PIC16F737 datasheet(93/280 Pages) MICROCHIP

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DS30498D-page 93

PIC16F7X7

10.0

MASTER SYNCHRONOUS

SERIAL PORT (MSSP)

MODULE

10.1

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

10.2

Control Registers

The MSSP module has three associated registers.

These include a status register (SSPSTAT) and two

control registers (SSPCON 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.

10.3

SPI Mode

The SPI mode allows 8 bits of data to be synchronously

transmitted and received simultaneously. All four modes

of SPI are supported. 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/LVDIN/SS/C2OUT

Figure 10-1 shows the block diagram of the MSSP

module when operating in SPI mode.

FIGURE 10-1:

MSSP BLOCK DIAGRAM

(SPI MODE)

Read

Write

Internal

Data Bus

SSPSR Reg

SSPM3:SSPM0

bit 0

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

RC4/SDI/

RC5/SDO

RA5/AN4/

(

)

SSPBUF Reg

LVDIN/SS/

RC3/

SCK/

Peripheral OE

C2OUT

SDA

SCL

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