【正文】 。檢測所按鍵是否已經(jīng)按下過并還在存儲單元 MOV A,R6 MOV R0,A RETNET1: DEC R0 CJNE R0,67H,NET2 MOV A,R6 MOV R0,A 。重裝存儲指針指向地址 MOV A,B MOV @R0,A 。存所按鍵的編碼 DEC R0 CJNE R0,67H,NET3 MOV R0,6FHNET3: RETAGAIN:POP ACC INC A CJNE A,8,NET RET。*************************************。顯示子程序。*****************************************DISP: MOV SCON,0 。串口方式０ CLR A MOV DPTR,TAB2 。個位數(shù)列表首地址 MOV A,@R1 MOVC A,@A+DPTR MOV SBUF,A 。輸出個位數(shù)到串口 JNB TI,$ 。一幀發(fā)送完清除中斷標(biāo)志 CLR TI CLR A MOV DPTR,TAB3 。十位數(shù)列表首地址 MOV A,@R1 MOVC A,@A+DPTR MOV SBUF,A 。輸出十位數(shù)到串口 JNB TI,$ CLR TI RET。********************************。復(fù)位子程序。*****************************RESET:CLR EA PUSH ACC PUSH PSW CLR TR1 CLR ET1 。關(guān)定時器T1 CLR 。關(guān)告警聲音 CJNE @R1,40H,AB1 ACALL DISP POP PSW POP ACC SETB EA RETIAB1: MOV @R1,40H 。當(dāng)前顯示床號不為０，則清0 DEC R1 CJNE R1,67H,AB2 MOV R1,6FHAB2: ACALL DISP 。顯示下一存儲單元的呼叫床號 ACALL SOUND ACALL T100MSD ACALL T100MSD ACALL T100MSD POP PSW POP ACC SETB EA RETI。************************。聲音子程序。**********************SOUND:PUSH PSW CJNE @R1,40H,XIANG 。判斷是否該發(fā)出告警聲音 POP PSW RETXIANG:SETB TR1 。啟動T1工作 SETB ET1 。允許T1中斷 POP PSW RET VOICE:DJNZ R2,EFB CPL MOV R2,05H 。重裝設(shè)計次數(shù)EFB: MOV TH1,3CH MOV TL1,0B0H 。重裝計數(shù)初值 RETI 。*****************************************************。列表3。***********************************************TAB1:DB 0FEH,0FDH,0FBH,0F7H,0EFH,0DFH,0BFH,7FHTAB2:DB 9FH,25H,0DH,99H,49H,41H,1FH,01H,09H,03H,9FH,25H,0DH,99H,49H,41H,1FH,01H,09H,03H,9FH,25H,0DH,99H,49H,41H,1FH,01H,09H,03H,9FH,25H,0DH,99H,49H,41H,1FH,01H,09H,03H,9FH,25H,0DH,99H,49H,41H,1FH,01H,09H,03H,9FH,25H,0DH,99H,49H,41H,1FH,01H,09H,03H,9FH,25H,0DH,99H,03HTAB3:DB 03H,03H,03H,03H,03H,03H,03H,03H,03H,9FH,9FH,9FH,9FH,9FH,9FH,9FH,9FH,9FH,9FH,25H,25H,25H,25H,25H,25H,25H,25H,25H,25H,0DH,0DH,0DH,0DH,0DH,0DH,0DH,0DH,0DH,0DH,99H,99H,99H,99H,99H,99H,99H,99H,99H,99H,49H,49H,49H,49H,49H,49H,49H,49H,49H,49H,41H,41H,41H,41H,41H,03H。***************************************。延時子程序。****************************************T10MSD:SETB RS0 MOV R3,12TM: MOV R5,128TM1: DJNZ R5,TM1 DJNZ R3,TM CLR RS0 RETT100MSD:MOV R3,200TM2: MOV R5,125TM3: DJNZ R5,TM3 DJNZ R3,TM2 RET END2．床號顯示電路測試程序 ORG 0000H AJMP START ORG 0003H MOV SP,70H MOV SCON,0 。