【導(dǎo)讀】測量與儀器帶來了巨大的沖擊和革命性的影響。常規(guī)的測試儀器儀表和控制裝置被更先進(jìn)。的自動(dòng)化程度得以顯著提高。為主,測量0～電子秤，隨時(shí)可改變上限閾值，并達(dá)到閾值報(bào)警的功能。其中測量電路中最主要的元器件就是電阻應(yīng)變式傳感器。ADC0809A/D轉(zhuǎn)換的作用是把模擬信號(hào)轉(zhuǎn)變成數(shù)字信號(hào)，進(jìn)行模數(shù)轉(zhuǎn)換，然

　　

【正文】 ANL A,0FH MOV DPTR,BCD_CODE 。；留下低四位單元 MOVC A,@A+DPTR 。；取得 ASCII 碼 MOV TEMP2,A 。 后加 POP ACC POP DPL POP DPH RET BCD_CODE:DB 3FH,06H,5BH,4FH,66H DB 6DH,7DH,07H,7FH,6FH DB 77H,7CH,39H,5EH,79H,71H,73H,00H,40H WRITE_LED:PUSH DPH PUSH DPL PUSH ACC MOV R0,5CH MOV R3,0F7H MOV A,R3 鄭州大學(xué)西亞斯國際學(xué)院 數(shù)字電子秤設(shè)計(jì) 22 AGAIN:MOV DPTR,K8155A MOVX @DPTR,A MOV A,@R0 MOV DPTR,K8155B MOVX @DPTR,A LCALL DELAY01 INC R0 MOV A,R3 JNB ,OUT RR A MOV R3,A AJMP AGAIN OUT:POP ACC POP DPL POP DPH RET SET_KEY:MOV R7,00H MOV R6,00H MOV R5,00H LCALL READ_KEY1 MOV A,B CJNE A,04H,END_ST MOV 5FH,76H MOV 5EH,00H MOV 5DH,00H MOV 5CH,00H LCALL WRITE_LED SETH:LCALL READ_KEY1 鄭州大學(xué)西亞斯國際學(xué)院 數(shù)字電子秤設(shè)計(jì) 23 MOV A,B CJNE A,0FFH,GGG LCALL WRITE_LED LJMP SETH GGG:CJNE A,05H,SET_L MOV A,R7 CJNE A,06H,SET_H MOV A,00H MOV R7,A SET_H:MOV SET_VH,R7 MOV DPTR,BCD_CODED MOVC A,@A+DPTR MOV 5EH,A LCALL WRITE_LED INC R7 LJMP SETH SET_L:CJNE A,06H,SET_LL MOV A,R6 CJNE A,0AH,SET_L1 MOV A,00H MOV R6,A SET_L1:MOV SET_VL1,R6 MOV DPTR,BCD_CODE MOVC A,@A+DPTR MOV 5DH,A LCALL WRITE_LED INC R6 LJMP SETH SET_LL:CJNE A,07H,KEYJS 鄭州大學(xué)西亞斯國際學(xué)院 數(shù)字電子秤設(shè)計(jì) 24 MOV A,R5 CJNE A,0AH,SET_LL1 MOV A,00H MOV R5,A SET_LL1:MOV SET_VL2,R5 MOV DPTR,BCD_CODE MOVC A,@A+DPTR MOV 5CH,A LCALL WRITE_LED INC R5 LJMP SETH KEYJS:MOV A,SET_VL1 SWAP A ORL A,SET_VL2 MOV SET_VL,A END_ST:RET READ_KEY1:LCALL READ_KEY JNZ INK1 MOV B,0FFH RET INK1:LCALL DELAY10 LCALL DELAY10 LCALL READ_KEY JNZ INK2 MOV B,0FFH 鄭州大學(xué)西亞斯國際學(xué)院 數(shù)字電子秤設(shè)計(jì) 25 RET INK2:LCALL GETVAL LCALL KEYSF RET READ_KEY:MOV DPTR,K8155A MOV A,00H MOVX @DPTR,A INC DPTR INC DPTR MOVX A,@DPTR CPL A ANL A,03H LCALL WRITE_LED RET GETVAL:MOV R2,0FEH MOV R4,00H COLUM: MOV DPTR,K8155A MOV A,R2 MOVX @DPTR,A INC DPTR INC DPTR MOVX A,@DPTR JB ,LONE MOV A,00H AJMP KCODE LONE:JB ,NEXT MOV A,04H 鄭州大學(xué)西亞斯國際學(xué)院 數(shù)字電子秤設(shè)計(jì) 26 KCODE:ADD A,R4 MOV B,A LCALL WRITE_LED RET NEXT:INC R4 MOV A,R2 JNB ,KERR RL A MOV R2,A AJMP COLUM KERR:MOV B,0FFH LCALL WRITE_LED RET KEYSF:LCALL WRITE_LED MOV DPTR,K8155A MOV A,00H MOVX @DPTR,A INC DPTR INC DPTR MOVX A,@DPTR CPL A ANL A,03H CJNE A,00H,KEYSF RET ARM:CLR C MOV R0,40H 鄭州大學(xué)西亞斯國際學(xué)院 數(shù)字電子秤設(shè)計(jì) 27 MOV A,@R0 SUBB A,SET_VH JC END_CON_T INC R0 MOV A,@R0 SUBB A,SET_VL JC END_CON_T BAIDOWN_T:CLR SETB LCALL DELAY10 END_CON_T:SETB CLR RET OFF_LED: MOV 5FH,00H MOV 5EH,00H MOV 5DH,00H MOV 5CH,00H LCALL WRITE_LED RET INIT_8155: PUSH DPL PUSH DPH PUSH ACC MOV DPTR,ML8155 MOV A,03H MOVX @DPTR,A LCALL OFF_LED POP ACC 鄭州大學(xué)西亞斯國際學(xué)院 數(shù)字電子秤設(shè)計(jì) 28 POP DPH POP DPL RET DELAY: PUSH DTIMER1 PUSH DTIMER0 DELAY1:MOV DTIMER0,125 DELAY2:NOP NOP DJNZ DTIMER0,DELAY2 DJNZ DTIMER1,DELAY1 POP DTIMER0 POP DTIMER1 RET DELAY01:NOP PUSH DTIMER1 MOV DTIMER1,01H LCALL DELAY POP DTIMER1 RET DELAY10:NOP PUSH DTIMER1 MOV DTIMER1,10 LCALL DELAY POP DTIMER1 RET end