2、P1口作输出口，接8只发光二极管，编写程序，使发光二极管循环点亮。
ORG 0000H LJMP START ORG 0500H
ASCTAB:DB 30H,31H,32H,33H,34H,35H,36H,37H,38H,39H START:MOV P1,#0EH MOV R0,#30H MOV R6,#0AH
MOV DPTR,#ASCTAB N:MOV A,#00H MOVC A,@A+DPTR MOV @R0,A MOV P0,@R0
MOV TMOD,#01H MOV TH0,#01H MOV TL0,#01H SETB TR0 L:JNB TF0,L CLR TF0 INC DPTR INC R0 DJNZ R6,N LJMP START END
ORG 0000H SJMP START
START:MOV P1,#0EH MOV A,#0FEH S:MOV P0,A MOV TMOD,#01H MOV TH0,#01H MOV TL0,#01H SETB TR0 L:JNB TF0,L CLR TF0 RL A SJMP S
END
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