51单片机的实用子程序，包括片内及片外ram初始化，滤波程序，多字节算术运算程序，排序程序，以及51定点运算子程序库，浮点运算子程序库等等。-51 SCM utility subroutine, including the chip and chip ram initialization, filtering procedures, procedures for multi-byte arithmetic operations, sorting procedures, and 51 fixed-