基于51超聲波測距器設(shè)計(jì)-資料下載頁
2024-11-16 20:52本頁面
【導(dǎo)讀】采用AT89S5112ＭＨz晶振。顯示緩沖單元在４０Ｈ～４３Ｈ，使用內(nèi)存44H、45H、46H用于計(jì)算距離。*中斷入口程序*. MOVR0,#40H;40~43H為顯示數(shù)據(jù)存放單元。MOVTMOD,#21H;T1為8位自動重裝模式，T0為16位定。MOVR4,#04H；超聲波脈沖個數(shù)控制。JNB00H,START1;收到反射信號時標(biāo)志位為1. LCALLWORK；計(jì)算距離子程序。SETBTR0；重新開啟測距定時器。MOVR2,#64H；測量間隔控制。;T0中斷，65ms中斷一次。SETBTR0;啟動計(jì)時器T0，用以計(jì)算超聲波。CLRTR1；超聲波發(fā)送完畢，關(guān)T1. MOV44H,TL0；將計(jì)數(shù)值移入處理單元。SETB00H；接收成功標(biāo)志。;40H為最高位，43H為最低位，先掃描高位。；共陽數(shù)碼管0,1,2,3,4,5,6,7,8,9,不亮，A,—。*距離計(jì)算程序近似。*四字節(jié)/兩字節(jié)無符號數(shù)除法程序*
【正文】 END NAME DELAY ?PR?_DELAY?DELAY SEGMENT CODE PUBLIC _DELAY RSEG ?PR?_DELAY?DELAY _DELAY: PUSH ACC MOV A,R7 JZ DELA1 INC R6 DELA1: MOV R5,50D DJNZ R5, $ DJNZ R7,DELA1 DJNZ R6,DELA1 POP ACC RET END NAME DISPLAY ?PR?_DISPLAY?DISPLAY SEGMENT CODE ?CO?_DISPLAY?DISPLAY SEGMENT DATA EXTRN CODE (_DELAY) PUBLIC _DISPLAY RSEG ?CO?_DISPLAY?DISPLAY ?_DISPLAY?BYTE: DISPBIT: DS 1 DISPNUM: DS 1 RSEG ?PR?_DISPLAY?DISPLAY _DISPLAY: PUSH ACC PUSH DPH PUSH DPL PUSH PSW INC DISPNUM MOV A,DISPNUM CJNE A,4D,DISP1 DISP1: JC DISP2 MOV DISPNUM,00H MOV DISPBIT,0FEH DISP2: MOV A,R1 ADD A,DISPNUM MOV R0,A MOV A,@R0 MOV DPTR,DISPTABLE MOVC A,@A+DPTR MOV P0,A MOV A,DISPNUM CJNE A,2D,DISP3 CLR DISP3: MOV P2,DISPBIT MOV R5,00H MOV R7,0AH LCALL _DELAY MOV P0,0FFH MOV P2,0FFH MOV A,DISPBIT RL A MOV DISPBIT,A POP PSW POP DPL POP DPH POP ACC RET DISPTABLE: DB 0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,90H,88H,83H,0C6H,0A1H,86H,8EH,0BFH,0FFH END
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鄂ICP備17016276號-1