IC660EBD101
IC660EBD101
IC660EBD101
異步傳輸方式中,字符是數(shù)據(jù)傳輸單位。在通信的數(shù)據(jù)流中,字符間異步,字符內(nèi)部各位間同步。異步通信方式的“異步”主要體現(xiàn)在字符與字符之間通信沒有嚴(yán)格的定時(shí)要求。異步傳送中,字符可以是連續(xù)地、一個(gè)個(gè)地發(fā)送,
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也可以是不連續(xù)地,隨機(jī)地進(jìn)行單獨(dú)發(fā)送。在一個(gè)字符格式的停止位之后,立即發(fā)送下一個(gè)字符的起始位,開始一個(gè)新的字符的傳輸,這叫做連續(xù)的串行數(shù)據(jù)發(fā)送,即幀與幀之間是連續(xù)的。斷續(xù)的串行數(shù)據(jù)傳送是指在一幀結(jié)束之后維持?jǐn)?shù)據(jù)線的“空閑”狀態(tài),新的起始位可在任何時(shí)刻開始。一旦傳送開始,組成這個(gè)字符的各個(gè)數(shù)據(jù)位將被連續(xù)發(fā)送,并且每個(gè)數(shù)據(jù)位持續(xù)的時(shí)間是相等的。接收端根據(jù)這個(gè)特點(diǎn)與數(shù)據(jù)發(fā)送端保持同步,從而正確地恢復(fù)數(shù)據(jù)。收/發(fā)雙方則以預(yù)告約定的傳輸速率,在時(shí)鐘的作用下,傳送這個(gè)字符中的每一位。
握手信號實(shí)際上是控制信號,用來控制數(shù)據(jù)的傳送。通過握手信號,發(fā)送方可以通知接收方是否有數(shù)據(jù)要發(fā)送。接收方通過握手信號通知發(fā)送方它是否已經(jīng)準(zhǔn)備好了接收信號。握手信號遵循某種協(xié)議。
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