Freescale MC56F8257数字信号控制器开发方案

作者：时间：2012-10-22来源：网络收藏

• Clock sources

— On-chip relaxation oscillator with two user selectable frequencies: 400 kHz for low speed mode, 8 MHz for normal operation

— External clock: crystal oscillator, ceramic resonator, and external clock source

• Cyclic Redundancy Check (CRC) Generator

— Hardware CRC generator circuit using 16-bit shift register

— CRC16-CCITT compliancy with x16 + x12 + x5 + 1 polynomial

— Error detection for all single, double, odd, and most multi-bit errors

— Programmable initial seed value

— High-speed hardware CRC calculation

— Optional feature to transpose input data and CRC result via transpose register, required on applications where bytes are in LSb (Least Significant bit) format.

• Up to 54 general-purpose I/O (GPIO) pins

— 5 V tolerant I/O

— Individual control for each pin to be in peripheral or GPIO mode

Individual input/output direction control for each pin in GPIO mode

— Individual control for each output pin to be in push-pull mode or open-drain mode

— Hysteresis and configurable pullup device on all input pins

— Ability to generate interrupt with programmable rising or falling edge and software interrupt

— Configurable drive strength: 4 mA / 8 mA sink/source current

• JTAG/EOnCE debug programming interface for real-time debugging

IEEE 1149.1 Joint Test Action Group (JTAG) interface

EOnCE interface for real-time debugging

Power Saving Features

• Low-speed run, wait, and stop modes: as low as 781 Hz clock provided by OCCS and internal ROSC

• Large regulator standby mode available for reducing power consumption at low-speed mode

• Less than 30 μs typical wakeup time from stop modes

• Each peripheral can be individually disabled to save power

图1.MC56F825x方框图

图2.56800E核框图

图3.MC56F824x相移电源转换器框图

图4.MC56F825x高性能PMSM伺服系统框图

TWR-56F8257: MC56F8257 Tower MCU模块

The MC56F8257 Tower MCU module (TWR-56F8257) is a cost-effective evaluation, demonstration and development board. The TWR-56F8257 can operate stand-alone or as the main control board in a Tower System with peripheral modules. It can also be used as the main control board with an APMOTOR56F8000E motor control board.

TWR-56F8257主要特性:

The following list summarizes the features of the TWR-56F8257:

• Tower-compatible microcontroller module

• Selectable power sources:

USB

Barrel connector

Motor control board

Tower elevator board

• Filtered power for VDDA and VSSA on the MC56F8257DSC

• MC56F8257 digital signal controller (DSC) in an 64 LQFP package

• Optional 8 MHz crystal circuit for the MC56F8257 DSC

• Nine LEDs controlled by the MC56F8257 DSC