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I would like to share with you what the instructions for interrupting the service program are. I believe most people don't know much about it, so share this article for your reference. I hope you will gain a lot after reading this article. Let's learn about it together.

The last instruction of the interrupt service program must be: RETI, that is, the interrupt return instruction, used only at the end of the interrupt service program. After the interrupt program is completed, be sure to execute a RETI instruction. After executing this instruction, CPU will take out the address saved in the stack and send it back to PC, and the program will continue to execute from the interrupt of the main program.

The last instruction of the interrupt service program must be: RETI.

RETI is the interrupt return instruction

The function of this instruction is similar to that of the RET instruction. The difference between the two instructions is that when the interrupt response is cleared, the non-addressable "priority effective" trigger within the MCS-51 of the set 1 is cleared.

After the interrupt program is completed, be sure to execute a RETI instruction. After executing this instruction, CPU will take out the address saved in the stack and send it back to PC, and the program will continue to execute from the interrupt of the main program. As an interrupt jump instruction, the interrupt instruction "RETI" not only takes out the address saved in the stack and sends it back to PC, so that the program continues to execute from the interrupt of the main program, but also has the function of zeroing the "priority effective" trigger.

The above is all the contents of the article "what is the instruction of the interrupt service program?" Thank you for your reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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