此程序可完成CP0比较器的比较功能，比较器CP0+来自于VREF引脚,CP0-由S2控制.按下S3后,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 be completed relatively CP0 comparator function, the comparator from the VREF pin CP0+, CP0-controlled by the S2. Press the S3, the comparator generates an