Difference between Polling and Interrupt Method The main disadvantage of this technique is the wastage of microcontroller time and resources. The polling method is kind of a round-robin method. Because polling is not an efficient method and it halts microcontroller execution at the same location waiting for the condition to meet. But now we will see an interrupt method to receive data. Why do we need to use PIC UART Interrupt?īut we used a polling method to receive string or data with pic UART module. Receive data Serially (receive string with pic uart).Send data serially ( send string with uart).Because in that guide, we explain the following concepts of UART Module: I recommend you to read this tutorial first. This PIC18F4550 tutorial is a part of UART Communication using Pic Microcontroller. ISR routine used to read data from the receiver register (RCREG). As soon as UART receives register raises a full capacity interrupt (RCIF), an interrupt service routine (ISR) will be called. Unlike, a polling method, a UART interrupt method doesn’t wait for the data and keep executing or doing other tasks. We will use the PIC18F4550 microcontroller to receive data serially. we have explained five types above.In this tutorial, we will see how to use UART interrupt of pic microcontroller. Last argument is the types of interrupt you are using. Second argument is function name to which you want to call upon every interrupt. one is a pin number to which pin you want to use for external interrupt triggering. This function takes two arguments as a input. Attach interrupt function is used for this purpose.

Now lets see how to use Arduino interrupts functions already available in Arduino IDE to initialize Arduino interrupts and with which pin of Arduino you want to initialize it.

pin number 2 than ISR is the function which is going to be call and mode tells that whenever the interrupts is been triggered. The syntax which are going to be attach interrupt and specify the pin e.g. High: High is a continuous trigger whenever the signal is high in other words the signal is on 5v.Low: Low is a continuous trigger whenever the signal is low in other words the signal is on 0v.Falling: On a falling edge the signal going from high to low means signal is triggering from 5v to 0v.Rising: On a rising edge the signal going from low to high means signal triggering from 0v to 5v.

Change: When signal change even if signal rise or signal fall or if the signal is in low state at 0 or if the signal is in high state trigger 5v.

Micro 800 interrupts example