此程序可完成CP1比较器的比较功能，比较器基准信号来自于VREF引脚,

　　 比较器响应后将产生中断,可在中断程序中设断点观察.-This program can complete the comparison function of the comparator CP1, the comparator reference signal from the VREF pin, the comparator generates an interrupt response will be set breakpoints in the interrupt routine observation.