flash管理算法，实现了均衡算法处理，支持slc，mlc

AVR453的DEMO程序，包括了一般电池管理的功能，过压保护，欠压保护以及一个简单的均衡算法。-The AVR453 DEMO program, including the general battery management function, overvoltage protection, undervoltage protection, as well as a simple balancing algorithm.