中断法进行AD采样（f3xx)

适用于F3xx,对AD采样进行调试。ad_sample:movamx0p,#0ch;selectchannel单端方式movamx0n,#11h;采P14setbad0busyMOVC,AD0BUSYJC$movamx0p,#0dh;采P15movamx0n,#11hnopnopnopsetbad0busyMOVC,AD0BUSYJC$jmpad_sample