70592C datasheet(161/314 Pages) MICROCHIP

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DS70592C-page 161

PIC24HJXXXGPX06A/X08A/X10A

16.0 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 may 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 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 1: This data sheet summarizes the features

of the PIC24HJXXXGPX06A/X08A/X10A

family of devices. However, it is not

intended to be a comprehensive refer-

ence source. To complement the infor-

mation in this data sheet, refer to the

“dsPIC33F/PIC24H Family Reference

Manual“, Section 18. “Serial Peripheral

Interface (SPI)” (DS70243), which is

available from 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.

Note:

In this section, the SPI modules are

referred to together as SPIx, or sepa-

rately as SPI1 and SPI2. Special Function

Registers will follow a similar notation.

For example, SPIxCON refers to the con-

trol register for the SPI1 or SPI2 module.

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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