DSPIC33FJ64GS406 datasheet(261/456 Pages) MICROCHIP

261 / 456 page

 2009-2012 Microchip Technology Inc.

DS70591E-page 261

dsPIC33FJ32GS406/606/608/610 and dsPIC33FJ64GS406/606/608/610

18.0 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 can be serial EEPROMs, shift

registers, display drivers, Analog-to-Digital Converters

and so on. The SPI module is compatible with SPI and

SIOP from Motorola®.

The 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 18-1:

SPI MODULE BLOCK DIAGRAM

Note 1: This data sheet summarizes the features

of the dsPIC33FJ32GS406/606/608/

610 and dsPIC33FJ64GS406/606/608/

610 families 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) in the “dsPIC33F/PIC24H

Family Reference Manual”, which is

available from the Microchip web site

(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(1)

SCKx

bit 0

Shift Control

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

Note 1: The SPI1 module can be connected to the SS1 or ASS1 pins, which are controlled by clearing or setting the

ALTSS1 bit in the FPOR Configuration register. See Section 24.0 “Special Features” for more information.

SPIxSR

Edge

Select

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