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56800ERM Datasheet(PDF) 4 Page - Freescale Semiconductor, Inc |
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56800ERM Datasheet(HTML) 4 Page - Freescale Semiconductor, Inc |
4 / 52 page 56855 Technical Data, Rev. 6 4 Freescale Semiconductor Part 1 Overview 1.1 56855 Features 1.1.1 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 and one (1) external address bus • Four (4) internal data buses and one (1) external data bus • 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 —24K × 16-bit Program SRAM —24K × 16-bit Data SRAM —1K × 16-bit Boot ROM • Off-Chip Memory Expansion (EMI) — Access up to 2M words of program memory or 8M words of data memory — Chip Select Logic for glue-less interface to ROM and SRAM 1.1.3 Peripheral Circuits for 56855 • General Purpose 16-bit Quad Timer with 1 external pin* • Two (2) Serial Communication Interfaces (SCI)* • Enhanced Synchronous Serial Interface (ESSI) module* • Computer Operating Properly (COP)/Watchdog Timer • JTAG/Enhanced On-Chip Emulation (EOnCE) for unobtrusive, real-time debugging |
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