【正文】 ===============================。顯示區(qū) BCD 碼溫度值刷新子程序。===========================================================DISPBCD: MOV A,TEMPLC ANL A,0FH MOV 70H,A 。小數(shù)位 MOV A,TEMPLC SWAP A ANL A,0FH MOV 71H,A 。個(gè)位 MOV A,TEMPHC ANL A,0FH MOV 72H,A 。十位 MOV A,TEMPHC SWAP A ANL A,0FH MOV 73H,A 。百位 MOV A,TEMPHC ANL A,0F0H CJNE A,010H,DISPBCD0 SJMP DISPBCD2DISPBCD0: MOV A,TEMPHC ANL A,0FH JNZ DISPBCD2 。十位數(shù)是0 MOV A,TEMPHC SWAP A ANL A,0FH MOV 73H,0AH 。符號(hào)位不顯示 MOV 72H,A 。十位數(shù)顯示符號(hào)DISPBCD2: RET。***************************************************************。 溫度顯示子程序。***************************************************************。顯示數(shù)據(jù)在70H － 73H 單元內(nèi)，用4位共陽數(shù)碼管顯示，P0口輸出段碼數(shù)據(jù)。P2 口作掃描控制，每個(gè) LED 數(shù)碼管亮 2MS 時(shí)間再逐位循環(huán)。DISP1: MOV R1,70H 。指向顯示數(shù)據(jù)首址 MOV R5,7FH 。掃描控制字初值PLAY: MOV P0,0FFH MOV A,R5 。掃描字放入A MOV P2,A MOV A,@R1 。取顯示數(shù)據(jù)到A MOV DPTR,TAB 。取段碼表地址 MOVC A,@A+DPTR 。查顯示數(shù)據(jù)對(duì)應(yīng)段碼 MOV P0,A 。段碼放入P0口 MOV A,R5 JB ,LOOP5 。小數(shù)點(diǎn)處理 CLR LOOP5: LCALL DL_MS 。顯示2MS INC R1 。指向下一個(gè)地址 MOV A,R5 。放回 R5 內(nèi) JNB ,ENDOUT 。=0時(shí)一次顯示結(jié)束 RR A 。A 中數(shù)據(jù)循環(huán)左移 MOV R5,A 。放入 R5 中 AJMP PLAY 。跳回 PLAY 循環(huán)ENDOUT: MOV P0,0FFH 。一次顯示結(jié)束，P0口復(fù)位 MOV P2,0FFH 。P2口復(fù)位 RETTAB: DB 0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,90H,0FFH,0BFH,0C7H,89H。 “0 “1 “2 “3 “4“5“6“7“8“9“滅 “ “L”“HDL_MS: MOV R6,0AH 。2MS延時(shí)程序，LED 顯示程序用DL1: MOV R7,64HDL2: DJNZ R7,DL2 DJNZ R6,DL1 RET。******************************************************。單字節(jié)十六進(jìn)制轉(zhuǎn) BCD。******************************************************HEX2BCD1: MOV B,064H DIV AB MOV R7,A MOV A,0AH XCH A,B DIV AB SWAP A ORL A,B RET。===============================================。報(bào)警值 TH、TL 數(shù)據(jù)轉(zhuǎn)換。===============================================ALERT_TL: MOV 79H,0CH MOV 78H,0BH MOV A,TEMP_TL MOV R0,77H MOV B,064H DIV AB CJNE A,01H,ALERT_TL1 MOV @R0,A JMP ALERT_TL2ALERT_TL1: MOV A,0BH 。顯示“－” MOV @R0,AALERT_TL2: MOV A,0AH XCH A,B DIV AB DEC R0 MOV @R0,A MOV 7DH,A DEC R0 MOV @R0,B MOV 7EH,B RET。ALERT_TH: MOV 79H,0DH MOV 78H,0BH MOV A,TEMP_TH MOV R0,77H MOV B,064H DIV AB CJNE A,01H,ALERT_TH1 MOV @R0,A JMP ALERT_TH2ALERT_TH1: MOV A,0BH 。顯示“－” MOV @R0,AALERT_TH2: MOV A,0AH XCH A,B DIV AB DEC R0 MOV @R0,A MOV 7DH,A DEC R0 MOV @R0,B MOV 7EH,B RET。===============================================。動(dòng)作溫度設(shè)定值顯示子程序。===============================================ALERT_PLAY: MOV R1,75H 。指向顯示數(shù)據(jù)首址 MOV R5,7FH 。掃描控制字初值A(chǔ)_PLAY: MOV P0,0FFH MOV A,R5 。掃描字放入A MOV P2,A MOV A,@R1 。取顯示數(shù)據(jù)到A MOV DPTR,ALERT_TAB 。取段碼表地址 MOVC A,@A+DPTR 。查顯示數(shù)據(jù)對(duì)應(yīng)段碼 MOV P0,A 。段碼放入P0口 LCALL DL_MS1 。顯示2MS INC R1 。指向下一個(gè)地址 MOV A,R5 JNB ,ENDOUT1 RR A 。A 中數(shù)據(jù)循環(huán)左移 MOV R5,A 。放入 R5 中 AJMP A_PLAY 。跳回 PLAY 循環(huán)ENDOUT1: MOV P0,0FFH 。一次顯示結(jié)束，P0口復(fù)位 MOV P2,0FFH 。P2口復(fù)位 RETALERT_TAB: DB 0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,90H,0FFH,0BFH,0C7H,89H。共陽段碼表 “0 “1 “2 “3 “4“5“6“7“8“9“滅 “DL_MS1: MOV R6,0AH 。2MS延時(shí)程序，LED 顯示程序用ADL1: MOV R7,64HADL2: DJNZ R7,ADL2 DJNZ R6,ADL1 RET。===============================================。蜂鳴器響一聲子程序。===============================================BEEP_BL: MOV R6,100 BL2: CALL DEX1 CPL BEEP 。對(duì) 取反 DJNZ R6,BL2 MOV R5,10 CALL DELAY RET DEX1: MOV R7,180 DE2: NOP DJNZ R7,DE2 RETDELAY: 。(R5)*延時(shí)10MS MOV R6,50 DEL1: MOV R7,100 DJNZ R7,$ DJNZ R6,DEL1 DJNZ R5,DELAY RET。================================================== END