64GA106 datasheet(175/330 Pages) MICROCHIP

175 / 330 page

 2010 Microchip Technology Inc.

DS39905E-page 175

PIC24FJ256GA110 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. All devices of the PIC24FJ256GA110 family

include three SPI modules

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.

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, SPI2 or SPI3. Special Function

Registers will follow a similar notation. For

example, SPIxCON1 and SPIxCON2

refer to the control registers for any of the

3 SPI modules.

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