DSP56857 datasheet(45/662 Pages) FREESCALE

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56800E Core Description

5685X Overview, Rev. 4

Freescale Semiconductor

1-13

1.4 56800E Core Description

This section provides a brief overview of the 56800E core. For a more thorough description,

please refer to the 56800E Core Reference Manual (DSP56800ERM).

1.4.1 Key Features

The 56800E architecture provides a variety of features to enhance performance, reduce

application cost, and ease product development. The architectural features making these benefits

possible include:

•

Efficient 16-bit engine with dual Harvard architecture

•

120 Million Instructions Per Second (MIPS) at 120MHz core frequency

•

Single-cycle 16

× 16-bit parallel Multiplier-Accumulator (MAC)

•

Four, 36-bit accumulators including extension bits

•

16-bit bidirectional shifter

•

Parallel instruction set with unique addressing modes

•

Hardware DO and REP loops

•

Three internal address buses and one external address bus

•

Four internal data buses and one external data bus

•

Instruction set supports both digital signal controller and controller functions

•

Four hardware interrupt levels

•

Five software interrupt levels

•

Controller-style addressing modes and instructions for compact code

•

Efficient C Compiler and local variable support

•

Software subroutine and interrupt stack with depth limited only by memory

•

JTAG/Enhanced OnCE debug programming interface

1.4.2 56800E Core Enhancements

The 56800E core architecture extends the 56800 family architecture. It is source-code compatible

with 56800 devices and adds the following new features:

•

Byte and long data types, supplementing the 56800’s word data type

•

24-bit data memory address space

•

21-bit program memory address space

•

Two additional 24-bit pointer registers

•

Two additional 36-bit accumulator registers

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