描述
這3個(gè)層次各有各的應(yīng)用范圍。從應(yīng)用開(kāi)發(fā)角度看，在相當(dāng)長(zhǎng)的一段時(shí)間內(nèi)，都是采用前2種方法。第3層次設(shè)計(jì)方法對(duì)一般具體應(yīng)用人員來(lái)說(shuō)，只能用來(lái)設(shè)計(jì)簡(jiǎn)單的單片系統(tǒng)。而復(fù)雜的單片系統(tǒng)則是某些大的半導(dǎo)體廠商才能設(shè)計(jì)和實(shí)現(xiàn)的，并且用這種方法實(shí)現(xiàn)的單片系統(tǒng)，只可能是那些廣泛使用、具有一定規(guī)模的應(yīng)用系統(tǒng)才值得投入研制。還有些應(yīng)用系統(tǒng)，因?yàn)榧夹g(shù)問(wèn)題或商業(yè)價(jià)值問(wèn)題并不適宜用單片實(shí)現(xiàn)。當(dāng)它們以商品形式推出相應(yīng)單片系統(tǒng)后，應(yīng)用人員只要會(huì)選用即可。所以，3個(gè)層次的設(shè)計(jì)方法會(huì)并存，并不會(huì)簡(jiǎn)單地用后者取代前者。初級(jí)應(yīng)用設(shè)計(jì)人員會(huì)以第1種方法為主;富有經(jīng)驗(yàn)的設(shè)計(jì)人員會(huì)以第2種方法為主;很專業(yè)的設(shè)計(jì)人員會(huì)用第3種方法進(jìn)行簡(jiǎn)單單片系統(tǒng)的設(shè)計(jì)和應(yīng)用。但所有的設(shè)計(jì)人員都可以應(yīng)用半導(dǎo)體大廠商推出的用第3種方法設(shè)計(jì)的專用單片系統(tǒng)。
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