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