PIC16887A单片机RA4接一个按键，要求每按一下按键S1，必须进入中断，在中断中让LED闪亮。即使用时钟中断来实现不带中断的按键实现中断。-PIC16887A SCM RA4 by one button, click the button for each requirement S1, must enter an interrupt, the interrupt enable LED flashes. That the use of clock interrupts to implement the key to achieve without interruption interruption.