Pic microcontrollers, for beginners too online, author. Interrupts could be classified based on the source of the interrupt signal, and also based on the way its implemented in memory. This is a part of the sequence of pic tutorials in which we started learning pic microcontrollers from scratch. For now, well generally discuss interrupts in microcontrollers. Interrupts in pic microcontrollers embedded systems. Interrupt signals could be generated by hardware or software. How many clock pulses are confined by each machine cycle of peripheralinterface controllers. A microcontroller is a small, lowcost and self contained computeronachip that can be used as an embedded system. The 8259 is known as the programmable interrupt controller pic. Interrupts can be easily handled by using reserved word interrupt. Pic16f877 interrupts cont the microcontroller has 14 interrupt sources xx if is an interrupt flag that shows the result that we are getting from an interrupt. Pic microcontroller interrupt forces the microcontroller to suspend execution of the main program and immediately execute a special set of instructions.
Prerequisites before learn pic16f877a interrupt tutorial, we should know the basic interrupts and its. Xx ie is an interrupt enable bit that is used to enable or block the interrupt. Now we are going to see pic16f877a interrupt tutorial. In this tutorial we will learn how to use an external interrupt in pic microcontroller and whywhere we will need them. Pic16f877a interrupt tutorial external, timer, uart intr. A few microcontrollers may utilize fourbit expressions and work at clock rate frequencies, which usually include. Hence, it is named as external memory microcontroller. As for pic microcontrollers the programming words of which are comprised of 14 bits, the instruction set has 35 different instructions in total.
A project entitled pic microcontroller unit presented by quezon city polytechnic university qcpu, fourth year students of bachelor of science in information technology bsit, major in computer technology. Microcontrollers introduction, microcontrollers types and. How to use external interrupts in mikroc on pic microcontroller. The interrupts on the left side of the figure previous slide are.
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