io_8255.sdi

来自「lcd1602+lcd12864+led+key 扩展」· SDI 代码 · 共 17 行

,,,ORG 0100H
0100,74 80,,MOV A,#80H
0102,90 7F FF,,MOV DPTR,#7FFFH
0105,F0,,MOVX @DPTR,A
0106,74 7F,,MOV A,#07FH
0108,90 7C FF,,MOV DPTR,#7CFFH
010B,F0,LOOP,LOOP:MOVX @DPTR,A
010C,23,,     RL A
010D,31 11,,ACALL DELAY
010F,21 0B,,AJMP LOOP
0111,79 FF,DELAY,DELAY:MOV R1,#0FFH
0113,7A FF,L1,   L1:MOV R2,#0FFH
0115,DA FE,L2,   L2:DJNZ R2,L2
0117,D9 FA,,      DJNZ R1,L1
0119,22,,RET
000E,,,END