51單片機(jī)實(shí)驗(yàn)及代碼

1、單片機(jī)實(shí)驗(yàn)實(shí)驗(yàn)一：開發(fā)環(huán)境的應(yīng)用（ 1）將數(shù)據(jù)存儲(chǔ)器的 40H-4FH的內(nèi)容復(fù)制成 00H-0FH，并將 40H-4FH的內(nèi)容整體復(fù)制到外部數(shù)據(jù)存儲(chǔ)器的1050H-105FH.（2）P1 口接八只二極管，使二極管逐個(gè)循環(huán)點(diǎn)亮ORG 0000HAJMP STARTORG 0100HSTART:MOV A,#00HMOV R0,#40HLOOP:MOV R0,AINC AINC R0CJNE A,#10H,LOOPSECOND:MOV DPTR,#1050HMOV R1,#40HCOPY:MOV A,R1MOVX DPTR,AINC DPTRINC R1CJNE R1,#50H,COPYSJMP

2、$END實(shí)驗(yàn)二：外部中斷（ 1）用單脈沖信號(hào)申請(qǐng)中斷，在中斷服務(wù)程序中對(duì)輸出信號(hào)進(jìn)行翻轉(zhuǎn)（可通過 P1.0 接一二極管觀察）ORG 0000HLJMP STARTORG 0003HLJMP INTORG 0100HSTART:SETB EX0SETB PX0SETB IT0SETB EASJMP $INT:CPL P1.0RETIEND（ 2）用單脈沖信號(hào)申請(qǐng)中斷，要求對(duì)中斷進(jìn)行累加計(jì)數(shù)，并將計(jì)數(shù)結(jié)果顯示在二極管上ORG 0000HLJMP STARTORG 0003HLJMP INTORG 0100HSTART:MOV A,#00HMOV P1,ASETB EX0SETB PX0SETB I

3、T0SETB EASJMP $INT:MOV P1,AINC ARETIEND實(shí)驗(yàn)三：定時(shí)器實(shí)驗(yàn)（ 1）用定時(shí)器 1 的方式 1 定時(shí)，P1.0 節(jié)發(fā)光二極管，使二極管每秒閃爍五次ORG 0000HLJMP MAINORG 001BHLJMP INTORG 0100HMAIN:MOV TMOD,#10HMOV TH1,#3CHMOV TL1,#0B0H； 50ms×2 = 100msMOV R2,#2SETB EASETB ET1SETB TR1SJMP $INT:DJNZ R2,NEXTCPL P1.0MOV R2,#2NEXT:MOV TH1,#3CHMOV TL1,#0B0HS

4、ETB TR1RETIEND（ 2）用定時(shí)器 1 的方式 2 計(jì)數(shù)， T1 引腳接單脈沖，用 P1 口接二極管顯示計(jì)數(shù)。ORG 0000HLJMP MAINORG 001BHLJMP LOOPORG 0100HMAIN:MOV TMOD,#60HMOV TH1,#00HMOV TL1,#00HSETB EASETB ET1SETB TF1SETB TR1SJMP $LOOP:MOV P1,TL1LJMP LOOPRETIEND實(shí)驗(yàn)四：串行通信波特率 2400 bit/s。PC發(fā)送 8 個(gè)字節(jié)的數(shù)據(jù)給單片機(jī)，單片機(jī)接受完數(shù)據(jù)后發(fā)送兩個(gè)字節(jié)55H和 AAH給 PC 機(jī)（使用查詢方式） 。ORG 0

5、000HAJMP MAINORG 0030HMAIN:MOV SCON,#50HMOV PCON,#00HMOV TMOD,#20HSETB TR1MOVTL1,#0F3HMOV TH1,#0F3HLOOP:MOV R0,#30HMOV R1,#08HWAIT1:JBC RI,RECEIVESJMP W AIT1RECEIVE:MOV A,SBUFMOV R0,AINC R0DJNZ R1,W AIT1MOV A,#55HMOV SBUF,AWAIT21:JBC TI,SENDSJMP W AIT21SEND:MOV A,#0AAHMOV SBUF,AWAIT22:JNB TI,WAIT22C

6、LR TISJMP LOOPEND實(shí)驗(yàn)五：數(shù)碼管顯示及鍵盤掃描（ 1）將 30H-32H中存儲(chǔ)的 6 位十進(jìn)制數(shù)在 6 個(gè)數(shù)碼管上顯示出來（要求編寫一個(gè)將內(nèi)存單元中的壓縮 BCD碼轉(zhuǎn)換為兩個(gè)七段顯示碼的子程序和延時(shí)子程序）ORG 0000HLJMP MAINORG 0030HMAIN:MOV 30H,#12HMOV 31H,#34HMOV 32H,#56HMOV R0,#30HMOV R1,#20HBCD:MOV A,R0SWAP AANL A,#0FHACALL CTABMOV R2,AMOV A,R0ANL A,#0FHACALL CTABMOV R3,AMOV DPTR,#8002HMO

7、V A,R1MOVX DPTR,AMOV DPTR,#8004HMOV A,R2MOVX DPTR,AMOV A,R1RR A MOV R1,ALCALL DLEYMOV DPTR,#8002HMOV A,R1MOVX DPTR,AMOV DPTR,#8004HMOV A,R3MOVX DPTR,AMOV A,R1RR AMOV R1,ALCALL DLEYINC R0CJNE R0,#33H,BCDLJMP MAINCTAB:PUSH DPHPUSH DPLMOV DPTR,#TABMOVC A,A+DPTRPOP DPLPOP DPHRETTAB:DB3FH,06H,5BH,4FH,66H

