出租車計(jì)價(jià)器的設(shè)計(jì)-閱讀頁(yè)
2025-07-14 21:01本頁(yè)面
【正文】 BH,00H MOV 52H,16H 。開機(jī)顯示HELLO！，說(shuō)明工作正常 MOV 54H,18H 。調(diào)用顯示程序，顯示顯緩區(qū)數(shù)據(jù)LP0: ACALL KEY 。判斷是否有鍵按下 SJMP LP0 LP1: ACALL CJH 。鍵值為00H轉(zhuǎn)到L0LP2: CJNE A,01H,LP3 SJMP L1 。鍵值為02H轉(zhuǎn)到L2LP4: CJNE A,03H,LP5 lJMP L3 。鍵值為04H轉(zhuǎn)到L4LP6: CJNE A,05H,LP7 SJMP L5 。鍵值為08H轉(zhuǎn)到L8LP8: CJNE A,08H,LP9 SJMP L8 。鍵值為09轉(zhuǎn)到L9LP10: CJNE A,0CH,LP11 SJMP L12 。鍵值為0DH轉(zhuǎn)到13LP12: CJNE A,07H,LP15 lJMP L14 。再轉(zhuǎn)LP0重新讀鍵L0: ACALL QBJ 。起步價(jià)調(diào)整，加1 MOV R1,30H CJNE R1,10,TPTP: JC TPP MOV 30H,00H TPP: ACALL QBJ 。起步價(jià)調(diào)整，減1 MOV R1,30H CJNE R1,1,TP11TP11: JNC TPP1 MOV 30H,9TPP1: ACALL QBJ 。調(diào)用QBGL，起步公里數(shù)顯示 AJMP LP0L8: INC 32H 。調(diào)整后顯示 lJMP LP0L9: DEC 32H 。轉(zhuǎn)LP0，重新讀鍵 L2: ACALL DANJIA 。單價(jià)調(diào)整 ADD A,10H 。BCD碼調(diào)整 MOV 35H,A MOV A,34H 。調(diào)整有進(jìn)位加1 DA A 。調(diào)整完，再次顯示單價(jià) LJMP LP0L13: MOV A,35H 。 CLR C SUBB A,10H JNC LLLL0 MOV A,090H SETB C DEC 34hLLLL0: ADD A,0 DA A MOV 35H,A MOV A,34H SUBB A,00H ADD A,0 DA A MOV 34H,A ACALL DANJIA 。轉(zhuǎn)LP0，重新讀鍵L3: SETB TR0 。復(fù)位，程序重新運(yùn)行L15: CPL TR0 。啟動(dòng)T0計(jì)數(shù)器，開T0中斷 MOV IE,82H SETB TR0 CLR TR1 LJMP LP0L17: SETB 30H 。顯示等待的時(shí)間 ACALL DIR LJMP LP0 L6: CPL 00H 。其中00H為標(biāo)志位，用來(lái)記憶 ACALL LC_XS 。顯示總金額 ACALL DIR LJMP LP0STFS: MOV R7,08H 。循環(huán)2次，作用為延時(shí)約8US CLR MOV R6,02HB3: DJNZ R6,B3 DJNZ R7,B1 RETSTJS: MOV R7,08H 。延時(shí)約10US MOV C, 。P1口作為輸入 MOV C, JC TP2 。 鍵盤指令 SETB 01H RETTP2: CLR 01H 。CS無(wú)效 MOV R6,0CH 。發(fā)送一字節(jié)子程序 MOV R6,06H 。接收一字節(jié)子程序 SETB RETDIR: MOV R5,08H 。52H為顯示緩沖區(qū)首址 MOV R1,97H 。CS有效， MOV R6,0CHD2: DJNZ R6,D2 。輸出指令碼 MOV R6,06HD3: DJNZ R6,D3 。查表指令 ACALL STFS 。延時(shí) SETB 。延時(shí) RETTAB0: DB 7EH,30H,6DH,79H,33H,5BH,5FH,70H,7FH,7BHTAB1: DB 0FEH,0B0H,0EDH,0F9H,0B3H,0DBH,0DFH,0F0H,0FFH,0FBHTAB2: DB 67H,0EH,37H,4FH,0EH,3DH,09H,00HCHE: MOV B,A 。用來(lái)提取一字節(jié)存儲(chǔ)的兩個(gè)BCD碼 ANL A,0FH MOV 42H,A MOV A,B ANL A,0FH MOV 41H,A RETBEG: CLR 。延時(shí)G0: DJNZ R6,G0 MOV A,0A4H ACALL STFS 。延時(shí)G1: DJNZ R6,G1 SETB 。起步價(jià)顯示，起步價(jià)存儲(chǔ)在30H,31H單元 ACALL CHE 。送入顯示緩沖區(qū),52H59H MOV 53H,1BH 。調(diào)用顯示子程序 RETQBGL: MOV A,32H 。送入顯示緩沖區(qū) MOV 53H,1BH 。調(diào)用顯示子程序 RETDANJIA: MOV A,34H 。送入顯示緩沖區(qū) MOV 53H,1BH 。調(diào)用顯示子程序 RETLC_XS: MOV A,36H 。送入顯示緩沖區(qū) MOV 53H,1AH 。調(diào)用顯示子程序 RETJE_XS: MOV A,39H 。送入顯示緩沖區(qū) MOV 53H,1AH 。調(diào)用顯示子程序 RETSHIJIAN: MOV IE,88H CLR TR0 SETB TR1 MOV A,3EH 。送入顯示緩沖區(qū) MOV 53H,1AH 。調(diào)用顯示子程序 RETCJH: MOV B,A 。00放項(xiàng)號(hào) MOV R7,0FH 。查表 MOVC A,A+PC CJNE A,B,CJH2 。LUC為T0中斷子程序 MOV A,38H ADD A,01H 。有進(jìn)位，往個(gè)位和十位進(jìn)位 DA A MOV 37H,A MOV A,36H ADDC A,00H 。39H－3BH單元存儲(chǔ)總金額 CLR C SUBB A,33H 。超過起步公里L(fēng)UC1 LJMP LUC2LUC1: MOV A,38H CJNE A,00H,LUC2 MOV A,35H 。有進(jìn)位，向總金額的個(gè)位和十位進(jìn)位 DA A MOV 3AH,A MOV A,39H ADDC A,00H 。檢查總路程或總金額的標(biāo)志位 LCALL LC_XS 。顯示總金額 LCALL DIR LP1111: RETIYY: MOV TH1,00H 。每有1個(gè)脈沖到來(lái)38H加1， DA A MOV 3CH,A MOV A,3DH ADDC A,00H 。檢查有無(wú)進(jìn)位，往百位進(jìn) DA A MOV 3EH,A MOV A,35H 。有進(jìn)位，向總金額的個(gè)位和十位進(jìn)位 DA A MOV 3AH,A MOV A,39H ADDC A,00H 。檢查總路程或總金額的標(biāo)志位 LCALL SHIJIAN 。顯示總金額 LCALL DIR LP11111: RETIEND附錄二 元件清單 元器件名型號(hào)數(shù)量7279最小系統(tǒng)板HD72791電阻1KΩ1電阻1電容2芯片NE5551電位器100K2電容10uf
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