and provides interrupts

on START and STOP bits in hardware to determine a

free I2C bus (multi-master function). The MSSP module

implements the standard mode specifications, as well

as 7-bit and 10-bit addressing. Figure 1 depicts a func-

tional block diagram of the I2C Master mode. The appli-

cation code for this I2C example is developed for and

tested on a PIC16F873, but can be ported over to a

PIC17CXXX and PIC18CXXX PICmicro MCU which

features a MSSP module.

FIGURE 1: I2C MASTER MODE BLOCK DIAGRAM

Author:Richard L. Fischer

Microchip Technology Inc.

Read Write

SSPSR

START bit, STOP bit,

SSPBUF

Internal

Data Bus

Set/Reset, S, P, WCOL (SSPSTAT)

Shift

Clock

MSb LSb

SDA

Acknowledge

Generate

SCL

SCL In

Bus Collision

SDA In

Receive Enable

Clock cntl

Clock Arbitrate/WCOL Detect

(hold off clock source)

SSPADD<6:0>

Baud

Set SSPIF, BCLIF

Reset ACKSTAT, PEN (SSPCON2)

Rate

Generator

SSPM3:SSPM0

START bit detect

STOP bit detect

Write collision detect

Clock Arbitration

State counter for

end of XMIT/RCV

AN735

Using the PICmicro®MSSP Module for Master

I2CTM Communications

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