本例是将定时器1通道0(21脚)设为"跳变沿捕捉"(即电平发生变化时产生中断), 验证方法是将21脚不断接高电平、低电平，此时指示灯PTA1状态跟随改变-In this case is the timer 1 channel 0 (21 feet) set to " hopping along to capture"　(that is, a change in level when interrupted), authentication method is to continue to take 21 feet high, low, at this time PTA1 state to follow the light to change