免费毕业论文--超声波测距汽车倒车防撞雷达(一(7)
2013-06-15 01:35
导读：; CJNE A,#0H,XXCX MOV A,76H CJNE A,#0H,XXCX MOV 78H,#0AH MOV 77H,#0AH MOV 76H,#0AHXXCX:MOV 7AH,#0EFHXXX:LCALL DISPLAY DJNZ 7AH,XXX AJMP CJZCH MULD:MOV A,R3 MOV B,R7 MUL AB MOV R4,B MOV R5,A MOV A,R3 M
; CJNE A,#0H,XXCX MOV A,76H CJNE A,#0H,XXCX MOV 78H,#0AH MOV 77H,#0AH MOV 76H,#0AHXXCX:MOV 7AH,#0EFHXXX:LCALL DISPLAY DJNZ 7AH,XXX AJMP CJZCH
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,ARET
DIVD:CLR C MOV A,R3 SUBB A,R7 MOV A,R2 SUBB A,R6 C DVD1 SETB OV RETDVD1: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 DVD3:DJNZ B,DVD2 MOV A,R4 MOV R2,A MOV A,R5 MOV R3,A CLR OV RETBCD转换HB2:CLR A ;BCD码初始化 MOV R3,A MOV R4,A MOV R5,A MOV R2,#10H ;转换双字节十六进制整数HB3:MOV A,R7 ;从高端移出待转换数的一位到CY中 RLC A MOV R7,A MOV A,R6 RLC A MOV R6,A MOV A,R5 ;BCD码带进位自身相加，相当于乘2 ADDC A,R5DA A ;十进制调整 MOV R5,A MOV A,R4 ADDC A,R4DA A &
