两个单片机最小系统，能实现有线通信，一方为发射，另一方为接收。发射方按键，接收方显示对应信息.两个单片机最小系统能相互通信，并能实现校验-The two smallest single-chip systems, to achieve wired communications, the party for the launch, the other for receiving. Launch side button, the receiver shows the corresponding in