START: MOV DPTR,# 7FFFH MOV A,#0Dl H MOVX DPTR,A WAIT: MOVX A,＠DPTR JB ACC. 7,WAIT MOV A,#2AH MOVX DPTR,A MOV A,#00H MOVX DPTR,A MOV R0,#30H MOV R7,#08H MOV A,#90H MOVX @DPTR,A MOV DPTR,#7FFEH LOOP1: MOV A,R0 MOVX ＠DPTR，A INC R0 DJNZ R7,LOOPl MOV R0,#40H MOV R7,#10H LOOP2: MOV DPTR,#7FFFH LOOP3: MOVX A,@DPTR ANL A,#OFH JZ LOOP3 MOV A,#40H MOVX DPTR,A MOV DPTR,#7FFEH MOVX A,DPTR ANL A,#3FH MOV ＠R0,A INC R0 DJNZ R7,LOOP2 HERE: SJMP HERE RET