DSPIC33FJ64GP706 datasheet(173/322 Pages) MICROCHIP

173 / 322 page

DS70286C-page 171

dsPIC33FJXXXGPX06/X08/X10

16.0 SERIAL PERIPHERAL

INTERFACE (SPI)

The Serial Peripheral Interface (SPI) module is a

synchronous serial interface useful for communicating

with other peripheral or microcontroller devices. These

peripheral devices may be serial EEPROMs, shift

registers, display drivers, ADC, etc. The SPI module is

compatible with SPI and SIOP from Motorola®.

Each SPI module consists of a 16-bit shift register,

SPIxSR (where x = 1 or 2), used for shifting data in and

out, and a buffer register, SPIxBUF. A control register,

SPIxCON, configures the module. Additionally, a status

The serial interface consists of 4 pins: SDIx (serial data

input), SDOx (serial data output), SCKx (shift clock input

or output), and SSx (active-low slave select).

In Master mode operation, SCK is a clock output but in

Slave mode, it is a clock input.

FIGURE 16-1:

SPI MODULE BLOCK DIAGRAM

Note:

This data sheet summarizes the features

of the dsPIC33FJXXXGPX06/X08/X10

family of devices. However, it is not

intended to be a comprehensive reference

source. To complement the information in

this data sheet, refer to Section 18.

“Serial

Peripheral

Interface

(SPI)”

(DS70206) in the “dsPIC33F Family

Reference Manual”, which is available

from

the

Microchip

web

site

(www.microchip.com).

Note:

In this section, the SPI modules are

referred to together as SPIx, or separately

as SPI1 and SPI2. Special Function

Registers will follow a similar notation. For

example, SPIxCON refers to the control

Internal Data Bus

SDIx

SDOx

SSx

SCKx

SPIxSR

bit 0

Shift Control

Edge

Select

FCY

Primary

1:1/4/16/64

Enable

Prescaler

Sync

SPIxBUF

Control

Transfer

Write SPIxBUF

Read SPIxBUF

SPIxCON1<1:0>

SPIxCON1<4:2>

Master Clock

Clock

Control

Secondary

Prescaler

1:1 to 1:8

SPIxRXB

SPIxTXB

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