UPC EETAC Bachelor's Degree in Telecommunications Systems and in Network Engineering EEL

 

  

Basic concepts on port RB interrupt

L10

How to detect events (edges on signal changes)?

(under preparation)

Port B pins

A Port B (RB) hardware.

  Fig. 1. 

 

Interrupt logic to enable and attend interrupts

Enabling external RB interrupts. Configuration bits.

 

Fig. 2.

 

 

Interrupt service routine. Software flag

 

- Tutorial example on the use of the Port B and external INT interrupts. Class discussion (1), (2). This is the adaptation when using this demonstration board. [Replace PIC16F877 by PIC18F4520)]

Example tutorial.

 

RBIF (interrupt-on-change). How to interface a matrix keyboard at PORTB? Pull-up resistors and interrupt flag RBIF (interrupt-on-change feature recommended for wake-up on key depression operations.