功能强大的时钟中断，单片机和FIFO的接口和操作，单片机串口编程问题，纯软件单片机串口，串口通信的单片机程序，程序的多任务和资源复用举例，采用软件定时的计算方法-powerful clock interruption, the 8031 and FIFO interface and operation, the 8031 serial programming, software-only MCU, the MCU serial communication procedures, the procedures for multi-task and resource reuse, for example, regularly use the software method of calculation