配置CCP1模块使之工作于PWM模式，并初始化周期和占空比。单片机的UART接口工作于全双工异步模式，1个起始位，8个数据位，1个停止位，波特率为9600，并开启接收中断，与PC机通信。编写程序实现功能：当UART接收到命令“S”时，LCD上显示“PWM Start”, PWM开始工作。当UART接收到命令“U”时，占空比增加，当UART接收到命令“D”时，占空比减少，并在LCD上显示占空比。当UART接收到命令“P”时, PWM停止工作，LCD上显示“PWM Stop”。并用示波器观察PWM输出波形的变化。

并使用ICD2仿真器进行程序的烧写和仿真调试。

-Configure the CCP1 module for PWM operation, and initialize the period and duty cycle. The microcontroller UART interface operates in full-duplex asynchronous mode, one start bit, 8 data bits, 1 stop bit, baud rate of 9600, and open to receive interrupt communication with the PC. Write a program to achieve functional: " PWM Start" , PWM start working when the UART receiver to command " S"　is displayed on the LCD. Increase the duty cycle when received by the UART command " U" , When UART receives command " D" , the duty cycle to reduce the duty cycle is displayed on the LCD. When the when UART receives command " P" , the the PWM stop working, PWM Stop " is displayed on the LCD. And observe the change of the PWM output waveform with an oscilloscope. And to use ICD2 emulator for procedural programming and simulation debugging.