There are two Creative points in my design: one is that in C9318, addition unit is one-bit serial mode. Thereby, completing a decimal BCD code addition operation needs four-clock period.

• 本设计的创新之处在于:一、C9318 采用一位串行加法器,即每次只能进行一位二进制的运算,完成一位十进制BCD 码的加法运算需要四个时钟周期,况且BCD 码的校验要等到下一个指令周期时才能完成。