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56857 General Description

? 120 MIPS at 120MHz

? 40K x 16-bit Program SRAM

? 24K x 16-bit Data SRAM

? 1K x 16-bit Boot ROM

? Six (6) independent channels of DMA

? Two (2) Enhanced Synchronous Serial Interfaces

(ESSI)

? Two (2) Serial Communication Interfaces (SCI)

? Serial Port Interface (SPI)

? Four (4) dedicated GPIO

? 8-bit Parallel Host Interface

? General Purpose 16-bit Quad Timer

? JTAG/Enhanced On-Chip Emulation (OnCE?) for

unobtrusive, real-time debugging

? Computer Operating Properly (COP)/Watchdog Timer

? Time-of-Day (TOD)

? 100 LQFP package

? Up to 47 GPIO

1.1 56857 Features

1.1.1 Digital Signal Processing Core

? 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 (4) 36-bit accumulators including extension bits

? 16-bit bidirectional shifter

? Parallel instruction set with unique DSP addressing modes

? Hardware DO and REP loops

? Three (3) internal address buses

? Four (4) internal data buses

? Instruction set supports both DSP and controller functions

? Four (4) hardware interrupt levels

? Five (5) 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

1.1.2 Memory

? Harvard architecture permits up to three (3) simultaneous accesses to program and data memory

? On-Chip Memory

— 40K × 16-bit Program RAM

— 24K × 16-bit Data RAM

— 1K × 16-bit Boot ROM

— Chip Select Logic used as dedicated GPIO

1.1.3 Peripheral Circuits for 56857

? General Purpose 16-bit Quad Timer*

? Two Serial Communication Interfaces (SCI)*

? Serial Peripheral Interface (SPI) Port*

? Two (2) Enhanced Synchronous Serial Interface (ESSI) modules*

? Computer Operating Properly (COP)/Watchdog Timer

? JTAG/Enhanced On-Chip Emulation (OnCE) for unobtrusive, real-time debugging

? Six (6) independent channels of DMA

? 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