PIC18LF4331-ESLASHML datasheet(205/392 Pages) MICROCHIP

205 / 392 page

 2010 Microchip Technology Inc.

DS39616D-page 205

PIC18F2331/2431/4331/4431

19.0

SYNCHRONOUS SERIAL PORT

(SSP) MODULE

19.1

SSP Module Overview

The Synchronous Serial Port (SSP) module is a serial

interface useful for communicating with other periph-

eral or microcontroller devices. These peripheral

devices may be serial EEPROMs, shift registers,

display drivers, A/D Converters, etc. The SSP module

can operate in one of two modes:

• Serial Peripheral Interface (SPI)

• Inter-Integrated Circuit (I2C™)

An overview of I2C operations and additional

information on the SSP module can be found in the

“PIC® Mid-Range MCU Family Reference Manual”

(DS33023).

Refer to application note AN578, “Use of the SSP

Module in the I 2C

™ Multi-Master Environment”

(DS00578).

19.2

SPI Mode

This section contains register definitions and opera-

tional characteristics of the SPI module. Additional

information on the SPI module can be found in the

”PIC® Mid-Range MCU Family Reference Manual”

(DS33023).

SPI mode allows 8 bits of data to be synchronously

transmitted and received simultaneously. To accomplish

communication, typically three pins are used:

• Serial Data Out (SDO)

• Serial Data In (SDI)

• Serial Clock (SCK)

Additionally, a fourth pin may be used when in a Slave

mode of operation:

• Slave Select (SS)

When initializing the SPI, several options need to be

specified. This is done by programming the appropriate

control bits in the SSPCON (SSPCON<5:0>) and

SSPSTAT<7:6> registers. These control bits allow the

following to be specified:

• Master mode (SCK is the clock output)

• Slave mode (SCK is the clock input)

• Clock polarity (Idle state of SCK)

• Clock edge (output data on rising/falling edge of

SCK)

• Clock rate (Master mode only)

• Slave Select mode (Slave mode only)

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