48GA004 datasheet(141/268 Pages) MICROCHIP

141 / 268 page

 2010 Microchip Technology Inc.

DS39881D-page 141

PIC24FJ64GA004 FAMILY

15.0

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 reg-

isters, display drivers, A/D Converters, etc. The SPI

module is compatible with Motorola’s SPI and SIOP

interfaces.

The module supports operation in two buffer modes. In

Standard mode, data is shifted through a single serial

buffer. In Enhanced Buffer mode, data is shifted

through an 8-level FIFO buffer.

The module also supports a basic framed SPI protocol

while operating in either Master or Slave mode. A total

of four framed SPI configurations are supported.

The SPI serial interface consists of four pins:

• SDIx: Serial Data Input

• SDOx: Serial Data Output

• SCKx: Shift Clock Input or Output

• SSx: Active-Low Slave Select or Frame

Synchronization I/O Pulse

The SPI module can be configured to operate using 2,

3 or 4 pins. In the 3-pin mode, SSx is not used. In the

2-pin mode, both SDOx and SSx are not used.

Block diagrams of the module in Standard and

Enhanced modes are shown in Figure 15-1 and

Figure 15-2.

Depending on the pin count, devices of the

PIC24FJ64GA004 family offer one or two SPI modules

on a single device.

Note:

This data sheet summarizes the features

of this group of PIC24F devices. It is not

intended to be a comprehensive reference

source. For more information, refer to the

“PIC24F

Family

Reference

Manual”

”Section 23. Serial Peripheral Interface

(SPI)”

(DS39699)

Note:

Do not perform read-modify-write opera-

tions (such as bit-oriented instructions) on

the SPIxBUF register in either Standard or

Enhanced Buffer mode.

Note:

In this section, the SPI modules are

referred to together as SPIx or separately

as SPI1 and SPI2. Special Function Reg-

isters will follow a similar notation. For

example, SPIxCON1 or SPIxCON2 refers

to the control register for the SPI1 or SPI2

module.

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