[Moved] Why this 8051 code not functioning as expected?

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Hi,
I write sample code for using interrupt but when i simulate it into Proteus P1.1 is 0 from start and without pressing interrupt button

Code ASM - [expand]
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ORG 0
    LJMP MAIN
    EX0ISR:   
            CLR P1.1
    RETI
    ORG 0030H
        MAIN:
        MOV A,#00000111B    
        MOV P2,A        
        MOV IE,#85H
        SETB IT0
        SETB IT1
            SJMP MAIN
                END



In this code for 8051 i want to read data from matrix keyboard and save it in register R1 but this code just work one time why?

Code ASM - [expand]
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ORG 0
        LJMP MAIN
        EX0ISR:   
                MOV A,#11111111B        
        MOV P2,A                
                CLR P2.0        
                JB P2.3,J1
                        MOV R1,#3
                        J1:
                        JB P2.4,J2
                        MOV R1,#6
                        J2:
                    JB P2.5,J3
                        MOV R1,#9
                        J3:
                   JB P2.6,J4
                        MOV R1,#10
                        J4:
                SETB P2.0
                CLR P2.1
                JB P2.3,J5
                        MOV R1,#2
                        J5:
                        JB P2.4,J6
                        MOV R1,#5
                        J6:
                    JB P2.5,J7
                        MOV R1,#8
                        J7:
                   JB P2.6,J8
                        MOV R1,#0
                        J8:
                        SETB P2.1
                    CLR P2.2
                   JB P2.3,K1
                        MOV R1,#1
                        K1:
                        JB P2.4,K2
                        MOV R1,#4
                        K2:
                    JB P2.5,K3
                        MOV R1,#7
                        K3:
                   JB P2.6,K4
                        MOV R1,#11
                        K4:
                        
        RETI
        ORG 0030H
                MAIN:
        MOV A,#00000111B        
        MOV P2,A                
                MOV IE,#85H
                SETB IT0
                SETB IT1
                MOV P1,R1
                        SJMP MAIN
                                END
 
Last edited by a moderator:

Hi,

P1.1 is 0 from start and without pressing interrupt button
Click to expand...
What else do you expect? And why?

Klaus
 

Thanks,So what should i do?
 

i must ask, what are you trying to do?. why are you using the interrupt pin??. i have edited the keyboard scanning program. Please note the changes and edit as per your requirement.
Code: 
						ORG 0
        				LJMP MAIN
  						ORG 03H
						ACALL SCAN                 
				        RETI
				        ORG 0030H
  MAIN:
				        MOV A,#00000111B        
				        MOV P2,A                
		                MOV IE,#85H
		                SETB IT0
		                SETB IT1
		                MOV P1,R1
                        SJMP $

 SCAN:   				MOV A,#11111111B        
        				MOV P2,A                
                		CLR P2.0        
                		JB P2.3,J1
                        MOV R1,#3
            J1:
                        JB P2.4,J2
                        MOV R1,#6
            J2:
                    	JB P2.5,J3
                        MOV R1,#9
            J3:
	                    JB P2.6,J4
	                    MOV R1,#10
            J4:
		                SETB P2.0
		                CLR P2.1
		                JB P2.3,J5
                        MOV R1,#2
            J5:
                        JB P2.4,J6
                        MOV R1,#5
            J6:
                    	JB P2.5,J7
                        MOV R1,#8
            J7:
                   		JB P2.6,J8
                        MOV R1,#0
            J8:
                        SETB P2.1
                    	CLR P2.2
                   		JB P2.3,K1
                        MOV R1,#1
            K1:
                        JB P2.4,K2
                        MOV R1,#4
            K2:
                   	    JB P2.5,K3
                        MOV R1,#7
            K3:
                   		JB P2.6,K4
                        MOV R1,#11
            K4:	 		MOV P1,R1
						AJMP SCAN


                        END

in the above program the interrupts triggers keyboard scanning and exits only on reset.
 

I'm Trying to make a pulse generator in that user first enter one number that show frequency and then get duty cycle and then generate it but in this code i cut that section.
 

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