11.5.1 Serving a High- or Low-Priority Interrupt While the Main Routine Code Is Executing

When a high- or low-priority interrupt is requested while the main routine code is executing, the main routine execution is halted and the ISR is addressed. Upon a return from the ISR (by executing the RETFIE instruction), the main routine resumes execution.

Figure 11-2. Interrupt Execution: High/Low-Priority Interrupt While Executing Main Routine

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