基于AT89C51的超声波测距设计

            mov a,78h
            cjne a,#0h,pdcx
            mov a,77h
            cjne a,#5h,pdcx
            mov a,76h
            cjne a,#0h,pdcx
            mov 78h,#0bh
            mov 77h,#0bh
            mov 76h,#0bh
            ajmp xxcx
       pdcx:mov a,78h
            cjne a,#4h,xxcx
            mov a,77h
            cjne a,#0h,xxcx
            mov a,76H
            cjne a,#0h,xxcx
            mov 78h,#0ah
            mov 77h,#0ah
            mov 76h,#0ah
       xxcx:MOV 7AH,#0EFH
        XXX:LCALL DISPLAY                
            DJNZ 7AH,XXX
            ajmp cjzcx

       MULD:MOV A,R3      
            MOV B,R7
            MUL AB
            MOV R4,B      
            MOV R5,A
            MOV A,R3      
            MOV B,R6
            MUL AB
            ADD A,R4       
            MOV R4,A
            CLR A
            ADDC A,B
            MOV R3,A
            MOV A,R2       
            MOV B,R7
            MUL AB
            ADD A,R4       
            MOV R4,A
            MOV A,R3
            ADDC A,B
            MOV R3,A
            CLR A
            RLC A
            XCH A,R2       
            MOV B,R6
            MUL AB
            ADD A,R3       
            MOV R3,A
            MOV A,R2
            ADDC A,B
            MOV R2,A
            RET               

       DIVD:CLR C         
            MOV A,R3
            SUBB A,R7
            MOV A,R2
            SUBB A,R6
            JC DVD1
            SETB OV        
            RET
       DVD1:MOV B,#10H     
       DVD2:CLR C          
            MOV A,R5
            RLC A
            MOV R5,A
            MOV A,R4
            RLC A
            MOV R4,A
            MOV A,R3
            RLC A
            MOV R3,A
            XCH A,R2
            RLC A
            XCH A,R2
            MOV F0,C       
            CLR C
            SUBB A,R7      
            MOV R1,A
            MOV A,R2
            SUBB A,R6
            ANL C,/F0      
            JC DVD3
            MOV R2,A      
            MOV A,R1
            MOV R3,A
            INC R5         

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本文关键字：超声波  自动控制-单片机，电子制作 - 自动控制-单片机