描述
3.2.2程序存儲(chǔ)器
C8051F020的程序存儲(chǔ)器包含64KB的FLASH,該存儲(chǔ)器以512B為1個(gè)扇區(qū),可以在系統(tǒng)編程,且無需在片外提供編程電壓,該程序存儲(chǔ)器未用到的扇區(qū)均可由用戶按扇區(qū)作為非易失性數(shù)據(jù)存儲(chǔ)器使用。
3.3I/O與數(shù)字交叉開關(guān)
C8051F020單片機(jī)除具有標(biāo)準(zhǔn)的8051機(jī)端口P0~P3外,還具有附加的4個(gè)8位I/O口。這樣,I/O口總數(shù)可達(dá)64個(gè),每個(gè)端口I/O引腳都可設(shè)置為推挽或開漏輸出。最為獨(dú)特的功能是引入了數(shù)字交叉開關(guān),它可將內(nèi)部數(shù)字系統(tǒng)資源分配給P0、P1、P2和P3端口的I/O引腳,并可將片內(nèi)計(jì)數(shù)器/定時(shí)器、串行總線、中斷源、A/D轉(zhuǎn)換輸入、比較器輸出以及微控制器的其它數(shù)字信號(hào)配置為在上述I/O引腳輸出,這就允許用戶根據(jù)自己的特定應(yīng)用選擇通用I/O和所需數(shù)字資源的組合。
3.4可編程計(jì)數(shù)陣列
除了內(nèi)部提供5個(gè)16位的通用定時(shí)/計(jì)數(shù)器外,C8051F020還提供1個(gè)片內(nèi)編程的計(jì)數(shù)器/定時(shí)器陣列(PCA),PCA包括1個(gè)專用的16位計(jì)數(shù)器/定時(shí)器,5個(gè)可編程的捕捉比較模塊,時(shí)間基準(zhǔn)可以是下面的6個(gè)時(shí)鐘源之一:系統(tǒng)時(shí)鐘/12;系統(tǒng)時(shí)鐘/4;定時(shí)器0溢出;外部時(shí)鐘輸入;系統(tǒng)時(shí)鐘和外部振蕩頻率/8。每個(gè)捕捉模塊都有6種工作方式:邊沿觸發(fā)捕捉、軟件定時(shí)器、高速輸出、8位脈沖寬度調(diào)制器,頻率輸出、16位脈沖寬度調(diào)制器。
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