interrupt. - RB COMPONENTES


What are the different types of interrupts?

The current interrupts are: • INT Pin Interrupt (external interrupt) • TMR0 Over?ow Interrupt • PORTB Change Interrupt (pins RB7:RB4) • Comparator Change Interrupt • Parallel Slave Port Interrupt • USART Interrupts • Receive Interrupt • Transmit Interrupt • A/D Conversion Complete Interrupt • LCD Interrupt.

What is the PORTB interrupt on change feature?

SUMMARY The PORTB interrupt on change feature is both a very convenient method for direct interfacing to an external keypad, with no additional components, but is also versatile in its uses the ability to add up to four additional external interrupts. Of course hybrid solu- tions are also possible.

What is an example of a single Interrupt source?

Example 2 shows a single interrupt source on PORTB (RB7), which executes the interrupt service routine on a rising edge . The interr upt source has a wide pulse width. In this case since the interrupt pulse width is large, the pulse is still high before PORTB is read to end the mismatch condition.

How do I use the “interrupt on change” feature?

When this inter- rupt is used in conjunction with the software programmable weak internal pull-ups, a direct interface to a keypad is possible. This is shown in application note AN552, Implementing Wake-up on Key Stroke. Another way to use the “interrupt on change” feature would be as additional external interrupt sources.

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