PIC16F87-ISLASHSS datasheet(89/214 Pages) MICROCHIP

89 / 214 page

 2003 Microchip Technology Inc.

Preliminary

DS30487B-page 87

PIC16F87/88

10.0

SYNCHRONOUS SERIAL PORT

(SSP) MODULE

10.1

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”

(DS00578).

10.2

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.

accomplish communication, typically three pins are

used:

• Serial Data Out (SDO)

RB2/SDO/RX/DT

• Serial Data In (SDI)

RB1/SDI/SDA

• Serial Clock (SCK)

RB4/SCK/SCL

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

mode of operation:

• Slave Select (SS)

RB5/SS/TX/CK

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 the SSPSTAT register (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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