再仔细研究下数据手册吧，数据手册第85页，有这么一句话：
The GPIO Mux registers, are used to select the operation of shared pins on the F2810 and F2812 devices. The pins can be individually selected to operate as “Digital I/O” or connected to “Peripheral I/O” signals (via the GPxMUX registers). If selected for “Digital I/O” mode, registers are provided to configure the pin direction (via the GPxDIR registers) and to qualify the input signal to remove unwanted noise (via the GPxQUAL) registers).
Table 60 lists the GPIO Mux Registers.
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