In our next tutorial, we will see how to use the multiple external interrupts in PIC16F877A. The switch is connected to an External interrupt pin. Whenever I press the switch it generates the interrupt and glows the LED. OPTION_REG=0X00 //falling edge int enable pullup portb You can find the header files and full project here. My PCLK is 11.0592MHz. External Interrupt – PIC16F877A Interrupt Tutorial Circuit Diagram Each interrupts will display the interrupt in LCD Module. In this tutorial timer 0 generates an interrupt on 1sec. T1CON=0b00000001 //prescale=1,oscilator is off,internal clk,timer on OPTION_REG=0b00000111 //internal clk,rising edge,prescaler with tim0,256 In this program, I have added only the main code. Timer Interrupt – PIC16F877A Interrupt Tutorial Circuit Diagram The OPTION_REG Register is a readable and writable register, which contains various control bits to configure the TMR0 Prescaler/WDT Postscaler (single assignable register known also as the Prescaler), the external INT interrupt, TMR0, and the weak pull-ups on PORTB. Reading PORTB will end the mismatch condition and allow the bit to be cleared (must be cleared in software).Ġ = None of the RB7:RB4 pins have changed state OPTION_REG INTF: RB0/INT External Interrupt Flag bitġ = The RB0/INT external interrupt occurred (must be cleared in software)Ġ = The RB0/INT external interrupt did not occurġ = At least one of the RB7:RB4 pins changed state a mismatch condition will continue to set the bit. RBIE: RB Port Change Interrupt Enable bitĠ = Disables the RB port change interruptġ-TMR0 register has overflowed (must be cleared in software) In this tutorial, we will see USART Interrupts, Timer Interrupts, External Interrupts. PIC 16F877A has the following 15 interrupt sources : Interrupt Introduction and Its FunctionsĪs the name suggests Interrupts are special events that require immediate attention, it stops a microcontroller/microprocessor from the running task and serves a special task known as Interrupt Service Routine (ISR) or Interrupt Handler.External Interrupt – PIC16F877A Interrupt Tutorialīefore learning PIC16F877A Interrupt Tutorial, we should know the basic interrupts and their functioning.Timer Interrupt – PIC16F877A Interrupt Tutorial.Serial Interrupt – PIC16F877A Interrupt Tutorial.
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