PIC17C752-08SLASHP datasheet(123/320 Pages) MICROCHIP

123 / 320 page

Preliminary

DS30264A-page 123

PIC17C75X

15.0 SYNCHRONOUS SERIAL

PORT (SSP) MODULE

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)

Refer to Application Note AN578,

"Use of the SSP

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

Figure 15-1, Figure 15-2, and Figure 15-3 show the

block diagrams for the three different modes of opera-

tion.

FIGURE 15-1: SPI MODE BLOCK

DIAGRAM

Read

Write

Internal

data bus

SSPSR reg

SSPBUF 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

Data direction bit

SMP:CKE

SDI

SDO

SCK

FIGURE 15-2: I2C SLAVE MODE BLOCK

DIAGRAM

FIGURE 15-3: I2C MASTER MODE BLOCK

DIAGRAM

Read

Write

SSPSR reg

Match detect

SSPADD reg

Start and

Stop bit detect

SSPBUF reg

Internal

data bus

Addr Match

Set, Reset

S, P bits

(SSPSTAT reg)

SCL

shift

clock

MSb

LSb

SDA

Read

Write

SSPSR reg

Match detect

SSPADD reg

Start and Stop bit

detect / generate

SSPBUF reg

Internal

data bus

Addr Match

Set/Clear S bit

Clear/Set P, bits

(SSPSTAT reg)

SCL

shift

clock

MSb

LSb

SDA

Baud Rate Generator

SSPADD<6:0>

and

and Set SSPIF

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