uC/OS-Ⅱ是一个免费的源代码公开的实时嵌入式内核，它提供了实时系统所需的基本功能。其包含全部功能的核心部分代码只占用8.3K字节，而且由于uC/OS-Ⅱ是可裁剪的，所以用户系统中实际的代码最少可达2.7K字节，可谓短小精悍。-uC/OS- Ⅱ is a free open source real-time embedded kernel, which provides the basic functions required for real-time systems. It includes all the features of the core part of the code only occupies 8.3K bytes, and because cutting uC/OS- Ⅱ are available, so the actual code in a user' s system at least up to 2.7K bytes, can be described as dapper.