加法器是实现两个二进制数相加运算的 基本单元电路。8 位加法器就是实现两个8 位 二进制相加,同时加上低位进位的运算电路。-Adder is to achieve the sum of two binary computing the basic unit of the circuit. 8-bit adder is to realize the sum of two 8-bit binary, at the same time