PIC32MX795F512LT-80ISLASHPF datasheet(143/256 Pages) MICROCHIP

143 / 256 page

DS61156G-page 143

PIC32MX5XX/6XX/7XX

17.0 SERIAL PERIPHERAL

INTERFACE (SPI)

The SPI module is a synchronous serial interface that

is useful for communicating with external peripherals

and other microcontroller devices. These peripheral

devices may be Serial EEPROMs, Shift registers, dis-

play drivers, Analog-to-Digital Converters, etc. The

PIC32 SPI module is compatible with Motorola® SPI

and SIOP interfaces.

Following are some of the key features of this module:

• Master and Slave modes support

• Four different clock formats

• Enhanced Framed SPI protocol support

• User-configurable 8-bit, 16-bit and 32-bit data

width

• Separate SPI FIFO buffers for receive and

transmit

- FIFO buffers act as 4/8/16-level deep FIFOs

based on 32/16/8-bit data width

• Programmable interrupt event on every 8-bit,

16-bit and 32-bit data transfer

• Operation during CPU Sleep and Idle mode

• Fast bit manipulation using CLR, SET and INV

registers

FIGURE 17-1:

SPI MODULE BLOCK DIAGRAM

Note 1:

This data sheet summarizes the features

of the PIC32MX5XX/6XX/7XX family of

devices. It is not intended to be a

comprehensive reference source. To

complement the information in this data

sheet, refer to Section 23. “Serial

Peripheral Interface (SPI)”

(DS61106) in

the “PIC32 Family Reference Manual”,

which is available from the Microchip web

site (www.microchip.com/PIC32).

Some registers and associated bits

described in this section may not be

available on all devices. Refer to

Section 4.0 “Memory Organization”

this data sheet for device-specific register

and bit information.

Internal

Data Bus

SDIx

SDOx

SSx/FSYNC

SCKx

SPIxSR

bit 0

Shift

Control

Edge

Select

Enable Master Clock

Baud Rate

Slave Select

Sync Control

Clock

Control

Transmit

Receive

and Frame

Note: Access SPIxTXB and SPIxRXB FIFOs via SPIxBUF register.

FIFOs Share Address SPIxBUF

SPIxBUF

Generator

PBCLK

Write

Read

SPIxTXB FIFO

SPIxRXB FIFO

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