【正文】 個引腳被外部信號拉低時會輸出一個電流 I。 P3口： P3 口是一個帶內(nèi)部上拉電阻的 8 位雙向 I/O 口。 RST:復(fù)位輸入，當(dāng)震蕩器工作時， RST 引腳出現(xiàn)兩個機器周期以上高電平將使單片機復(fù)位。 LED 顯示驅(qū)動電路 LED 顯示驅(qū)動電路如圖 所示。如果你用啟動盤啟動系統(tǒng)后用 DIR 命令可能得到一串串莫名其妙的字符，但那確確實實是漢字，如果你啟動 UCDOS 或其他的漢字系統(tǒng)后，就會看到那是一個個熟悉的漢字。在通過硬件實現(xiàn)字模提取的技術(shù)中，有在單片機系統(tǒng)中增加硬漢字庫的方法，主控器發(fā)送的漢字是其機內(nèi)碼，用兩個字節(jié)來表示一個漢字。 軟件控制系統(tǒng)字模提取的分析與設(shè)計 而在 LED 顯示屏控制系統(tǒng)具體應(yīng)用的 Windows 操作系統(tǒng)下如何提取字模信息是設(shè)計的核心。通過這樣的設(shè)計，我們不僅可以把任何字型，任何大小的文 字保存下來，還可以顯示以 256 個像素點陣為單位的任何圖形。由于單色屏只有紅色和不顯色兩種，所以可以簡單賦值為除白色外其余點賦值為 1 CClientDC dc(this)。 COLORREF zimo_color。row192。 if (zimo color = =Oxffffff) {zimo [row] [col]=0。在條屏顯示的過程中按規(guī)定的方式取出 E2PROM 中的字模數(shù)據(jù)進行處理。因此這種方案，需要在單片機外部擴展大容量的 E2PROM，增加硬件成本。而本設(shè)計創(chuàng)新使用了專用的點陣字庫芯片，成本僅為 8 元，內(nèi)含各種點陣規(guī)格的 GB231 ASCII 等標(biāo)準(zhǔn)字庫。 用 AT89C5 74LS37 74LS13 74HC154 芯片和 4個 16 16LED 點陣顯示器構(gòu)成一個 完整的 16 位點陣 LED 顯示 系統(tǒng) 。設(shè)計時可采用如下方法：首先將 LED 顯示屏對應(yīng)的顯示緩沖區(qū)全部清零，即 LED 顯示空白，然后每間隔一個 “ 軟定時器 ” 設(shè)定的動態(tài)顯示時間，顯示緩沖區(qū)依次加入一個漢字點陣數(shù)據(jù)并進行掃描顯示，這樣就可達到 動態(tài) 顯示的效果。事實 上這個漢字屏不僅可以顯示漢字， 也可以顯示在 256 像素范圍內(nèi)的任何圖形。實現(xiàn)了漢字的左移滾動顯示，完整的顯示出了“陜西理工學(xué)院”浮動漢字 。 ，應(yīng)用廣泛。 致謝 在完成此設(shè)計過程中，我曾多次去找我的指導(dǎo)老師，李建忠老師，每次在遇到實驗中遇到困難或者程序看不懂的時候，我都去找李老師，不管上班下班時間，李老師每次都不厭其煩，不辭辛苦的給我細心講解指導(dǎo)，我才能在實驗室完成實驗，在寫論文過程中老師也給了我很大幫助，在此，我由衷的對李老師對我的指導(dǎo)和教育。單片機輸出 MOV A,R3 MOVC A,A+DPTR MOV P2,A INC R3 MOV A,R3 MOVC A,A+DPTR MOV P0,A INC R3 MOV P3,R4 LCALL DELAY1MS INC R2 CJNE R2,16,MAIN MOV R2,0 INC R4 CJNE R4,4,MAIN MOV R3,0 MOV R4,0 LJMP MAIN 。延時 DEL: MOV R6,250 DJNZ R6,$ DJNZ R7,DEL RET 。DB 07FH,0C0H,010H,0A0H,012H,090H,014H,088H,000H,08CH,000H,004H,000H,004H,000H,000H DB 00H,00H,7FH,0FFH,44H,20H,5AH,10H,61H,0E1H,10H,82H,14H,84H,12H,88H DB 10H,0B0H,0FFH,0C0H,10H,0B0H,12H,88H,34H,86H,11H,83H,00H,82H,00H,00H DB 000H,000H,003H,000H,002H,0F8H,022H,010H,022H,050H,03FH,090H,022H,010H,022H,010H DB 07FH,090H,044H,090H,044H,090H,004H,00CH,004H,030H,007H,0C0H,000H,000H,000H,000H DB 000H,010H,011H,010H,011H,020H,01FH,0E0H,022H,048H,000H,048H,038H,008H,027H,048H DB 