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https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/813424/tm4c1294ncpdt-what-happens-if-a-a-higher-priority-interrupt-occurs-during-lower-priority-interrupt
如果在较低优先级的 ISR 期间发生较高优先级的中断、会发生什么情况？ 后者会被抢先吗？ 后者是否会在前者完成后恢复执行？
一个较高优先级的中断将优先于较低优先级。 在所有较高优先级的中断被处理后、将用较低优先级的中断恢复执行。
