單 片 機 原 理 及 應 用 技 術 蘇 家 建課后習題參考答案

第三章MCS-51指令系統3-1MCS-51指令系統有哪幾種尋址方式？按功能分類有哪幾種指令？3-2設A=0FH,R0=30H,片內RAM的（30H）=0AH,（31H）=0BH,（32H）=0CH,下列程序段運行后的結果？MOVA,@R0;A=0AHMOV@R0,32H;(30H)=0CHMOV32H,A;(32H)=0AHMOVR0,#31H;R0=31HMOVA,@R0;A=(31H)=0BH3-3（1）R0的內容傳送到R1MOVA,R0MOVR1,ARAM20HAMOVA,20HRAM30HMOVR1,#30HMOVXA,@R1MOVR0,ARAM30HRAM20H單元MOVR1,#30HMOVXA,@R1MOV20H,ARAM1000HRAM20H單元MOVDPTR,#1000HMOVXA,@DPTRMOV20H,AROM2000HR1MOVDPTR,#2000HCLRAMOVCA,@A+DPTRMOVR1,ARAM2000HRAM20H單元MOVDPTR,#2000HMOVXA,@DPTRMOV20H,ARAM2000HRAM30H單元MOVDPTR,#2000HMOVXA,@DPTRMOVR0,#30HMOVX@R0,ARAM2000HRAM1000H單元MOVDPTR,#2000HMOVXA,@DPTRMOVDPTR,#1000HMOVX@DPTR,ARAM30H=5AH,5AH=40H,40H=00H,P1=7FH,下面程序執行后的結果如何？MOVR0,#30H;R0=30HMOVA,@R0;A=(30H)=5AHMOVR1,A;R1=5AHMOV@R1,P1;(5AH)=7FHMOVA,P1;A=7FHMOV40H,#20H;(40H)=20HMOV30H,40H;(30H)=00HRAM20H-2FH16個連續單元清零ORG0100HMOVR0,#20HMOVR2,#16LOOP:MOV@R0,#00HINCR0DJNZR2,LOOPENDRAM20H單元中的數據含“121H單元中。ORG0100HMOV21H,#0MOVR2,#8MOVA,20HCLRCLOOP:RLCAJCCOUNTDJNZR2,LOOPSJMPSTOPCOUNT:INC21HDJNZR2,LOOPSTOP:SJMP$ENDRAM30H-50HFFH51H單元中。ORG0100HMOV51H,#0MOVR0,#30HMOVR2,#20HLOOP:MOVA,@R0CJNEA,#0FFH,AGAININC51HAGAIN:INCR0DJNZR2,LOOPSJMP$END編程，計算i0i30H單元10ORG0100HMOV30H,#0MOV31H,#0;i的初值MOVR0,#30HMOVR2,#11MOVA,31HLOOP:INC31HADDA,@R0MOV@R0,AMOVA,31HRLADJNZR2,LOOPSJMP$END3-9已知片內RAM(30H)=38H,(38H)=40H,(40H)=48H,(48H)=90H.說明下列指令源操作數的尋址方式，及指令執行的結果MOVA,40H;A=48H直接尋址MOVR0,A；R0=48H寄存器尋址MOVP1,#0F0H;P1=0F0H直接尋址MOV@R0,30H;(48H)=38H寄存器間接尋址MOVDPTR,#3848H;DPTR=3848H直接尋址MOV40H,38H;(40H)=(38H)=40H直接尋址MOVR0,30H;R0=(30H)=38H寄存器尋址MOVP0,R0;P0=38H直接尋址MOV18H,#30H;(18H)=30H直接尋址MOVA,@R0;A=(38H)=40H直接尋址MOVP2,P1;P2=0F0H直接尋址3-10R0=32H,A=48H,RAM(32H)=80H,(40H)=08H.MOVA,@R0;A=(32H)=80HMOV@R0,40H;(32H)=（40H）=08HMOV40H,A;(40H)=80HMOVR0,#35H;R0=35HA=83H,R0=17H,RAM(17H)=34H,ANLA,#17H;A=03HORLA,17H;(17H)=（37HXRLA,@R0;A=37HCPLA;A=C8HRAM20H-2FH30H-3FH中數據的對換ORG0100HMOVR0,#20HMOVR1,#40HMOVR2,#0FHLOOP:MOVA,@R0MOV@R1,AINCR0INCR1DJNZR2,LOOPMOVR0,#30HMOVR1,#20HMOVR2,#0FHLOOP1:MOVA,@R0MOV@R1,AINCR0INCR1DJNZR2,LOOP1MOVR0,#30HMOVR1,#40HMOVR2,#0FHLOOP1:MOV@R0,AINCR0INCR1DJNZR2,LOOP1SJMP$ENDA=34H,(30H)=4FH,ADDA,30HA=83H,PSW=41H3-14SP=25H,PC=2345H,(24H)=12H,(25H)=34H,(26)=56H,RETSP=23H,PC=3412H3-15SP=25H,PC=2345H,標號LABEL所在的地址3456H，執行LCALLLABEL后SP=PC=,堆棧中的數據有何變化？