可編程計(jì)數(shù)器定時(shí)器8254

《可編程計(jì)數(shù)器定時(shí)器8254》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在教育資源-天天文庫(kù)。

1、課程名稱匯編語(yǔ)言與微機(jī)原理實(shí)驗(yàn)名稱8254定時(shí)/計(jì)數(shù)器應(yīng)用實(shí)驗(yàn)實(shí)驗(yàn)?zāi)康?、要?.掌握8254的工作方式及應(yīng)用編程。2.掌握8254典型應(yīng)用電路的接法。實(shí)驗(yàn)原理編寫程序，將8254的計(jì)數(shù)器0設(shè)置為方式3，計(jì)數(shù)值為十進(jìn)制數(shù)4，用單次脈沖KK1＋作為CLK0時(shí)鐘，OUT0連接INTR，每當(dāng)KK1＋按動(dòng)5次后產(chǎn)生中斷請(qǐng)求，在屏幕上顯示字符"5"。主要設(shè)備、器材PC機(jī)一臺(tái)，TD-PIT實(shí)驗(yàn)裝置一套實(shí)驗(yàn)步驟及原始數(shù)據(jù)記錄（1）實(shí)驗(yàn)接線如圖4-6-3所示。（2）運(yùn)行Tdpit集成操作軟件，根據(jù)實(shí)驗(yàn)內(nèi)容，編寫實(shí)驗(yàn)程序，編譯、鏈接。（3）運(yùn)

2、行程序，按動(dòng)KK1＋產(chǎn)生單次脈沖，觀察實(shí)驗(yàn)現(xiàn)象。（4）改變計(jì)數(shù)值，驗(yàn)證8254的計(jì)數(shù)功能。89INTR_IVADDEQU01C8HINTR_OCW1EQU0A1HINTR_OCW2EQU0A0HINTR_IMEQU0FBHIOY0EQU3000HMY8254_COUNT0EQUIOY0+00H*4MY8254_COUNT1EQUIOY0+01H*4MY8254_COUNT2EQUIOY0+02H*4MY8254_MODEEQUIOY0+03H*4STACK1SEGMENTSTACKDW256DUP(?)STACK1ENDS

3、DATASEGMENTCS_BAKDW?IP_BAKDW?IM_BAKDB?STR1DB'COUNT:$'DATAENDSCODESEGMENTASSUMECS:CODE,DS:DATASTART:MOVAX,DATAMOVDS,AXCLIMOVAX,0000HMOVES,AXMOVDI,INTR_IVADDMOVAX,ES:[DI]MOVIP_BAK,AXMOVAX,OFFSETMYISRMOVES:[DI],AXADDDI,2MOVAX,ES:[DI]MOVCS_BAK,AXMOVAX,SEGMYISRMOVES:[D

4、I],AXMOVDX,INTR_OCW1INAL,DXMOVIM_BAK,ALANDAL,INTR_IMOUTDX,ALSTIMOVDX,OFFSETSTR1MOVAH,9INT21HMOVDX,MY8254_MODEMOVAL,10HOUTDX,ALMOVDX,MY8254_COUNT0MOVAL,4OUTDX,ALWAIT1:MOVAH,1INT16HJZWAIT1QUIT:CLIMOVAX,0000HMOVES,AXMOVDI,INTR_IVADDMOVAX,IP_BAKMOVES:[DI],AXADDDI,2MOV

5、AX,CS_BAKMOVES:[DI],AXMOVDX,INTR_OCW1MOVAL,IM_BAKOUTDX,ALSTIMOVAX,4C00HINT21HMYISRPROCNEARPUSHAXMOVAL,35HMOVAH,0EHINT10HMOVAL,20HINT10HMOVDX,MY8254_COUNT0MOVAL,4OUTDX,ALOVER:MOVDX,INTR_OCW2MOVAL,20HOUTDX,ALMOVAL,20HOUT20H,ALPOPAXIRETMYISRENDPCODEENDSENDSTART實(shí)驗(yàn)結(jié)果1．

6、程序運(yùn)行之后，KK1＋按動(dòng)5次后產(chǎn)生中斷請(qǐng)求，在屏幕上顯示字符"5"。