DSP56857 datasheet(35/662 Pages) FREESCALE

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5685x Family Description

5685X Overview, Rev. 4

Freescale Semiconductor

1-3

1.1 Introduction

Differing in size of memories and choice of peripherals, these multi-functional chips offer

features DSP programmers demand for executing true signal processing algorithms, flexible

user-defined, multi-level interrupt priority support, supports traditional DSP mathematical

functions for executing complicated computations, giving programmers more control in an

interrupt-driven application.

The 56853, 56854, 56855, 56857, and 56858 are members of the 56800E core-based family of

Digital Signal Controllers (DSCs). Combined on a single chip are the processing power of a DSP

and the functionality of a microcontroller with a flexible set of peripherals. The chip design

creates an extremely cost-effective and compact solution for a number of uses.

The 56800E family includes many peripherals especially well-suited for low-end Internet

appliance applications and low-end client applications, such as:

•

Telephony

•

Voice Recognition

•

Voice-Processing for Multi-Processor Systems

•

Portable Devices

•

Advanced Industrial Control

•

Internet Audio

•

Point-of-Sale Systems

•

Noise suppression

•

ID tag readers

•

Sonic/Subsonic detectors

•

Security access devices

•

Remote metering

•

Sonic alarms

1.2 5685x Family Description

The 5685x device family is based on the 56800E core and combines, on a single chip, the

processing power of a digital signal controller and the functionality of a microcontroller with a

flexible set of peripherals to create an extremely cost-effective solution. Because of its low cost,

configuration flexibility, and compact program code, each of the five devices are well-suited for

many applications.

With the exception of the 56852 chip (not included in this manual), the 5685x family includes

from 12K to 40K words of Program SRAM, 4K to 24K words of Data RAM and 1K of Boot

ROM.

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