已知8255的端口地址为7FF0H--7FF3H,编写程序段从A口读入数据,从B口输 ...答:初始化程序为:MOVA,#0B8H MOV DPTR, #7FF3H MOVX @DPTR, A 程序清单:MOV A, #82H MOV DPTR, #7FF3H MOVX @DPTR, A BEGIN:MOV A, #00H MOV DPTR, #7FF0H MOVX @DPTR, A MOV DPTR, #7FF1H WAIT: MOVX A, @DPTR ANL A, #0FH CJNE A, #0FH, SM SJMP WAIT SM: ...