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【正文】 A,0FFH,KEYVAL1 SETB KEYX1 CLR KEYX2 MOV A,KEYY CJNE A,0FFH,KEYVAL2 SETB KEYX2 CLR KEYX3 MOV A,KEYY CJNE A,0FFH,KEYVAL3 LJMP KEYOUT 。 KEYVAL0: MOV R2,00H LJMP KEYVAL4 。 KEYVAL1: MOV R2,08H LJMP KEYVAL4 。 KEYVAL2: MOV R2,10H LJMP KEYVAL4 。 KEYVAL3: MOV R2,18H LJMP KEYVAL4 。 KEYVAL4: MOV DPTR,KEYVALTAB MOV B,A CLR A MOV R0,A KEYVAL5: MOV A,R0 SUBB A,08H JNC KEYOUT MOV A,R0 MOVC A,@A+DPTR INC R0 CJNE A,B,KEYVAL5 DEC R0 MOV A,R0 ADD A,R2 MOV B,A RL A ADD A,B MOV DPTR,KEYFUNTAB 34 JMP @A+DPTR KEYFUNTAB: LJMP KEYFUN00 LJMP KEYFUN01 LJMP KEYFUN02 LJMP KEYFUN03 LJMP KEYFUN04 LJMP KEYFUN05 LJMP KEYFUN06 LJMP KEYFUN07 KEYVALTAB DB 0FEH,0FDH,0FBH,0F7H,0EFH,ODFH,0BFH,7FH。 RET 。 KEYFUN00: MOV A,02H LJMP REMOTE RET 。 KEYFUN01: MOV A,03H LJMP REMOTE RET 。 KEYFUN02: MOV A,04H LJMP REMOTE RET 。 KEYFUN03: MOV A,05H LJMP REMOTE RET 。 KEYFUN04: MOV A,06H LJMP REMOTE RET 。 KEYFUN05: MOV A,07H LJMP REMOTE RET 。 KEYFUN06: MOV A,08H LJMP REMOTE RET 。 KEYFUN07: MOV A,09H LJMP REMOTE RET 。 35 編碼發(fā)射程序 REMOTE: MOV R1,A LJMP OUT3 OUT: MOV R0,55H OUT1: SETB ET1 SETB TR1 NOP NOP NOP NOP NOP DJNZ R0,OUT1 MOV R0,32H OUT2: CLR TR1 CLR ET1 CLR NOP NOP NOP NOP NOP DJNZ R0,OUT2 DJNZ R1,OUT LCALL DL500MS RET OUT3: MOV R0,0FFH LJMP OUT1 延時(shí) 513μ S DELAY: MOV R2,0FFH DELAY1: DJNZ R2,DELAY1 RET 10ms延時(shí)程序 DL10MS: MOV R3,14H DL10MS1: LCALL DELAY DJNZ R3,DL10MS1 RET 。 END 主程序和中斷程序入口 ORG 0000H LJMP START ORG 0003H LJMP INTEX0 36 ORG 000BH RETI ORG 0013H RETI ORG 001BH RETI ORG 0023H RETI ORG 002BH RETI 初始化程序 CLEARMEMIO: CLR A DEC A MOV P0,A MOV P1,A MOV P2,A MOV P3,A CLEARMEM: MOV IE,00H SETB EX0 SETB EA RET 。 主程序 START: LCALL CLEARMEMIO LCALL LOOP 。 MAIN: JB ,MAIN LCALL DLX CLR LCALL DELAY SETB LJMP MAIN NOP NOP LJMP STAR INTEX0: CLR EX0 JNB ,READ1 READOUTT0: SETB EX0 RET1 。 READ1: CLR A MOV DPH,A MOV DPL,A HARD1: JB ,HARD11 37 INC DPTR NOP NOP AJMP HARD1 HARD11: MOV A,DPH JZ READOUTT0 CLA A READ11: INC A READ12: JNB ,READ12 MOV R1,06H READ13: JNB ,READ13 DEC A DEC A JZ FUN0 DEC A JZ FUN1 DEC A JZ FUN2 DEC A JZ FUN3 DEC A JZ FUN4 DEC A JZ FUN5 DEC A JZ FUN6 DEC A JZ FUN7 NOP NOP LJMP READOUTT0 。 FUN0: CPL LJMP READOUTTP FUN1: CPL LJMP READOUTTP FUN2: CPL LJMP READOUTTP FUN3: CPL LJMP READOUTTP 38 FUN4: CPL LJMP READOUTTP FUN5: CPL LJMP READOUTTP FUN6: CPL LJMP READOUTTP FUN7: CPL LJMP READOUTTP RET。 延時(shí)程序 DELAY: MOV R0,OFFH DELAY1: DJNZ