附件压缩包中有proteus仿真软件的仿真图，能完美的仿真51单片机超声波测距并且有完整的程序供你你们参考.
所有资料打包下载：
51单片机超声波测距程序.zip
(544.6 KB, 下载次数: 220)
仿真原理图：
单片机汇编语言源程序：
- ORG 0000H
- LJMP MAIN
- ORG 0003H
- LJMP INTT0
- ORG 0013H
- LJMP INTT1
- ORG 0030H
- MAIN: MOV TMOD,#01H
- MOV TL0,#00H
- MOV TH0,#00H
- MOV IE,#0FFH
- SETB IT1
- CLR EX1
- CLR IT0
- CLR P3.4
- DDD: JB P1.0,JJJ
- SETB P3.4
- SETB EX1
- MOV 30H,#00H
- MOV 31H,#00H
- MOV 32H,#00H
- JJJ: LCALL DIS
- LJMP DDD
-
- INTT0: CLR P3.4
- CLR EX1
- RETI
-
- INTT1: MOV A,30H
- CJNE A,#09H,L1
- MOV 30H,#00H
- MOV A,31H
- CJNE A,#09H,L2
- MOV 31H,#00H
- MOV A,32H
- CJNE A,#09H,L3
- MOV 32H,#00H
- LJMP L4
- L1: ADD A,#01H
- MOV 30H,A
- LJMP L4
- L2: ADD A,#01H
- MOV 31H,A
- LJMP L4
- L3: ADD A,#01H
- MOV 32H,A
- LJMP L4
- L4: RETI
-
- DIS: MOV R0,#30H
- MOV R1,#03H
- MOV R2,#0FEH
- LLL: MOV A,R2
- MOV DPTR,#0BFFFH
- MOVX @DPTR,A
- MOV A,@R0
- MOV DPTR,#TAB
- MOVC A,@A+DPTR
- MOV DPTR,#7FFFH
- MOVX @DPTR,A
- LCALL TIME
- INC R0
- MOV A,R2
- RL A
- MOV R2,A
- DJNZ R1,LLL
- RET
-
- TIME: MOV R7,#04H
- KKK: MOV R6,#0FFH
- DJNZ R6,$
- DJNZ R7,KKK
- RET
-
- TAB: DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH
- END
-
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