DSPIC33FJMC202ESS datasheet(179/330 Pages) MICROCHIP

179 / 330 page

DS70283K-page 179

dsPIC33FJ32MC202/204 and dsPIC33FJ16MC304

17.0 SERIAL PERIPHERAL

INTERFACE (SPI)

The Serial Peripheral Interface (SPI) module is a syn-

chronous serial interface useful for communicating with

other peripheral or microcontroller devices. These

peripheral devices can be serial EEPROMs, shift regis-

ters, display drivers, analog-to-digital converters, 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 these four pins:

• SDIx (serial data input)

• SDOx (serial data output)

• SCKx (shift clock input or output)

• SSx (active-low slave select)

In Master mode operation, SCK is a clock output. In

Slave mode, it is a clock input.

FIGURE 17-1:

SPI MODULE BLOCK DIAGRAM

Note 1: This data sheet summarizes the features

of the dsPIC33FJ32MC202/204 and

dsPIC33FJ16MC304 family of devices. 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) of the

“dsPIC33F/PIC24H Family Reference

Manual”, which is available on the

Microchip website (www.microchip.com).

2: Some registers and associated bits

described in this section may not be

available on all devices. Refer to

Section 4.0 “Memory Organization” in

this data sheet for device-specific register

and bit information.

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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