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使用KEY中断触发时，可以同时使用边缘触发不，也就是说上升沿河下降沿都产生触发
按键中断可以使用边缘触发
单独上升沿下降沿我都可以做到触发中断，不过可以在同一个程序中上升沿下降沿都能触发中断么？
请看下PICTL这个寄存器，只有两种配置：0: Rising edge on input gives interrupt. 或者1: Falling edge on input gives interrupt
