Take the external interrupt level trigger as an example: when the CPU responds to the interrupt and enters the service program, the external low level must be removed before executing the RETI instruction to return to the main program. Otherwise, when the CPU returns to the main program, it will enter the interrupt again due to the external low level signal that is too long. This will not only cause an unnecessary erroneous operation, but also prevent the main program from running normally.
Similarly, other interrupt sources also have similar problems. Therefore, when using interrupts, you must be clear about whether the interrupt request (flag) should be removed and how to remove it before returning to the main program.
How to cancel the interrupt request of MCS-51
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