C8051F 的串口测试程序。96M晶振，9600波特率。 包括PLL、pinmux等模块的初始化。 keil C 下编译、测试。-C8051F serial port test program. 96M crystal oscillator, 9600 baud rate. Including the PLL, pinmux such as module initialization. keil C compiled and tested.