SP=27H(26H)=48H(27H)=23HPC=3456H第四章程序設計基礎RAM30H20H編程統計出正數，021H,22H,23H單元。ORG0100HMOV21H,#0MOV22H,#0MOV23H,#0MOVR0,#30HLOOP:CJNEA,#0,PDINC22HSJMPDONEPD:JBACC.7,FUINC21HSJMPDONEFU:INC23HDONE:DJNZ20H,LOOPSJMP$ENDRAM20H-2FH.凡是滿足奇偶校驗的數據（1的個數為偶數）的數轉存到片外8000H開始的數據區ORG0100HMOVR0,#20HMOVDPTR,#8000HMOVR2,#0FHLOOP:MOVA,@R0JBPSW.0,DONEMOVX@DPTR,AINCDPTRDONE:INCR0DJNZR2,LOOPSJMP$ENDRAM1000H-10FFH2000HORG0100HMOVR3,#10HMOVR4,#20HMOVDPL,#00HMOVR2,#0LOOP:MOVDPH,R3MOVXA,@DPTRMOVDPH,R4MOVX@DPTR,AINCDPLDJNZR2,LOOPSJMP$ENDRAM30H21H21HORG0100HMOVR0,#30HMOVR2,21HMOVA,30HLOOP:CJNEA,@R0,PDSJMPDONEPD:JNCDONEMOV22H,@R0XCHA,22HDONE:INCR0DJNZR2,LOOPMOV21H,ASJMP$ENDRAM30H16ORG0100HMOVR0,#30HMOVR1,#40HMOVR2,#0FHLOOP:MOVA,@R0MOV@R1,AINCR0INCR1DJNZR2,LOOPMOVR2,#0FHMOVR0,#40HMOVR1,#3FHLOOP1:MOV@R1,AINCR0DECR1DJNZR2,LOOP1SJMP$END編程實現片內RAM30H16個數，存有最小數值的所在單元的內容改為0FFHORG0100HMOVR0,#30HMOVR2,#16MOVA,30HMOV22H,#0;22H存放找到的16個數中的最小值MOV23H,#0;LOOP:CJNEA,@R0,PDSJMPDONEPD:JNCDONEMOV22H,@R0MOV23H,R0XCHA,22HDONE:INCR0DJNZR2,LOOPMOVR0,23HMOV@R0,#0FFHSJMP$END4-7編程實現P1.7=P1.6(P1.5 ORG0100HMOVC,P1.5ANLC,/P1.4MOV20H,CMOVC,P1.4ANLC,/P1.5ORLC,20HANLC,P1.6MOVP1.7,CEND4-8RAM30H164080，將結果存入40H單元中ORG0100HMOVR0,#30HMOVR2,#16MOV40H,#0LOOP:MOVA,@R0CJNEA,#40,PDSJMPDONEPD:JNCPD2SJMPDONEPD2:CJNEA,#80,PD3SJMPDONEPD3:JCCOUNTSJMPDONECOUNT:INC40HDONE:INCR0DJNZR2,LOOPSJMP$END第六章中斷系統工作方式T0T12用于串口通信器）2工作方式T0T12用于串口通信器）28TH0、TL0被8位計數，無最大計數模值初值加載方式最大計數模值初值加載方式方式0213人工加載213人工加載方式1216人工加載216人工加載28自動加載28自動加載（常方式3分成兩個相互8數器；TL0可做定時器也中斷產生，自動加載初值，用于不需要中斷的場合可做計數器；TH0可做內部定時器。人工加載初值已知單片機系統時鐘頻率fosc=12MHz，若要求定時值分別為0.1ms、1ms、T0013時，定時器對應的初值各為多少？定時時間工作方式值0初工作方式1值初工作方式2值初工作方式3初值0.1msFC1CHFF9CH9CH9CH1msE018HFC18H10msD8F0H定時器/計數器T01562計數，現T01ms的脈沖，問：T0的實際用途是？在什么情況下，T0答：（1）計數器（2）T0可記錄100個外部脈沖，即從開始啟動工作，經過100ms 開始溢出。6MHz，利用T0和P1.050us300us。6MHz2us,若T01，則P1.0T025216-25=FFE7HP1.0T0需150216-150=FF6AH，編程如下ORG0000HLJMPMAINORG000BHLJMPT00ORG0100HMAIN:MOVSP,#60HMOVTMOD,#01HMOVTH0,#0FFHMOVTL0,#0E7HSETBEASETBET0SETBP1.0SETBTR0SJMP$T00:JNBP1.0,QFMOVTH0,#FFHMOVTL0,#0E7HSJMPDONEQF:MOVTH0,#0FFHMOVTL0,#6AHDONE:CPLP1.0RETIENDf0sc=6MHz，求允許測量的最大脈沖寬度是多少？答：定時器方式1，最大脈沖寬度為2us*216=131.072msP1.2P1.1P1.2R6R7。