【導(dǎo)讀】控參數(shù)進(jìn)行控制已成為當(dāng)今的主流。本文介紹了數(shù)字溫度測(cè)量及自動(dòng)控制系統(tǒng)的設(shè)計(jì)。它的主要組成部分有：AT89C51單片機(jī)、溫度傳感器、鍵盤與顯示。它可以實(shí)時(shí)的顯示和設(shè)定溫度，實(shí)現(xiàn)對(duì)溫度的自動(dòng)控制。本設(shè)計(jì)對(duì)溫度的控制有方便、簡(jiǎn)單的特點(diǎn)，從而大幅提高了被控溫度的技術(shù)指標(biāo)。

　　

【正文】 LL ANSW RETI PAN: CJNE A,12,SAO RETI 。顯示函數(shù)部分，可供調(diào)用 DIS_CUR_OFF: MOV R0,0CH LCALL DIS_CMD_WRT RET DIS_CUR_ON: MOV R0,0EH LCALL DIS_CMD_WRT RET CHK_BUSY_FLG: MOV P0,0FFH CLR D2RS NOP NOP NOP LCALL DISPLAY_RD JB ,CHK_BUSY_FLG RET CLEAR_DIS: MOV R0,01H LCALL DIS_CMD_WRT RET DIS_CMD_WRT: LCALL CHK_BUSY_FLG MOV P0,R0 CLR D2RS NOP NOP NOP LCALL DISPLAY_WRT RET DIS_DATA_WRT: LCALL CHK_BUSY_FLG CJNE A,10H,DIS_DAT_WRT1 MOV P0,0C0H 。1100,00000 行起始地址為 40 CLR D2RS NOP NOP NOP LCALL DISPLAY_WRT DIS_DAT_WRT1: MOV P0,R0 SETB D2RS NOP NOP NOP LCALL DISPLAY_WRT RET DISPLAY_WRT: CLR D2RW NOP NOP NOP SETB D2E NOP NOP NOP CLR D2E NOP NOP NOP RET DISPLAY_RD: SETB D2RW NOP NOP NOP SETB D2E NOP NOP NOP MOV A,P0 NOP NOP NOP CLR D2E NOP NOP NOP RET DIS_DATA_RD: LCALL CHK_BUSY_FLG MOV P0,0FFH SETB D2RS LCALL DISPLAY_RD RET 。鍵盤程序，出口： A 為按鍵值 01H： 0 無鍵按下 1 有鍵按下 KEY: MOV KEYPORT,0FH MOV A,KEYPOR CJNE A,0FH,KEYDOWN MOV A,0FFH RET KEYDOWN: LCALL DELAY43MS MOV KEYPORT,0FH MOV A,KEYPORT CJNE A,0FH,KEYDOWN_YES MOV A,0FFH RET KEYDOWN _YES: MOV B,A MOV KEYPORT,0F0H MOV A,KEYPORT ORL A,B PUSH 30H MOV 30H,A MOV R3,10H MOV DPTR,KEYVALUE NEXT_KEY: MOV A,R3 MOVC A,@a+dptr CJNE A,30h,NEXTKEYVALUE DEC R3 POP 30H WAITKEY_F: MOV KEYPORT,0FH MOV A,KEYPORT CJNE A,0FH, WAITKEY_F MOV A,R3 SETB 01H RET NEXTKEYVALUE: DJNZ R3,NEXT_KEY DEC R3 POP 30H WAITKEY_FREE: MOV KEYPORT,0FH MOV A,KEYPORT CJNE A,0FH, WAITKEY_FREE MOV A,R3 SETB 01H RET KEYVALUE: DB 0FFH,7EH,7DH,7BH,77H,0BEH,0BDH,0BBH,0B7H,0DEH,0DDH,0DBH,0D7H,0EEH,0EDH,0EBH,0E7H DELAY43MS: PUSH A MOV A,R3 PUSH A MOV A,R2 PUSH A MOV R3,43 DELAY: MOV R2,0FAH LOOP: NOP 。內(nèi)層循環(huán)為 1MS NOP DJNZ R2,LOOP DJNZ R3, DELAY POP A MOV R2,A POP A MOV R3,A POP A RET 。確認(rèn)是否修改溫度設(shè)定 ASK: MOV R0,01H 。清屏并置地址計(jì)數(shù)器 AC 為 0 LCALL DIS_CMD_WRT MOV 40H,0 ZDZ: MOV DPTR,LINE MOV A,40H MOVC A,@A+DPTR MOV R0,A LCALL DIS_DATA_WRT INC 40H MOV A,40H MOVC A,@A+DPTR CJNE A,00H,ZDZ RET LINE: DB ARE YOU SURE CHANGE T(Y/N)?,00H ANSW: MOV R6,42H MOV R7,43H MOV R0,01H LCALL DIS_CMD_WRT MOV R0,44H CALL DIS_DATA_WRT MOV R0,6FH CALL DIS_DATA_WRT MOV R0,77H CALL DIS_DATA_WRT MOV R0,6EH CALL DIS_DATA_WRT MOV R0,3AH CALL DIS_DATA_WRT MOV 40H,0 CLR 00H JMP SAO1 GAI: MOV R0,0FEH CALL DIS_DATA_WRT MOV R0,55H CALL DIS_DATA_WRT MOV R0,70H CALL DIS_DATA_WRT MOV R0,3AH CALL DIS_DATA_WRT MOV 40H,0 SAO1: CLR 01H LCALL KEY JNB 01H,SAO1 MOV R1,A MOV B,10 DIV AB JZ NEXT2 MOV A,A1 CJNE A,11,XU JB 00H,DOWN MOV 42H,40H CPL 00H JMP GAI DOWN: MOV 43H,40H RETI XU: CJNE A,12,SAO1 MOV 42H,R6 MOV 43H,R7 RETI NEXT2: MOV A,R1 ADD A,30H MOV R0,A LCALL DIS_DATA_WRT MOV A,R1 XCH A,40H MOV B,10 MUL AB NOP CLR DQ CLR C WR1: CLR DQ MOV R3,6 DJNZ R3,$ RR R4,2 R1,36H 。 低位存入 36H(TEMPER_L),高位存入 35H(TEMPER_ NOP NOP SETB DQ MOV R3,7 DJNZ R3,$ MOV C,DQ MOV R3,23 DJNZ R3,$ RRC A DJNZ R2,RE01 MOV @R1,A