ADC0808与单片机的连接中，在延时函数中实现输出CLK脉冲，就可以既不用外接硬件，也不占用单片机本身的硬件资源，同样也达到了延时目的，可谓一举多得-ADC0808 with microcontroller connection, the delay function to achieve the output CLK pulse, you can either use an external hardware, nor hardware resources occupied by the microcontroller itself, also reached the purpose of delay, has multiple purposes