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GPIO（英语：General-purpose input/output），通用型之输入输出的简称，功能类似8051的P0—P3. Peripherals and Interfaces – General Purpose I/O (GPIO) – UART (2) – USB (enhanced) – Keypad – Ringer – M/N Counter – Housekeeping A/D – Microphone amplification – Speaker drivers interface – LCD Support – JTAG GPIO的逻辑框图
GPIO的复用功能罗列：
Universal Asynchronous Receiver Transmitter 与RS232接口协议兼容
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