基于单片机点对点通信设计

基于单片机点对点通信设计内容摘要：

08 MOV DPTR ,TAB MOV A,50H ANL A,0FH MOVC A,@A+DPTR LCALL W08 POP ACC RET。 键盘 SCAN SCAN: MOV P3,0FFH CLR MOV A,P3 ANL A,0FH XRL A,0FH JZ NOKEY1 LCALL DELY10MS MOV A,P3 ANL A,0FH XRL A,0FH JZ NOKEY1 MOV A,P3 ANL A,0FH SETB CJNE A,0EH,NK1 MOV KEYBUF,0 LJMP DK1A NK1: CJNE A,0DH,NK2 MOV KEYBUF,4 LJMP DK1A NK2: CJNE A,0BH,NK3 10 MOV KEYBUF,8 LJMP DK1A NK3: CJNE A,07H,DK1A MOV KEYBUF,12。 SETB DK1A: MOV A,P3。 等待释放 ANL A,0FH XRL A,0FH JNZ DK1A NK4: LJMP SCA NOKEY1: MOV P3,0FFH CLR MOV A,P3 ANL A,0FH XRL A,0FH JZ NOKEY2 LCALL DELY10MS MOV A,P3 ANL A,0FH XRL A,0FH JZ NOKEY2 MOV A,P3 ANL A,0FH SETB CJNE A,0EH,NK5 MOV KEYBUF,1 LJMP DK1A NK5: CJNE A,0DH,NK6 MOV KEYBUF,5 LJMP DK1A NK6: CJNE A,0BH,NK7 MOV KEYBUF,9 LJMP DK1A NK7: CJNE A,07H ,DK1A MOV KEYBUF,13。 CLR。 LJMP DK1A NOKEY2: MOV P3,0FFH CLR MOV A,P3 ANL A,0FH XRL A,0FH 11 JZ NOKEY3 LCALL DELY10MS MOV A,P3 ANL A,0FH XRL A,0FH JZ NOKEY3 MOV A,P3 ANL A,0FH SETB CJNE A,0EH,NK9 MOV KEYBUF,2 LJMP DK1A NK9: CJNE A,0DH,NK10 MOV KEYBUF,6 LJMP DK1A NK10: CJNE A,0BH,NK11 MOV KEYBUF,10 LJMP DK1A NK11: CJNE A,07H,SCA MOV KEYBUF,14 LJMP DK1A NOKEY3: MOV P3,0FFH CLR MOV A,P3 ANL A,0FH XRL A,0FH JZ SCA LCALL DELY10MS MOV A,P3 ANL A,0FH XRL A,0FH JZ SCA MOV A,P3 ANL A,0FH SETB CJNE A,0EH,NK13 MOV KEYBUF,3 LJMP DK1A NK13: CJNE A,0DH,NK14 MOV KEYBUF,7 LJMP DK1A NK14: CJNE A,0BH,NK15 MOV KEYBUF,11 12 LJMP DK1A NK15: CJNE A,07H,SCA MOV KEYBUF,15 LJMP DK1A SCA: JNB ,L1。 判断是否有键按下 CLR。 有键按下 MOV R5,KEYBUF。 把键值存入 R5 中 CJNE R5,10,SCAN1。 清零键 MOV 50H,00H MOV 51H,00H MOV 52H,00H MOV R0,50H CLR。 显示键值 LJMP L1 SCAN1: CJNE R5,11,SCAN2。 发送数据给乙机键。