課程設(shè)計（論文）-基于mcs-51單片機的可調(diào)頻率方波(文件)
【正文】 H CJNE A,2,NEXT23 ANL KEYSTU,00H JMP EXIT2NEXT23: CJNE A,4,NEXT24 SETB KEYVALED JMP EXIT2NEXT24: CJNE A,5,EXIT2ORL KEYSTU,07HEXIT2: POP ACC POP PWERETIKEYSCAN: MOV R7,4 MOV R5,0 MOV R6,11110111BOP1: MOV A,R6 RL A MOV R6,A MOV P3,A MOV A,P3 ANL A,0FH RL A,0FH JNZ NEXT31 INC R5 DJNZ R7,LOOP1 SJMP EXIT3NEXT31: JNE ,NEXT32 MOV R4,0 SJMP NEXT35 NEXT32:JNB ,NEXT33 MOV R4,1 SJMP NEXT35NEXT33:JNB ,NEXT34 MOV R4,2 SJMP NEXT35NEXT 34:MOV R4,3NEXT35: MOV A,R4 RL A RL A ADD A,R5 MOV DPTP,KEYTAB MOVC A,A+DPTP MOV KEYNAME,AEXIT3: RETDISPLAY: MOV LEDSP,00H LCALL BIN T0BCD LCALL BCD T0SEG LJMP LOOPTIME R0:PUSH PSW PUSH Acc SETB RS0 CLR RS1 MOV TH0,0E4A MOV TL0,0A8H MOV ANL A,04H CJNE A,0,NEXT11 MOV P2,00001D00B ADD ASEGBUF MOV R0,A MOV P0,A MOV P0,R0 CJMP EXIT1NEXT11:CJNE A,2,NEXT12 MOV P2,00000100B ADD A,SEGBUF MOV R0,A MOV P0,R0 LKMP EXIT1NEXT12: CJNE A,1,NEXT13 MOV P2,00000010B ADD A,SEGBUF MOV R0,A MOV P0,R0 LJMP EXIT1NEXT13: MOV P2,300000001B AD A,SEGBUF MOV R0,A MOV P0,R0EXIT1: INC LEDSP MO
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鄂ICP備17016276號-1