In a tutorial section on assembly language programming, we explain the mechanism of interruptions made ​​by the 18F2550 to manage several of its internal devices.

Description: In this tutorial, we explain the capabilities that have the ANSI C language (C18 compiler) for interrupt handling and use thereof in the case of the 18F2550 microcontroller.

When compared with assembly language, using interrupts from C represents considerable savings in time, due to the great simplification in the handling of bit registers and variables.

The simple program explained below was used to generate a 1 high precision 1 second interrupt, flashing LED0 each second.