8、,6DH,7DH,07H,7FH,6FH,77H,7CH,39H,5EH,79H,71HDLEY:MOV R7,#02HDL:MOV R6,#0FFHDL1:DJNZ R6,DL1DJNZ R7,DLRETEND（2）掃描矩陣鍵盤，將對(duì)應(yīng)鍵盤值送LED顯示ORG 0000HLJMP STARTORG 1000HSTART:ACALLKEY1AJMPSTARTKEY1:ACALLKEY14JNZKEY3KEY2:ACALLKEY16AJMPKEY1KEY3:ACALLKEY16ACALLDELAYACALLKEY14JNZKEY4ACALLKEY16AJMPKEY1KEY4:MOVMOVR2,

9、#0FEHR4, #00HKEY5:MOVMOVMOVXMOVMOVXJBMOVAJMPDPTR,#8002HA, R2DPTR, ADPTR,#8001HA,DPTRACC.0,KEY6A, #00HKEY9KEY6:JBMOVAJMPACC.1,KEY7A, #06HKEY9KEY7:JBMOVAJMPACC.2,KEY8A, #0CHKEY9KEY8:JBMOVKEY9:ADDKEY10: MOVKEY11: ACALLJNZMOVACALLRETACC.3, KEY12A, #12HA, R4R5,AKEY14KEY11A,R5KEY15KEY12: INCR4MOVA, R2JNBA

10、CC.5,KEY13RLAMOVR2, AAJMPKEY5KEY13: AJMPKEY1KEY14: MOVDPTR,#8002HMOVA,#00HMOVXDPTR,AMOVDPTR,#8001HMOVXA,DPTRCPLAANLA, #0FHRETKEY15: MOVMOVCMOVDPTR,#TABLEA,A+DPTRR3,AKEY16: MOVMOVMOVXMOVMOVDPTR,#8002HA,#01HDPTR,ADPTR,#8004HA,R3MOVXDPTR,AACALLDELAYRETDELAY: MOVR7,#12LOOP:MOVR6,#250DJNZR6,$DJNZR7,LOOPR

11、ETTABLE:DB7EH,7EH,5EH,79H,71H,3FH,7EH,7EH,39H,4FH,5BH,06H,7EH,7EH,7CH,7DH,6DH,66H,7EH,7EH,77H,6FH,7FH,07HEND實(shí)驗(yàn)六： D/A 和 A/D（ 1）利用實(shí)驗(yàn)箱上的電位器提供模擬量輸入，將模擬量轉(zhuǎn)換成二進(jìn)制數(shù)字量，將轉(zhuǎn)換的結(jié)果用 P1 口輸出到二極管顯示；ORG 0000HLJMP MAINORG 0100HMAIN:MOV DPTR,#8000HMOV A,#00HMOVX DPTR,AMOV R2,#100DJNZ R2,$MOVX A,DPTRMOV P1,ALJMP MAINEND（2

12、）用 DAC0832將一個(gè)數(shù)值轉(zhuǎn)換為模擬電壓， 該模擬電壓接 ADC0809的一個(gè)模擬輸入進(jìn)行模/ 數(shù)轉(zhuǎn)換，轉(zhuǎn)換結(jié)果通過 P1 口送到二極管顯示。ORG 0000HLJMP MAINORG 0100HMAIN:MOV A,#90HMOV DPTR,#9000HMOVX DPTR,AMOV DPTR,#8000HMOVX DPTR,AMOV R2,#64HDJNZ R2,$MOVX A,DPTRMOV P1,ASJMP $END實(shí)驗(yàn)七：電子鐘實(shí)現(xiàn)一個(gè) 24 小時(shí)制的電子鐘程序，在 6 個(gè)數(shù)碼管上顯示時(shí)分秒（用定時(shí)器 0 中斷更新計(jì)時(shí)，以壓縮 BCD碼形式保存在內(nèi)部 RAM的 30H、31H和 3

13、2H單元）；可以通過串行口調(diào)時(shí)！ORG0000HAJMP MAINORG000BHLJMP CLOCKORG0023HLJMP INPUTORG0100HMAIN:MOVTMOD,#21HCLRAMOV30H,AMOV31H,AMOV32H,AMOVTH0,#3CHMOVTL0,#0B0HMOV50H,#14H;50 * 20MOVTH1,#0F3HMOVTL1,#0F3H; 波特率MOVSCON,#50HSETB PSMOVIE,#92HSETB TR1SETB TR0SLED:MOVR0,#30HMOVR1,#20HLJMP LEDCLOCK:MOVTH0,#3CHMOVTL0,#0B0H

14、DJNZ 50H,RETURNMOV50H,#14HMOVA,#01HADDA,32HDAAMOV32H,ACJNE A,#60H,RETURNMOV32H,#00HMOVA,#01HADDA,31HDAAMOV31H,ACJNE A,#60H,RETURNMOV31H,#00HMOVA,#01HADDA,30HDAAMOV30H,ACJNE A,#24H,RETURNMOV30H,#00HRETURN:RETILED:MOVA,R0SWAP AANLA,#0FHACALL CTABMOVR2,AMOVA,R0ANLA,#0FHLCALL CTABMOVR3,AMOVDPTR,#8002HMOVA,R1MOVX DPTR,AMOVDPTR,#8004HMOVA,R2MOVX DPTR,AMOVA,R1RR AMOV R1,ALCALL DLYMOVDPTR,#8002HMOVA,R1MOVX DPTR,AMOVDPTR,#8004HMOVA,R3MOVX DPTR,AMOVA,R1RR AMOV R1,ALCALL DLYINCR0CJNE R0,#33H,LEDLJMP SLEDCTAB:PUSH DPHPUSH