PIC16F631 datasheet(177/294 Pages) MICROCHIP

177 / 294 page

DS41262D-page 175

PIC16F631/677/685/687/689/690

13.0

SSP MODULE OVERVIEW

The Synchronous Serial Port (SSP) module is a serial

interface used to communicate with other peripheral 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

™)

Refer to Application Note AN578, “Use of the SSP

Module in the Multi-Master Environment” (DS00578).

13.1

SPI Mode

This section contains register definitions and operational

characteristics of the SPI module.

The 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)

FIGURE 13-1:

SSP BLOCK DIAGRAM

(SPI MODE)

Note 1: When the SPI is in Slave mode with SS

pin control enabled (SSPM<3:0> bits of

the SSPCON register = 0100), the SPI

module will reset if the SS pin is set to

VDD.

2: If the SPI is used in Slave mode with

CKE = 1, then the SS pin control must be

enabled.

3: When the SPI is in Slave mode with SS

pin control enabled (SSPM<3:0> bits of

the SSPCON register = 0100), the state

of the SS pin can affect the state read

back

from

the

TRISC<4>

bit.

The

peripheral OE signal from the SSP

module into PORTC controls the state that

is read back from the TRISC<4> bit (see

Section 17.0

“Electrical

Specifications”

for

information

PORTC). If read-write-modify instructions,

such as BSF, are performed on the

TRISC register while the SS pin is high,

this will cause the TRISC<7> bit to be set,

thus disabling the SDO output.

Read

Write

Internal

Data Bus

SCK/

SSPSR Reg

SSPBUF Reg

SSPM<3:0>

bit 0

Shift

Clock

SS Control

Enable

Edge

Select

Clock Select

TMR2 Output

TCY

Prescaler

4, 16, 64

TRISB<6>

Edge

Select

SCL

Peripheral OE

SDI/SDA

SDO

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