What is Portb change interrupt?

This topic shows how to use PIC16F84A microcontroller PORTB change interrupt, this interrupt occurs when an input port changes its state. The pins responsible for this interrupt are RB4, RB5, RB6 and RB7. The compiler used in this example is CCS PIC C.

How many external interrupts are provided in PIC 18f4550?

three external hardware
PIC18F4550 has three external hardware interrupts – INT0, INT1, and INT2. They are on PORTB pins RB0, RB1, and RB2 shown in the below image. These interrupts are edge-triggered interrupts i.e. triggered by either a rising edge or by a falling edge. The edge trigger bit is present in an INTCON2 register.

What is interrupt on change?

Interrupt On Change (IOC) is a hardware feature in most PIC® devices. It’s available on select I/O pins. When the hardware senses a change in state, low to high or high to low, an interrupt will occur. The interrupt service routine will be run, implementing any custom code the designer has developed.

Which are the different interrupt sources for pic?

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.

What are the 15 sources of interrupts in PIC16F877A?

What is global Interrupt?

The Global Interrupt Enable bit, GIE (INTCON<7>), enables (if set) all un-masked interrupts or disables (if cleared) all interrupts. Individual interrupts can be disabled through their correspond- ing enable bits in the INTCON register. The GIE bit is cleared on reset.

What is external interrupt in PIC microcontroller?

Interrupts are special events that require immediate attention. They cause the processor to cease the running task to serve a special task for which the interrupt event had occurred.

What are the differences between the external interrupts and pin change interrupts?

Each External Interrupt has its own ISR and they can be triggered independently by either a rising signal, falling signal, or by both. But the Pin Change Interrupts share an ISR between all the pins on a port (port B, C, and D).

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 do you mean by Gie & Peie?

GIE: Global Interrupt Enable bit. 1 = Enables all un-masked interrupts. 0 = Disables all interrupts. bit 6. PEIE: Peripheral Interrupt Enable bit.