IC697BEM733

IC697BEM733在單片機(jī)軟件設(shè)計架構(gòu)中，一段程序循環(huán)執(zhí)行是其一個特點，也是一個弊端。每個操作指令的執(zhí)行都需要一定的執(zhí)行時間，如果程序沒有執(zhí)行到該指令，則該指令的動作就不會觸發(fā)，這樣就會忽略許多快速發(fā)生的事件，例如方波頻率檢測的上升沿。針對在單片機(jī)程序正常運行時能夠?qū)ν獠渴录⒓醋龀鲰憫?yīng)而設(shè)計了中斷功能。當(dāng)中斷功能執(zhí)行時，單片機(jī)優(yōu)先處理中斷程序，當(dāng)中斷處理完成后，再回到單片機(jī)的正常程序執(zhí)行中。中斷的機(jī)理是比較容易理解的，但是什么時候打開中斷，什么時候關(guān)閉、屏蔽中斷，需要如何配置才能使能中斷的某些功能，中斷里要執(zhí)行哪些程序，這些程序的要滿足哪些要求就需要花些時間去理解與實踐了。中斷學(xué)會后，就可以編寫復(fù)雜結(jié)構(gòu)功能的程序，可以一邊閃著小LED燈，一邊掃描著按鍵，一邊發(fā)送著數(shù)據(jù)，也可以干著多個事情……打個比喻，中斷功能可以使單片機(jī)吃著碗里的，看著鍋里的。根據(jù)傳說中的8020定律，如果您掌握了上面提到的這四步，那么，您已經(jīng)學(xué)會了80%的內(nèi)容了。

IC697BEM733◆ 聯(lián)系人： 陳女士）
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