IC697MDL251
ENDPCTL（端點(diǎn)控制）模塊
設(shè)計(jì)中用到兩個(gè)端點(diǎn)，端點(diǎn)0和端點(diǎn)1。端點(diǎn)0是半雙工傳輸，主要是在設(shè)備的枚舉過程中用于控制傳輸， 端點(diǎn)1是在枚舉完成后的中斷傳輸中用設(shè)備和主機(jī)之間的數(shù)據(jù)傳輸。由于中斷傳輸主要是通過端點(diǎn)1輸入， 但也有少許輸出（如鍵盤的LED燈輸出），我們?yōu)榱斯?jié)省資源，所以由端點(diǎn)0完成少許的輸出。
2.3.5 BUFCTL（緩沖器控制）模塊
緩沖器控制模塊是USB和SRAM及ROM的連接橋梁，在主機(jī)要求輸入數(shù)據(jù)的IN token狀態(tài)時(shí)，控制器 從SRAM或ROM中取出數(shù)據(jù)送給主機(jī)或主機(jī)輸出數(shù)據(jù)的OUT token狀態(tài)時(shí)，控制器把接收到的數(shù)據(jù)存放在 SRAM中，它主要根據(jù)串行接口引擎SIE的接收或發(fā)送準(zhǔn)備信號來控制讀寫信號，保證數(shù)據(jù)能正確傳輸。 USB與MCU共享通用寄存器區(qū)，usbREQUST為來自USB的請求訪問存儲(chǔ)器信號，usbADDR為USB訪問存 儲(chǔ)器的地址信號，usbADDR［11:8］不等于零時(shí)屬于USB訪問程序存儲(chǔ)器的地址空間。當(dāng)USB與MCU同時(shí)訪 問數(shù)據(jù)存儲(chǔ)器（SRAM）時(shí)，MCU具有優(yōu)先權(quán)。
IC697MDL251
IC697MDL251聯(lián)系人：李先生
手機(jī)：18030229050
電話：0592-5709821
傳真：0592-5709828
QQ 1878187406
郵箱 1878187406@qq.com
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