實(shí)驗(yàn)十五發(fā)光二極管陣列的單片機(jī)顯示控制實(shí)現(xiàn) (綜合實(shí)驗(yàn))

1、實(shí)驗(yàn)十五發(fā)光二極管陣列的單片機(jī)顯示控制實(shí)現(xiàn)(綜合實(shí)驗(yàn)一、實(shí)驗(yàn)?zāi)康?.了解點(diǎn)陣LED的顯示原理2.掌握PROTEUS ISIS軟件仿真單片機(jī)原理的方法3.設(shè)計(jì)整個(gè)單片機(jī)實(shí)驗(yàn)電路及軟件,實(shí)現(xiàn)發(fā)光二極管陣列的單片機(jī)顯示控制二、實(shí)驗(yàn)內(nèi)容利用8×8點(diǎn)陣LED循環(huán)顯示09的數(shù)字三、實(shí)驗(yàn)原理數(shù)字09點(diǎn)陣顯示代碼的形成,如圖15.1所示(假設(shè)顯示數(shù)字“0”1 2 3 4 5 6 7 8 00 3E 41 41 41 3E 00 00圖15.1數(shù)字“0”的段碼因此,形成的行代碼為00H,3EH,41H,41H,41H,3E,00H,00H;只要把這些代碼分別送到相應(yīng)的行線上面,即可實(shí)現(xiàn)“0”的數(shù)字顯示

2、。送顯示代碼過程如下:送第一行線代碼到P0端口,同時(shí)置第一列線為“1”,其他行線為“0”,延時(shí)約4ms;送第二列線代碼到P0端口,同時(shí)置第二行線為“1”,其他行線為“0”,延時(shí)約4ms;依次類推,直到送完最后一列代碼,又從頭開始送。四、實(shí)驗(yàn)步驟1.硬件設(shè)計(jì)打開Proteus ISIS編輯環(huán)境,按表15.1所列元件清單添加元件。表15.1元件清單元件清單所屬類所屬子類AT89C51 Microprocessor ICs 8051 FamilyCAP Capacitors GenericCAP.ELEC Capacitors GenericCRYSTAL Miscellaneous .RES Re

3、sistors Generic74LS245 TTL 74LS Series TransceiversMA TRIX.8×8 Optoelectronics Don Matrix Displays元件全部添加完后,在Proteus ISIS編輯環(huán)境中按圖15.2所示連接硬件原理圖。具體操作步驟見附錄A。 圖15.2 電路原理圖2.軟件設(shè)計(jì)程序流程: 源程序:TCOUNT EQU 30HR_CNT EQU 31HNUMB EQU 32HORG 00HLJMP STARTORG 0BHLJMP INT_T0START: MOV TCOUNT,#00HMOV R_CNT,#00HMOV N

4、UMB,#00HMOV TMOD,#01HMOV TH0,#(65536.4000/256 ;定時(shí)4msMOV TL0,#(65536.4000MOD 256SETB TR0MOV IE,#82HSJMP $INT_T0: MOV TH0,#(65536.4000/256MOV TL0,#(65536.4000MOD 256MOV DPTR,#TAB ;取列碼MOV A,R_CNTMOVC A,A+DPTRMOV P3,AMOV DPTR,#NUB ;取行碼MOV A,NUMBMOV B,#8MUL ABADD A,R_CNTMOVC A,A+DPTRCPL AMOV P0,A ;輸出行碼IN

5、C R_CNTMOV A,R_CNTCJNE A,#8,NEXTMOV R_CNT,#00HNEXT: INC TCOUNTMOV A,TCOUNTCJNE A,#250,NEX ;每個(gè)字顯示1sMOV TCOUNT,#00HINC NUMBMOV A,NUMBCJNE A,#10,NEX ;09循環(huán)顯示MOV NUMB,#00HNEX: RETITAB: DB 0FEH,0FDH,0FBH,0F7H,0EFH,0DFH,0BFH,07FHNUB: DB 00H,3EH,41H,41H,41H,3EH,00H,00HDB 00H,00H,00H,00H,21H,7FH,01H,00HDB 00

6、H,00H,27H,45H,45H,45H,39H,00HDB 00H,00H,22H,49H,49H,49H,36H,00HDB 00H,00H,0CH,14H,24H,7FH,04H,00HDB 00H,00H,72H,51H,51H,51H,4EH,00HDB 00H,00H,3EH,49H,49H,49H,26H,00HDB 00H,00H,40H,40H,40H,4FH,70H,00HDB 00H,00H,36H,49H,49H,49H,36H,00HDB 00H,00H,32H,49H,49H,49H,3EH,00HEND3.調(diào)試與仿真1. 打開Keil Vision,新建Keil項(xiàng)目,選擇A T89C51單片機(jī)作為CPU,新建匯編源文件,編寫程序,并將其導(dǎo)入到“Source Group 1”中,在“Options for Target”對(duì)話窗口中,選中“Output”選項(xiàng)卡中的“Create HEX File”選項(xiàng),。編譯匯編源程序,改正程序中的錯(cuò)誤。具體操作步驟見附錄B。2. 在Proteus ISIS中,選中A T89C51并單擊鼠標(biāo)左鍵,打開“Edit Component”對(duì)話窗口,設(shè)置單片機(jī)晶振頻率為12MHz,在此窗口中的“Program File”欄中,選擇