Abstract: This paper presents a new design of PDA. Using the limited hardware resources designs and develops a PDA system whose performance approaches to the high level in lower CPU which lacks of MMU. This plan fully uses the multi-duty and the protection of embedded operating system μC/OS-II, reasonably coordinates some contradictions between hardware resources and software system. Proved by the experimental result that compared with the original PDA system, this plan has lower cost, the better reliability, more function and more friendly user interface and so on.

Key words: Personal digital assistant (PDA), Embedded system, μC/OS-II, MiniGUI

摘要： 给出了一个新的PDA设计方案，利用有限的硬件资源在缺少MMU的低端CPU上设计并开发出性能接近高端的PDA系统。充分利用了嵌入式操作系统μC/OS-II的多任务和保护机制，合理地协调了硬件资源和软件系统之间的一些矛盾。实验结果证明该方案与原有PDA系统相比具有成本低、可靠性好、功能多和用户界面友好等特点。

关键词: PDA, 嵌入式系统, μC/OS-II, MiniGUI