查表指令
ORG 0000H SJMP START ORG 0030H START: MOV SP,#60H MOV P1,#0FFH MAIN: MOV DPTR,#TAB MOV A,#01H MOVC A,@A+DPTR MOV P1, A JMP $ TAB: DB 00H,01H,02H,04H,08H,10H END |
查表指令示例程序二
ORG 0000H SJMP START ORG 0030H START: MOV SP,#60H MOV P0,#0FFH MOV R2,#00H MAIN: MOV A,R2 MOV DPTR,#TAB MOVC A,@A+DPTR MOV P0,A INC R2 CALL DELAY CJNE R2,#08H,MAIN ;R2不等于#08H,跳转至MAIN MOV R2,#00H SJMP MAIN DELAY: MOV R0,#0FFH D2: MOV R1,#255 D1: DJNZ R1,D1 DJNZ R0,D2 RET TAB: DB 0FEH,00H,01H,02H,03H,04H,05H,06H END |