触摸屏中断服务程序在对寄存器进行设置和指定中断服务程序的入口地址后， 程序进入等待状态，当用触摸笔点按触摸屏时，处理器接受中断，并进入中断服务程序的执-Touch screen interrupt service routines to register in setting and specify the interrupt service routine entry address Program waiting for state, when with touching pen c