软件采用汇编语言编写，包括初始化、按键及相应子程序、外部和串口等中断程序。
The software is programmed in assembly language, including initialization, key-press and interrupt program such as corresponding subprogram, external and serials.
单片机与CPLD共用外部RAM，采用中断和软件定时策略解决了访问冲突问题。
Visiting conflict that MCU and CPLD visit the same RAM in same time can be avoided by applying interruption and software timing strategy.
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