微機原理上機實驗報告實驗一基本輸入/輸出實驗：本實驗使8255端口A工作在方式0并作為輸入口，端口B工作在方式0并作為輸出口。用一組開關(guān)信號接入端口A，端口B輸出線接至一組數(shù)據(jù)燈上，然后通過對8255芯片編程來實現(xiàn)輸入/輸出功能。8255基本輸入/輸出實驗參考接線圖如圖所示。流程圖：8255B8255B口方式0輸出，A口方式0輸入AL←8255A口8255B口←AL有按鍵？結(jié)束YN操作步驟：按圖示連好線路，在TDPIT中輸入如下程序，編譯、連接、運行。DATASEGMENTCS0EQU300OHMY8255_AEQUCS0+00HMY8255_BEQUCS0+01HMY8255_CEQUCS0+02HMY8255_MODEEQUCS0+03HDATAENDSCODESEGMENTASSUMECS:CODE,DS:DATASTART:MOVDX,3003HMOVAL,10000010BOUTDX,ALTEST_IT:MOVDX,3001H INAL,DX MOVDX,3000H OUTDX,AL JMPTEST_ITCODEENDSENDSTART實驗現(xiàn)象：閉合開關(guān)，對應(yīng)控制燈泡發(fā)光。實驗二流水線指示燈顯示實驗：首先分別將A口和B口寫入7FH和FEH，然后分別將該數(shù)右移和左移一位，在送到端口上，這樣循環(huán)下去，從而實現(xiàn)流水燈的顯示。8255流水燈顯示實驗參考接線圖如圖所示。流程圖：8255B8255B口方式0輸出AL←7FH循環(huán)左移AL8255B口←AL延時有按鍵？結(jié)束YN操作步驟：按圖示連好線路，在TDPIT中輸入如下程序，編譯、連接、運行。DATASEGMENT CSOEQU3000H AEQUCSO+0000H BEQUCSO+0001H CEQUCSO+0002H MEQUCSO+0003HDATAENDSCODESEGMENT ASSUMECS:CODE,DS:DATASTART: MOVAX,DATA MOVDS,AX XORAX,AX MOVAL,10000000B MOVDX,M OUTDX,AL ;MOVDX,B ;INAL,DXL1: MOVAL,00001000B MOVDX,A OUTDX,AL MOVAL,00000001B MOVDX,B OUTDX,AL MOVCX,00FFHC1: MOVBX,CX MOVCX,0FFFFHD1: LOOPD1 MOVCX,BX LOOPC1 MOVAL,00000100B MOVDX,A OUTDX,AL MOVAL,00000010B MOVDX,B OUTDX,AL MOVCX,00FFHC2: MOVBX,CX MOVCX,0FFFFHD2: LOOPD2 MOVCX,BX LOOPC2 MOVAL,00000010B MOVDX,A OUTDX,AL MOVAL,00000100B MOVDX,B OUTDX,AL MOVCX,00FFHC3: MOVBX,CX MOVCX,0FFFFHD3: LOOPD3 MOVCX,BX LOOPC3 MOVAL,00000001B MOVDX,A OUTDX,AL MOVAL,00001000B MOVDX,B OUTDX,AL MOVCX,00FFHC4: MOVBX,CX MOVCX,0FFFFHD4: LOOPD4 MOVCX,BX LOOPC4 JMPL1