研究32位Cortex-M3 MCU开发技术

本文介绍了LM3S9B96 MCU Cortex-M3处理器方框图以及Stellaris? LM3S9B96开发板主要特性，方框图，电路图和扩展板电路图。

德州仪器（TI）公司Stellaris?所提供一系列的微控制器是首款基于ARM? CortexTM-M3的控制器，它们为对成本尤其敏感的嵌入式微控制器应用方案带来了高性能的32位运算能力。这些具备领先技术的芯片使用户能够以传统的8位和16位器件的价位来享受32位的性能，而且所有型号都是以小占位面积的封装形式提供。

LM3S9B96微控制器的优势还在于能够方便的运用多种ARM的开发工具和片上系统（SoC）的底层IP应用方案，以及广大的用户群体。另外，该微控制器使用了兼容ARM Thumb?的Thumb2指令集来减少存储容量的需求，并以此达到降低成本的目的。最后，LM3S9B96微控制器与Stellaris?系列的所有成员是代码兼容的，这为用户提供了灵活性，能够适应各种精确的需求。

为了能够帮助用户产品快速的上市，德州仪器（TI）公司提供了一整套的解决方案，包括评估和开发板、白皮书和应用笔记、方便使用的外设驱动程序库、以及强大的支持、销售和分销商网络。

LM3S9B96目标应用：

The Stellaris family is positioned for cost-conscious applications requiring significant control processing and connectivity capabilities such as:

Remote monitoring

Electronic point-of-sale （POS） machines

Test and measurement equipment

Network appliances and switches

Factory automation

HVAC and building control

Gaming equIPMent

Motion control

Medical instrumentation

Fire and security

Power and energy

Transportation

　
图1.Stellaris LM3S9B96方框图

图2.Stellaris LM3S9B96 Cortex-M3处理器方框图

Stellaris? LM3S9B96开发板

The Stellaris? LM3S9B96 Development Board provides a platform for developing systems around the advanced capabilities of the LM3S9B96 ARM? Cortex?-M3-based microcontroller.

The LM3S9B96 is a member of the Stellaris Tempest-class microcontroller family. Tempest-class devices include capabilities such as 80 MHz clock speeds, an External Peripheral Interface （EPI） and Audio I2S interfaces. In addition to new hardware to support these features, the DK-LM3S9B96 board includes a rich set of peripherals found on other Stellaris boards.

The development board includes an on-board in-circuit debug interface （ICDI） that supports both JTAG and SWD debugging. A standard ARM 20-pin debug header supports an array of debugging solutions.

The Stellaris? LM3S9B96 Development Kit accelerates development of Tempest-class microcontrollers. The kit also includes extensive example applications and complete source code.