本人用51宏汇编编写的一个3字节乘以2字节的子程序，本人多次使用，由于是用汇编编写，使用运行速度很快-51 macro assembler, I used to prepare a 3-byte multiplied by 2 bytes of subroutine, I have repeatedly used, as is the preparation of the compilation, the use of running fast