How do you interrupt in PIC microcontroller?
PIC 16F877A has the following 15 interrupt sources :
- External.
- Timer 0.
- Timer 1.
- RB Port Change.
- Parallel Slave Port Read/Write.
- A/D Converter.
- USART Receive.
- USART Transmit.
How many interrupts are available in PIC microcontroller?
The microcontroller has 14 interrupt sources. From the diagram below you can see all the sources of the interrupts, when xxIF is an interrupt flag and xxIE is an Interrupt Enable bit.
What is the state of microcontroller when interrupt occurs?
interrupt service routine
When an interrupt occurs, the microcontroller runs the interrupt service routine. For every interrupt, there is a fixed location in memory that holds the address of its interrupt service routine, ISR. The table of memory locations set aside to hold the addresses of ISRs is called as the Interrupt Vector Table.
Which is the external interrupt pin for pic16f877a?
You simply have to connect the LCD to the PIC as we did in interfacing LCD tutorial. Now to connect the interrupt pin, we should look at the datasheet to know which pin of the PIC is used for External interrupt. In our case i n PIC16F877A the 33 rd pin RBO/INT is used for external interrupt.
Is the pspif reserved on pic16f873a / 876a?
Note (1): PSPIF is reserved on PIC16F873A/876A devices; always maintain this bit clear. The PIE2 register contains the individual enable bits for the CCP2 peripheral interrupt, the SSP bus collision interrupts, EEPROM writes operation interrupt, and the comparator interrupt.
How to use external interrupts in PIC microcontroller?
In our case i n PIC16F877A the 33 rd pin RBO/INT is used for external interrupt. You cannot use any other pin other than this pin. The Pin connection for this circuit diagram is shown in the table below. We have enabled internal pull up resistors on PORT B, hence we can directly connect the RB0 pin to ground via a Push button.
Where does the interrupt service routine go in PIC18?
In PIC18 this address is 0008 (hex). CPU jumps to this address for any interrupt. The ISR or Interrupt service routine is placed in this address. The ISR must determine the source of interrupt from the flag bit (described above).