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MSP430F6736按键唤醒问题



我想问下就是我现在用6736做了一个板子因为PCB布局问题,按键的走线没有放在能产生中断的P1和P2口上,只能放在不带中断的I/O上。那当MCU休眠的时候我如何通过按键唤醒MCU?是否通过TIMER中断然后不断检测按键的状态?如果这样的话我设置在LPM3模式,其他外设都停止,只用TIMER中断的话功耗能到多少?我是一节3.6V的1/2AA电池供电,我想算下大约电池能用多少时间。