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Assembly Programming
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Write a sequence of instructions to configure PQ2 pin (the SW0 button on the lab kit) as a source of INT0.

INSTRUCTIONS TO CANDIDATES
ANSWER ALL QUESTIONS
  1. Write a sequence of instructions to configure PQ2 pin (the SW0 button on the lab kit) as a source of INT0. Configure PQ2 to interrupt on the falling edge. Place INT0 interrupt on high priority. Enable interrupt globally.

 

  1. Write the interrupt service routine for INT0 interrupt of PORTQ, which
  • Clear the INTo interrupt flag
  • Check the PA7 pin. If PA7 is high, increment the data memory location at 0x2050. Otherwise decrement the data memory location at 0x2050.
  • Output the value of data memory location at 0x2050 to PORTB.

 

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