【導(dǎo)讀】設(shè)計(jì)一個(gè)具有特定功能的電子鐘。該電子鐘上電或按鍵復(fù)位后能自動(dòng)顯示系統(tǒng)提示符“P.”，進(jìn)入時(shí)鐘準(zhǔn)備狀態(tài)；第一次按電子鐘啟動(dòng)/調(diào)整鍵，電子鐘從0時(shí)0分0秒開始運(yùn)行，進(jìn)入時(shí)鐘運(yùn)行狀態(tài)；再次按電子鐘啟動(dòng)/調(diào)整鍵，則電子鐘進(jìn)入時(shí)鐘調(diào)整狀態(tài)，此時(shí)可利用各調(diào)整鍵調(diào)整時(shí)間，調(diào)整結(jié)束后可按啟動(dòng)/調(diào)整鍵再次進(jìn)入時(shí)鐘運(yùn)行狀態(tài)。設(shè)計(jì)一個(gè)能夠測(cè)量矩形波信號(hào)的頻率、周期、脈寬、占空比的頻率計(jì)。將AT89S52的串行口擴(kuò)展成并行口,外接LED數(shù)碼管顯示器；P1口外接四個(gè)按鍵A、B、C、D。、以上兩個(gè)課題可以任選其一或全選，學(xué)生也可以自定課題；、計(jì)算機(jī)打印《單片機(jī)技術(shù)》課程設(shè)計(jì)說明書一份；參照“《單片機(jī)技術(shù)》課程設(shè)計(jì)說明書正文主要內(nèi)容”文件。此電子鐘嚴(yán)格按照要求設(shè)計(jì)，最終達(dá)到預(yù)期的效果，能夠正確顯示“P”點(diǎn)以及時(shí)分秒的計(jì)時(shí)，算是一次比較成功的設(shè)計(jì)了。、調(diào)整狀態(tài)，按偶數(shù)次A鍵進(jìn)入，在此狀態(tài)下，按A、B、C、D鍵均有效。

　　

【正文】 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