Question

1. Write an assembly program that interfaces switches, SW1 and SW2, and LEDs, LED1 and LED2, as follows (You should use interrupts for both switches) [50 pts] Initially, both the LEDs should be turned off. When SW2 is pressed for the first time, LED2 should be turned on. The next time SW2 is pressed, LED2 is turned off. The sequence continues hence each press changes the state of LED2. SW1 controls LED1 as follows: while SW1 is pressed, LED1 is on and when SW1 is released LED1 is turned off. Hint: Inside the ISR change the edge of P1IES to trigger the ISR as required a. b. c.

i need assembly program with screenshot of output please

Answer 1

;Switch interfacing
;
ORG 00H ;starting address

LED EQU P2.0
SWITCH EQU P2.6
  
  
AGAIN:

SETB LED
SETB SWITCH
MOV R3,#3H
  
MONITOR:
  
SETB LED
JB SWITCH, MONITOR
SJMP BLINK_LED
SJMP MONITOR
BLINK_LED:
CLR LED
ACALL WAIT
SETB LED
ACALL WAIT
  
DJNZ R3, BLINK_LED
SJMP AGAIN
  
WAIT:
MOV R0,#0H
HERE3: MOV R1,#0FFH
HERE2: MOV R2,0FFH
HERE: DJNZ R2,HERE
DJNZ R1,HERE2
DJNZ R0,HERE3
  
RET
END

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