555产生正当电路，译码器，进制转换 ，计时范围0~9s-Proper circuit 555, decoder, hex conversion timing range 0 ~ 9s

自己写的很实用的小程序，寄存器转换工具,将寄存器值转换为16进制表示- a very useful little program, the register conversion tool, the register value is converted to hexadecimal representation