DSPIC33FJ32GS608 datasheet(259/416 Pages) MICROCHIP

259 / 416 page

 2009 Microchip Technology Inc.

Preliminary

DS70591B-page 259

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), used for shifting data in and out,

and a buffer register, SPIxBUF. A control register,

SPIxCON, configures the module. Additionally, a

STATUS

SPIxSTAT,

indicates

status

conditions.

The serial interface consists of 4 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 Refer-

ence 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 avail-

able 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

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

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.

dsPIC33FJ32GS608 Datasheet(PDF) 259 Page - Microchip Technology

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