GPIO口/UART接口内部逻辑框图
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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