Interrupts with PIC18F4550

Jtomas · 2025-06-05T02:36:18-0700

Hello everyone,
I'm trying to configure the PIC 18F4550 with PIC SIMULATOR IDE and I can't get it to work. I need to use external interrupts via INT0, INT1, and INT2. I'm sure I'm not configuring the interrupt registers correctly. Can you send me a simple example that might help?
Best regards and thanks.

ahsrabrifat · 2025-06-06T00:50:15-0700

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

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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 · 2025-06-06T01:03:12-0700

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

Jtomas · 2025-06-06T09:13:51-0700

Thank you so much.

Interrupts with PIC18F4550

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