DSP56857 View Datasheet(PDF) - Freescale Semiconductor

Part Name

Description

Manufacturer

DSP56857

16-bit Digital Signal Controllers

Freescale Semiconductor 

56857 Description

• 8-bit Parallel Host Interface*

• Time of Day

• Up to 47 GPIO

* Each peripheral I/O can be used alternately as a General Purpose I/O if not needed

1.1.4 Energy Information

• Fabricated in high-density CMOS with 3.3V, TTL-compatible digital inputs

• Wait and Stop modes available

1.2 56857 Description

The 56857 is a member of the 56800E core-based family of controllers. It combines, on a single chip, the

processing power of a Digital Signal Processor (DSP) 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, the 56857 is well-suited for many applications. The

56857 includes many peripherals that are especially useful for low-end Internet appliance applications

and low-end client applications such as telephony; portable devices; Internet audio; and point-of-sale

systems, such as noise suppression; ID tag readers; sonic/subsonic detectors; security access devices;

remote metering; sonic alarms.

The 56800E core is based on a Harvard-style architecture consisting of three execution units operating in

parallel, allowing as many as six operations per instruction cycle. The microprocessor-style programming

model and optimized instruction set allow straightforward generation of efficient, compact DSP and

control code. The instruction set is also highly efficient for C Compilers, enabling rapid development of

optimized control applications.

The 56857 supports program execution from either internal or external memories. Two data operands can

be accessed from the on-chip Data RAM per instruction cycle. The 56857 also provides two external

dedicated interrupt lines, and up to 47 General Purpose Input/Output (GPIO) lines, depending on

peripheral configuration.

The 56857 controller includes 40K words of Program RAM, 24K words of Data RAM and 1K of Boot

ROM.

This controller also provides a full set of standard programmable peripherals that include 8-bit parallel

Host Interface, Two Enhanced Synchronous Serial Interfaces (ESSI), one Serial Peripheral Interface (SPI),

two Serial Communications Interfaces (SCI), and one Quad Timer. The ESSIs, SPI, SCIs IO and Quad

Timer can be used as General Purpose Input/Outputs when its primary function is not required.

56857 Technical Data, Rev. 6

Freescale Semiconductor

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