Interrupts with PIC18F4550

A

ahsrabrifat

Active Member

• Jun 6, 2025

• #2

How to work with External Interrupts of PIC Microcontroller

Interrupts are special events that require immediate attention. They cause the processor to cease the running task to serve a special task for which the

pic-microcontroller.com

PIC18F4550 External Interrupt | PIC Controllers

The external interrupt is a mechanism for devices that interrupts the controller to get the attention of the controller. Here we are going to toggle LED using a switch as an external interrupt.

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Ian Rogers

User Extraordinaire

Forum Supporter

Most Helpful Member

• Jun 6, 2025

• #3

Vladimir has an interrupt example

PIC Simulator IDE BASIC Compiler Reference Manual

All you need to do is modify for each interrupt.
If you have multiple triggers then determine each in turn like this.

Code:

On Interrupt
    If INT0IF then  'int0 flag
            ' do int 0 stuff
   endif
   If INT1IF then  ' int 1
            ' do int 1 stuff
   endif
   If INT2IF then   ' int 2
            ' do int 2 stuff
   endif
Resume

 

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J

Jtomas

New Member

• Jun 6, 2025

• #4

Thank you so much.

 

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DogFlu66

Member

• Jun 7, 2025

• #5

I have this old simulation practice on the 2550, I'll leave you the codes in case it helps.

 

Attachments

• _FuncionesPic18F2550.bas

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• Practicas Interrupcion Exterior RB0_INT0 Pic18F2550.bas

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Last edited: Jun 7, 2025

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J

Jtomas

New Member

• Jun 9, 2025

• #6

Thank you very much, Regards

 

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