DSP56857 datasheet(273/662 Pages) FREESCALE

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Features

Serial Peripheral Interface (SPI), Rev. 4

Freescale Semiconductor

11-3

11.1 Introduction

This section describes the Serial Peripheral Interface (SPI) module available on each chip, with

the exception for the 56855. The module allows full-duplex, synchronous, serial communication

between the Digital Signal Controllers (DSC) and peripheral devices, including other DSCs.

Software can poll SPI status flags or SPI operation can be interrupt driven. This block contains

four 16-bit memory mapped registers for control parameters, status, and data transfer.

11.2 Features

Features of the SPI module include:

•

Full-duplex operation

•

Master and slave modes

•

Double-buffered operation with separate transmit and receive registers

•

Programmable length transmissions (2 to 16 bits)

•

Programmable transmit and receive shift order (MSB first or last bit transmitted)

•

Eight master mode frequencies (maximum = bus frequency/21)

•

Maximum slave mode frequency = bus frequency

•

Clock ground for reduced Radio Frequency (RF) interference

•

Serial clock with programmable polarity and phase

•

Two separately enabled interrupts

— SPRF (SPI Receiver Full)

— SPTE (SPI Transmitter Empty)

•

Mode Fault Error flag with interrupt capability

•

Direct Memory Access (DMA) capability for both the transmitter and receiver

•

Wired OR mode functionality to enabling connection to multiple SPIs

•

Overflow Error Flag with interrupt capability

1. This frequency may be further limited by the GPIO function.

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