它提供了一个真正的由AVR MCU本身自动下载和更新（采用读/写同时“Read-While-Write”进行的方式）程序代码的系统程序自编程更新的机制。利用AVR的这个功能，可以实现在应用编程（IAP）以及实现系统程序的远程自动更新的应用。-It provides a real AVR MCU itself automatically download and update (with read/write at the same time " Read-While-Write" ) code system program since the programming updated mechanism. Take advantage of the AVR this feature, can automatically update the application in the Application Programming (IAP) and the remote system program.