PIC16F72SLASHML datasheet(45/136 Pages) MICROCHIP

45 / 136 page

 2002 Microchip Technology Inc.

DS39597B-page 43

PIC16F72

9.0

SYNCHRONOUS SERIAL PORT

(SSP) MODULE

9.1

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, dis-

play 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 informa-

tion on the SSP module can be found in the PICmicro™

Mid-Range

MCU

Family

Reference

Manual

(DS33023).

Refer to Application Note AN578, “Use of the SSP

Module in the I 2C Multi-Master Environment.”

9.2

SPI Mode

This

section

contains

definitions

and

operational characteristics of the SPI module.

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)

RC5/SDO

• Serial Data In (SDI)

RC4/SDI/SDA

• Serial Clock (SCK)

RC3/SCK/SCL

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

mode of operation:

• Slave Select (SS)

RA5/AN4/SS

When initializing the SPI, several options need to be

specified. This is done by programming the appropriate

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

and SSPSTAT<7:6>. 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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