一个2位的BCD码十进制加法计数器电路，输入为时钟信号CLK，进位

输入信号CIN，每个BCD码十进制加法计数器的输出信号为D、C、B、A和进位输出信号COUT，输入时钟信号CLK用固定时钟，进位输入信号CIN.

-A 2-bit BCD code decimal adder counter circuit input as the clock signal CLK, a carry input signal CIN, D, C, B, A, and the carry output signal COUT, each BCD code decimal adder counter' s output signal, the input clock signal CLK Fixed clock, binary input signal CIN.