025H,048H,03FH,0F0H,04AH,090H,042H,090H,07EH,010H,000H,010H,000H,000H,000H,000H DB 000H,000H,000H,010H,000H,010H,000H,010H,008H,010H,008H,010H,008H,010H,00FH,0E0H DB 010H,020H,010H,020H,010H,020H,000H,020H,000H,020H,000H,020H,000H,000H,000H,000H DB 000H,000H,003H,020H,00EH,020H,044H,020H,024H,020H,005H,020H,04AH,024H,02AH,0C2H DB 00BH,07CH,01AH,040H,0E8H,040H,008H,040H,00CH,040H,008H,000H,000H,000H,000H,000H DB 000H,000H,03FH,0FCH,022H,000H,02DH,004H,033H,008H,004H,010H,018H,0A0H,00AH,0C0H DB 052H,080H,035H,0F8H,015H,004H,011H,004H,018H,004H,000H,038H,000H,000H,000H,000H DB 02H,00H,02H,00H,42H,00H,33H,0FEH,00H,04H,02H,08H,02H,10H,02H,00H DB 02H,00H,0FFH,0FFH,02H,00H,02H,00H,02H,00H,06H,00H,02H,00H,00H,00H DB 10H,10H,20H,10H,0C0H,11H,5FH,0D2H,75H,7CH,55H,50H,55H,50H,35H,50H DB 0D5H,50H,55H,50H,75H,7FH,5FH,0D0H,40H,10H,40H,30H,00H,10H,00H,00H DB 08H,20H,08H,0C0H,0BH,00H,0FFH,0FFH,09H,01H,08H,82H,00H,04H,3FH,0F8H DB 20H,00H,20H,00H,20H,00H,7FH,0FCH,20H,02H,00H,02H,00H,0EH,00H,00H DB 24H,08H,24H,10H,24H,60H,25H,80H,7FH,0FFH,0C5H,00H,44H,80H,00H,40H DB 24H,40H,12H,40H,00H,40H,0FFH,0FFH,00H,80H,01H,80H,00H,80H,00H,00H DB 02H,20H,0CH,20H,88H,20H,69H,20H,09H,20H,09H,22H,89H,21H,69H,7EH DB 09H,60H,09H,0A0H,19H,20H,28H,20H,0C8H,20H,0AH,60H,0CH,20H,00H,00H DB 00H,10H,00H,10H,00H,10H,0FFH,10H,11H,10H,11H,10H,11H,10H,11H,10H DB 11H,10H,11H,32H,11H,11H,11H,02H,33H,0FCH,11H,00H,00H,00H,00H,00H DB 08H,20H,08H,22H,08H,41H,0FFH,0FEH,08H,80H,08H,01H,11H,81H,11H,62H DB 11H,14H,0FFH,08H,11H,14H,11H,64H,31H,82H,10H,03H,00H,02H,00H,00H DB 04H,08H,04H,08H,04H,10H,04H,20H,04H,40H,04H,80H,05H,00H,0FFH,0FFH DB 05H,00H,44H,80H,24H,40H,34H,20H,04H,10H,0CH,18H,04H,10H,00H,00H DB 49H,40H,4AH,51H,4CH,6AH,7FH,0C4H,4CH,4AH,8AH,71H,88H,42H,3FH,84H DB 64H,98H,0A5H,0E0H,3EH,0BEH,24H,81H,24H,89H,7FH,81H,20H,07H,00H,00H DB 01H,00H,02H,00H,04H,00H,1FH,0FFH,0E2H,02H,12H,22H,12H,22H,12H,22H DB 12H,22H,0FFH,0FEH,12H,22H,12H,22H,32H,62H,16H,26H,02H,02H,00H,00H DB 01H,40H,02H,40H,0EH,40H,0F3H,0FEH,12H,44H,12H,48H,09H,00H,11H,28H DB 0F2H,0A8H,2AH,0A8H,25H,0FFH,2AH,0A8H,32H,0A8H,23H,28H,02H,00H,00H,00H END