PIC microcontroller interrupt tutorial. PIC interrupt tutorial: General Background. CLICK here for a quick PIC interrupt tutorial. In this tutorial we will study about the Polling and especially on the PIC Interrupt. We will look at. Computer systems include microcontroller, which includes.

The user is the one who determines the time intervals in which micro “contacts” the device. In the Polling method, the PIC microcontroller must . In fact we see that in the Polling method the external devices are not independent systems; they depend on the microcontroller, and only the micro is entitled to obtain access to the information it needs. The main drawback of this method when writing program is waste of time of microcontroller, which needs to wait and check whether the new information has arrived.

Interrupt is “requesting. In fact, the method of interrupt defines the option to transfer the information generated by internal or external systems inside the micro by them self!

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Once the system has finished the task imposed on it, the processor will be notified that it can access and receive the information and use it. Common example is pressing on the key on the keyboard, which causes to the keyboard to send Interrupt to the microcontroller to read the information of the pressed key. For example, division by 0 will causes an interrupt. Mq 7 Installation On Solaris Key. An example: Procedure - when there is a procedure call, the processor stops the execution of the program, jumps to the place in memory that reserved for a procedure – executes the procedure and only then returns back to the program and continues to execute. When the interrupt is “blocked”, the PIC microcontroller does not .

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In fact the blocked interrupt will not be executed until it will be unblocked. For example: The processor is in the middle of a calculation, and we do not want to write into memory until the micro did not finish the calculation. In this situation, we will “block” the .

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We will “unblock” the interrupt only after the processor finished the calculation, thus preventing him to write into the memory as long as it is in the middle of the action. There are some interrupts that can not be “masked”/”blocked” - NMI - Non Mask able Interrupts. They are used to report on critical hardware issues, such as the drop of voltage.

In this situation we are interested in immediate response from the processor without the ability to ignore them. From the diagram below you can see all the sources of the interrupts, when xx. IF is an interrupt flag and xx.

IE is an Interrupt Enable bit. Interrupt flag shows the result of an interrupt and interrupt enable bit is used to enable or to “block” the interrupt.

The interrupts on the left side of the figure below are low priority and all of them together can be “blocked” by enabling bit interrupt PEIE = 0. This is done by using the global interrupt enable bit - GIE. When the GIE = 1 we are enabling the interrupts, and if the GIE = 0 we are blocking all of the interrupts. PIE (PIE1, PIE2) – This register contains the interrupt enabling bits of the low- priority interrupts. PIR (PIR1, PIR2) – This register contains the interrupt flags of the low- priority interrupts. CLICK HERE to look at the interrupt control registers in more details. Writing a C language program to implement external interrupt.

Let’s write an example program, where we will explore the way we need to define the external interrupt connected to PORTB pin RB0. The program will play a sound from a buzzer that is located on the Edu. PIC development board, every time there is an external interrupt that is generated through RB0 pin. Instead, we will “create an external interrupt” using our program itself, by incrementing the value of PORTB by 1.

As explained above, when there is a logic change in the pin RB0, from . When we are increasing the value by 1, the last bit (LSB) will vary each cycle of the program from . Thus, any change in the last bit (which is actually a change to the pin RB0) from . The change in the value in the last bit of Port. B is described in the example below. In order for us to work with the interrupts, we need to learn another function: interrupt function. This function is a special function.

So far functions were called from the main program or other functions. The interrupt functions is called by the hardware itself and operates by following steps. After the interrupt function is loaded into the memory, the function waits for a moment for the interrupt to occur; When the interrupt has occurred, the operating system stops the execution of the main function and “free itself” to perform the interrupt function; After the execution of the interrupt function, the operating system continues to run the main function from the place it stopped before the interrupt has occurred.

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