PIC18F4550ESOSQTP datasheet(195/430 Pages) MICROCHIP

195 / 430 page

Preliminary

DS39632D-page 193

PIC18F2455/2550/4455/4550

19.0

MASTER SYNCHRONOUS

SERIAL PORT (MSSP)

MODULE

19.1

Master SSP (MSSP) Module

Overview

The Master Synchronous Serial Port (MSSP) module is

a serial interface, useful for communicating with other

peripheral or microcontroller devices. These peripheral

devices may be serial EEPROMs, shift registers,

display drivers, A/D converters, etc. The MSSP module

can operate in one of two modes:

• Serial Peripheral Interface (SPI)

• Inter-Integrated Circuit (I2C™)

- Full Master mode

- Slave mode (with general address call)

The I2C interface supports the following modes in

hardware:

•Master mode

• Multi-Master mode

• Slave mode

19.2

Control Registers

The MSSP module has three associated control regis-

ters. These include a status register (SSPSTAT) and

two control registers (SSPCON1 and SSPCON2). The

use of these registers and their individual Configuration

bits differ significantly depending on whether the MSSP

module is operated in SPI or I2C mode.

Additional details are provided under the individual

sections.

19.3

SPI Mode

The SPI mode allows 8 bits of data to be synchronously

transmitted and received simultaneously. All four

modes of the SPI are supported. To accomplish

communication, typically three pins are used:

• Serial Data Out (SDO) – RC7/RX/DT/SDO

• Serial Data In (SDI) – RB0/AN12/INT0/FLT0/SDI/SDA

• Serial Clock (SCK) – RB1/AN10/INT1/SCK/SCL

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

mode of operation:

• Slave Select (SS) – RA5/AN4/SS/HLVDIN/C2OUT

Figure 19-1 shows the block diagram of the MSSP

module when operating in SPI mode.

FIGURE 19-1:

MSSP BLOCK DIAGRAM

(SPI MODE)

(

)

Read

Write

Internal

Data Bus

SSPSR reg

SSPM3:SSPM0

bit0

Shift

Clock

SS Control

Enable

Edge

Select

Clock Select

TMR2 Output

TOSC

Prescaler

4, 16, 64

Edge

Select

Data to TX/RX in SSPSR

TRIS bit

SMP:CKE

SDO

SSPBUF reg

SDI

SCK

Note:

Only those pin functions relevant to SPI

operation are shown here.

PIC18F4550ESOSQTP Datasheet(PDF) 195 Page - Microchip Technology

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