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为什么我程序里只初始化一个定时器,却可以用两个定时器中断?

Other Parts Discussed in Thread: MSP430FR5739

我芯片型号是msp430fr5739,我初始化了timer_A1.但是我可以同时用Timer_A1,和Timer_A0两个定时器中断。而且这两个中断都有效(我在每个定时器中断里翻转特定的两个引脚,用示波器看过波形都是对的)。我还测试过,如果只单独开一个定时器中断,把另一个给屏蔽掉,则引脚不能正常翻转,且暂停程序后会进入到isr_trap.asm文件中。这个问题困扰我好久了,希望能得到专业的解答。谢谢。