刷卡发码延时程序，STC单片机，主要应用与学校中，老师上课刷卡打开设备，给录播设备发录像码开始率，下课老师拔卡后端口延时断开发码。-Card code delay procedures, STC microcontroller, the main application and the school, teacher in the class card open device, recording device for video code rate, the class teacher to pull the card after the port development delay fault code.