解：P1.1P3.4引腳，利用T010（T0斷方式）ORG0000HLJMPMAIN;ORG000BHORG0100HMAIN:MOVSP,#60HMOVR6,#0MOVR7,#0MOVTMOD,#05HMOVTH0,#0MOVTL0,#0LOOP:JNBP1.2,LOOPSETBTR0LOOP1:JBP1.2,LOOP1CLRTR0MOVR6,TH0MOVR7,TL0SJMP$ENDLED2s1s,1s。解：設P1.01發光二極管，低電平點亮；利用定時器T02fosc=12MHz,1us,250us,4000個中1s的定時R6,R740，100ORG0000HLJMPMAINORG000BHLJMPT00ORG0100HMAIN:MOVSP,#60HMOVTMOD,#02HMOVTH0,#06HMOVTL0,#06HMOVR6,#40MOVR7,#100CLRP1.0SETBEASETBET0SETBTR0SJMP$T00:DJNZR6,DONEMOVR6,#40DJNZR7,DONEMOVR7,#100DONE:CPLP1.0RETIEND8031P1.0P1.1每分鐘產生一個機器周期的正脈沖。12MHz1usT0做定時器記錄50ms,216-50000=3CB0HR6,R720，601s1分鐘的定時ORG0000HLJMPMAINORG000BHLJMPT00ORG0100HMAIN:MOVSP,#60HMOVTMOD,#01H；T0定時器，工作方式1MOVTH0,#3CHMOVTL0,#0B0H；裝入50ms的初始值MOVR6,#20MOVR7,#60CLRP1.0；P1.0,P1.1均輸出低電平CLRP1.1SETBEASETBET0SETBTR0；中斷允許，開始定時SJMP$T00:DJNZR6,DONE；R6-1=0,定時1秒時間到SETBP1.0；P1.01usCLRP1.0；P1.0繼續輸出低電平MOVR6,#20DJNZR7,DONE；R7-1=0,定時1分鐘時間到SETBP1.1；P1.11usCLRP1.1；P1.1繼續輸出低電平MOVR7,#60DONE:MOVTH0,#3CHMOVTL0,#0B0HRETIEND第七章串口工作方式0——關于I0接口的擴展7-174LS16481S右，并循環往復，畫出電路原理圖，編程實現。(P109)ORG0100HMOVSCON,#00HMOVA,#80HLOOP:MOVSBUF,AACALLDEL1SRRASJMPLOOP7-4利用MCS-51系列單片機的串行接口設計鍵盤輸入電路(P111)第九章模擬量輸入輸出接口技術fosc12MHz8031DAC0832，它的地址為7FFFH0-5V上顯示鋸齒波（X50us/格，Y1V/格）。答：ORG0000HLJMPMAINORG0100HMAIN:MOVSP,#60HMOVDPTR,#7FFFHLOOP:MOVA,#00HLOOP1:MOVX@DPTR,A;2INCA;1CJNEA,#0,LOOP1;2SJMPLOOPEND輸出波形為周期是255us,幅值為5V的鋸齒波.fosc=12MHzADC08097FF8H-7FFFHADC08092的程序（1ms一48031RAM70h-73h中）。答：P1.0連接0809的START端ORG0000HLJMPMAINORG0100HMAIN:MOVSP,#60HMOVDPTR,#7FFAHMOV70H,#0MOV71H,#0MOV72H,#0MOV73H,#0MOVR2,#4MOVR0,#70HLOOP:ACALLDEL_1msLOOP1:SETBP1.0NOPNOPNOPCLRP1.0MOVXA,@DPTRMOV@R0,AACALLDEL_100usINCR0DJNZR2,LOOP1MOVR0,#70HMOVR2,#4SJMPLOOPDEL_1ms:MOVR7,#5;1DEL2:MOVR6,#100;1DEL1:DJNZR6,DEL1;2DJNZR7,DEL2;2RETDEL_100us:MOVR5,#5;1DEL21:MOVR4,#10;1DEL11:DJNZR4,DEL11;2DJNZR5,DEL21;2RETENDDAC08328031單片機連接時有哪些控制信號？其作用是什么？P201CS,WR1,WR2XFER。CS,WR1兩個引腳，使數據線上的數據送入輸入寄存器；CPU發出控制信號WR2XFERDACD/A轉換器進行轉換，變成模擬信號輸出。已知DAC08327FFFH0-5V1：42.5V1.25V。答：ORG0000HLJMPMAINORG0100HMAIN:MOVSP,#60HMOVDPTR,#7FFFHMOVR2,#3LOOP:MOVA,#7FHMOVX@DPTR,A;2ACALLDELMOVA,#40HMOVX@DPTR,ADELL:ACALLDELDJNZR2,DELLMOVR2,#3SJMPLOOPDEL:MOVR7,#10;若主頻為12MHz,則波形周期為400usDEL2:MOVR6,#20DEL1:DJNZR6,DEL1DJNZR7,DEL2RETEND已知ADC08097FF8H-7FFFH100ms810RAM3000H開始的存儲單元中（設fosc=6MHz）答：P1.00809START端ORG0000HLJMPMAINORG0003HLJMPZD0