DSP56855 データシートの表示（PDF） - Freescale Semiconductor

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DSP56855

16-bit Digital Signal Controllers

Freescale Semiconductor 

56855 Description

• Six (6) independent channels of DMA

• Time-of-Day (TOD)

• Up to 18 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 56855 Description

The 56855 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, creating an extremely cost-effective solution. Because of its low cost,

configuration flexibility, and compact program code, the 56855 is well-suited for many applications. The

56855 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 code for both

DSP and MCU applications. The instruction set is also highly efficient for C Compilers, enabling rapid

development of optimized control applications.

The 56855 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 56855 also provides two external

dedicated interrupt lines, and up to 18 General Purpose Input/Output (GPIO) lines, depending on

peripheral configuration.

The 56855 controller includes 24K words of Program RAM, 24K words of Data RAM and 1K of Boot

ROM. It also supports program execution from external memory.

This controller also provides a full set of standard programmable peripherals that include one Enhanced

Synchronous Serial Interface (ESSI), two Serial Communications Interfaces (SCI), and one Quad Timer.

The ESSI, SCIs, four chip selects and Quad Timer external output can be used as General Purpose

Input/Outputs when its primary function is not required.

56855 Technical Data, Rev. 6

Freescale Semiconductor

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