说明：  BCM的遥控接收软件 1、由主CPU的RF_IN发高电平进入学习状态，低电平退出学习状态 2、学习完成1pcs遥控器，由RF_OUT返回1脉冲给主CPU 3、工作时收到有效遥控信号时，由RF_OUT返回主CPU按键盘值数据，为4bit
(BCM remote control software 1, the main RF_IN of the CPU to enter the learning state of high level, low level of learning state 2, learning to complete the 1pcs remote control, by the RF_OUT to return to the main CPU 1 3, when the work of the effective remote control signal received by the RF_OUT to return to the main CPU by )