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.
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.
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 many GPIO pins does a pic16f877a have?
Therefore, the current limit for each GPIO pin of PIC16F877A is 10 mili ampere. It is available in four IC packaging such as 40-pin PDIP 44-pin PLCC, 44-pin TQFP, 44-pin QFN PIN CONFIGURATION AND DESCRIPTION Of PIC16F877A microcontroller As it has been mentioned before, there are 40 pins of this microcontroller IC.
Which is PORTB pins have interrupt on change ( IOC )?
This post shows an example of PIC16F877A PORTB interrupt on change (IOC). Four of the PORTB pins, RB7:RB4, have an interrupt-on-change (IOC) feature. Only pins configured as inputs can cause this interrupt to occur (i.e., any RB7:RB4 pin configured as an output is excluded from the interrupt-on-change comparison).
What does the mismatch output of RB7 RB4 do?
The “mismatch” outputs of RB7:RB4 are OR’ed together to generate the RB port change interrupt with flag bit RBIF (INTCON<0>). This interrupt can wake the device from Sleep. The user, in the Interrupt Service Routine, can clear the interrupt in the following manner: