單片機(jī)課程設(shè)計(jì)擴(kuò)展時(shí)鐘系統(tǒng)實(shí)驗(yàn)-文庫(kù)吧在線文庫(kù)
【正文】 MOV DPTR,0E101H MOV A,R7 MOVX DPTR,A MOV A,12H CLR C RRC A MOV 12H,A MOV DPTR,0E103H MOVX A,DPTR MOV R7,A MOV A,R7 CPL A MOV R7,A MOV A,R7 ANL A,0FH MOV 14H,A DEC 13H MOV R7,13H MOV A,R7 JZ Key1 MOV A,14H JZ Key2Key1 : MOV A,14H JZ GetKey6 MOV A,13H ADD A,ACC ADD A,ACC MOV 13H,A MOV A,14H JNB ,GetKey1 INC 13H SJMP GetKey3GetKey1: MOV A,14H JNB ,GetKey2 INC 13H INC 13H SJMP GetKey3GetKey2: MOV A,14H JNB ,GetKey3 MOV A,03H ADD A,13H MOV 13H,AGetKey3: MOV DPTR,0E101H CLR A MOVX DPTR,AGetKey4: MOV R7,0AH LCALL Delay LCALL TestKey MOV A,R7 JNZ GetKey4 MOV R7,13H MOV A,R7 MOV DPTR,KeyTable MOVC A,A+DPTR MOV R2,A RETGetKey6: MOV R2,0FFH RETWaitRelease: mov dptr, OUTBIT 。 從左邊開(kāi)始顯示Loop: mov dptr, OUTBIT mov a, 0 movx dptr, a 。 位控制口CLK164 equ 0e102h 。從“接線圖案”中看出，DS12887的/CS腳已連接U17譯碼器的YS7腳，于是可知DS12887的地址空間為0FE00H0
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