基于MSP430的timerUart。利用MCU的定时器功能模拟uart（串口）操作。如果MCU不带硬件uart功能，就可以利用此代码完成uart的接收与发送-MSP430-based timerUart. MCU' s timer function using simulated uart (serial port) operation. If the MCU without the hardware uart function, you can use this code to com