【正文】 375 工作于 串口方式。 比較這兩種我們選用 STC12C5A60AD CH375工作方式方案選擇 USB 總線的通用接口芯片 CH375 具有 8 位數(shù)據(jù) 總線和讀、寫、片選控制線以及中斷輸出，可以方便地掛接到單片機(jī) /DSP/MCU/MPU 等控制器的系統(tǒng)總線上。 如今， USB 技術(shù)已經(jīng)越來(lái)越普及和成熟，低成本、高穩(wěn)定性、較高的數(shù)據(jù)傳輸速率和即插即用的方便性，使其備受硬件廠商的青睞。 USB 模塊 ...................................................................................................................................................... 7 USB 協(xié)議 .............................................................................................................................................. 7 BULK 模塊 .................................................................................................................................................. 8 BULK_ONLY 和 UFI 協(xié)議 .................................................................................................................. 8 FAT模塊 ..................................................................................................................................................... 11 FAT32....................................................................................................................................................... 11 中斷處理模塊 ........................................................................................................................................... 11 五、方案的測(cè)試與分析 ...................................................................................................................................... 12 六、 總 結(jié) ........................................................................................................................................................... 12 參考文獻(xiàn) ............................................................................................................................................................... 13 致謝 ....................................................................................................................................................................... 14 附錄 ....................................................................................................................................................................... 14 總原理圖 .......................................................................................................................................................... 15 電路 PCB 圖 ..................................................................................................................................................... 15 元器件清單 ...................................................................................................................................................... 15 程序 ................................................................................................................................................................... 15 一 、 緒 論 隨著計(jì)算機(jī)技術(shù)的快速發(fā)展， USB（ Universal Serial Bus） 存儲(chǔ)設(shè)備的使用已經(jīng)非常普遍， USB 用于將適用 USB 的外圍設(shè)備 (device)連接到主機(jī) (host)，實(shí)現(xiàn)二者之間數(shù)據(jù)傳輸?shù)耐獠靠偩€結(jié)構(gòu)；是一種快速、靈活的總線接口 [5]。尤其在一些需要轉(zhuǎn)存數(shù)據(jù)的設(shè)備、儀器上提供能夠使用 USB 移動(dòng)儲(chǔ)存設(shè)備的 接口已經(jīng)變得非常有必要。但是隨著單片機(jī)技術(shù)的發(fā)展，以及單片機(jī)應(yīng)用領(lǐng)域的日益增長(zhǎng)， USB 外設(shè)的應(yīng)用也隨之?dāng)U大，為此在單片機(jī)系統(tǒng)中實(shí)現(xiàn)對(duì) USB 外設(shè)控制也變得日益迫切。 關(guān)鍵詞 ： U盤； CH375；接口芯片；單片機(jī) Abstract A general purpose interface chip CH37 5 for USB is introduced in this paper． Based On which a new method of Using external single chip microputer to connect with the flash disk is given． Only add one CH375 chip to the single chip microputer s hardware system， the operator can use the program given by the CH375 to read the data from the flash disk and realize the munication between the single chip microputer and the flash disk． This method is very simple and can be operated easily． Keywords： USB； CH375； interface chip； single chip microputer 目 錄 摘 要 ............................................................................................................................................................................ I ABSTRACT ............................................................................................................................................................... II 目 錄 ............................................................................................................................................................................ I 一、緒 論 ....................................................................................................................................................................3 二、 總體方案設(shè)計(jì)與選擇論證 ..............................................................................................................................4 總體設(shè)計(jì)分析 ...................................................................................................................................................4 功能模塊方案設(shè)計(jì)選擇 ..........................................................