包含单片机延时子程序 该延时程序不同于一般延时程序 可实现ms us的精确延时 还包含宏定义程序 可供单片机初学者参考-Subroutine contains the single-chip delay of the delay procedure is different from the general delay process can be delayed ms us the exact definition of the procedure also includes macros for single-chip reference for beginners