51单片机开发的几十个实例，使用时直接在源代码后附入所需的子程序，直接编译即可（注意对部分寄存器进行压栈保护）-51 single-chip developed by dozens of examples, when used directly in the source code attached to the required subroutine, the compiler can direct (the attention of some to push the protection of register)