串口方式０ MOV A,0START:PUSH ACC MOV DPTR,TAB2 MOVC A,@A+DPTR MOV SBUF,A JNB TI,$ CLR TI POP ACC PUSH ACC MOV DPTR,TAB3 MOVC A,@A+DPTR MOV SBUF,A JNB TI,$ CLR TI POP ACC INC AACALL T100MSDACALL T100MSDACALL T100MSDACALL T100MSDACALL T100MSDACALL T100MSDACALL T100MSDACALL T100MSDACALL T100MSDACALL T100MSDACALL T100MSDACALL T100MSD CJNE A,41H,START SJMP $TAB2:DB 9FH,25H,0DH,99H,49H,41H,1FH,01H,09H,03H,9FH,25H,0DH,99H,49H,41H,1FH,01H,09H,03H,9FH,25H,0DH,99H,49H,41H,1FH,01H,09H,03H,9FH,25H,0DH,99H,49H,41H,1FH,01H,09H,03H,9FH,25H,0DH,99H,49H,41H,1FH,01H,09H,03H,9FH,25H,0DH,99H,49H,41H,1FH,01H,09H,03H,9FH,25H,0DH,99H,03HTAB3:DB 03H,03H,03H,03H,03H,03H,03H,03H,03H,9FH,9FH,9FH,9FH,9FH,9FH,9FH,9FH,9FH,9FH,25H,25H,25H,25H,25H,25H,25H,25H,25H,25H,0DH,0DH,0DH,0DH,0DH,0DH,0DH,0DH,0DH,0DH,99H,99H,99H,99H,99H,99H,99H,99H,99H,99H,49H,49H,49H,49H,49H,49H,49H,49H,49H,49H,41H,41H,41H,41H,41H,03HT100MSD:MOV R4,200TM2: MOV R5,125TM3: DJNZ R5,TM3 DJNZ R4,TM2 RET END3．鍵盤掃描及鍵值處理的測試程序 ORG 0000HTEST:MOV P0,0 MOV P2,0FFH MOV A,P2 CJNE A,0FFH,HAVE AJMP TESTHAVE:ACALL T10MSD MOV R4,0 。行碼０為1行，8為2行，16為3行 MOV A,0FEH 。檢測第一行鍵盤NEXT:MOV B,A 。暫存行掃描碼 MOV P2,0FFH MOV P0,A MOV A,P2 。讀鍵盤 CJNE A,0FFH,YES 。不等則表示該行有按鍵按下 MOV A,R4 ADD A,08H 。加8為下一行編碼 MOV R4,A MOV A,B RL A 。掃描下一行 CJNE A,0FEH,NEXT 。掃描至最后一行，沒發(fā)現(xiàn)則重新掃描狀態(tài) AJMP TESTYES: MOV A,P2 MOV B,A MOV DPTR,TAB1 MOV A,0NET: PUSH ACC MOVC A,@A+DPTR CJNE A,B,AGAIN POP ACC ADD A,R4 PUSH ACC MOV DPTR,TAB2 MOVC A,@A+DPTR MOV SBUF,A JNB TI,$ CLR TI POP ACC PUSH ACC MOV DPTR,TAB3 MOVC A,@A+DPTR MOV SBUF,A JNB TI,$ CLR TI POP ACC AJMP TESTAGAIN:POP ACC INC A CJNE A,8,NET AJMP TESTTAB1:DB 0FEH,0FDH,0FBH,0F7H,0EFH,0DFH,0BFH,7FHTAB2:DB 9FH,25H,0DH,99H,49H,41H,1FH,01H,09H,03H,9FH,25H,0DH,99H,49H,41H,1FH,01H,09H,03H,9FH,25H,0DH,99H,49H,41H,1FH,01H,09H,03H,9FH,25H,0DH,99H,49H,41H,1FH,01H,09H,03H,9FH,25H,0DH,99H,49H,41H,1FH,01H,09H,03H,9FH,25H,0DH,99H,49H,41H,1FH,01H,09H,03H,9FH,25H,0DH,99H,03HTAB3:DB 03H,03H,03H,03H,03H,03H,03H,03H,03H,9FH,9FH,9FH,9FH,9FH,9FH,9FH,9FH,9FH,9FH,25H,25H,25H,25H,25H,25H,25H,25H,25H,25H,0DH,0DH,0DH,0DH,0DH,0DH,0DH,0DH,0DH,0DH,99H,99H,99H,99H,99H,99H,99H,99H,99H,99H,49H,49H,49H,49H,49H,49H,49H,49H,49H,49H,41H,41H,41H,41H,41H,03HT10MSD:SETB RS0 MOV R4,12TM: MOV R5,128TM1: DJNZ R5,TM1 DJNZ R4,TM CLR RS0 RETEND ORG 0000H AJMP START ORG 0003H AJMP RESET ORG 0030HSTART:MOV SP,70H SETB IT0 SETB EX0 SETB EA 。邊沿觸發(fā)方式，允許中斷，開中斷開關(guān) MOV R7,08H MOV R0,6CH 。所按鍵編碼存儲單元首地址 MOV 6FH,02H MOV 6EH,03H MOV 6DH,16HLOOP: MOV @R0,40H 。清０ DEC R0 DJNZ R7,LOOP MOV