AVR通用延时子程序。利用寄存器内容减1 不0 为转的多级嵌套,只需改变一个寄存器延时常数, 就可改变延时时间-AVR General Delay routine. Register is decremented by 1 does not use 0 as the transfer of multi-level nested, simply by changing a constant delay register, you can change the delay time