RF ID schematic for communication with RFIS transponder

使用STM32F103CET6，实现进入STOP低功耗休眠，然后RTC定时唤醒读取卡片的功能。读取后使用485发送一个消息(The use of STM32F103CET6, to achieve the STOP low power sleep, and then RTC regularly wake-up card reader function.)