FX61A BN624A283H03
A61L-0001-0086
FX61A BN624A283H03
Fu Zhou ZhuoKai Electric Co., Ltd.
1.邏輯常量與變量:邏輯常量只有兩個,即0和1,用來表示兩個對立的邏輯狀態。邏輯變量與普通代數一樣,也可以用字母、符號、數字及其組合來表示,但它們之間有著本質區別,因為邏輯變量的取值只有兩個,即0和1,而沒有中間值。
2.邏輯運算:在邏輯代數中,有與、或、非三種基本邏輯運算。表示邏輯運算的方法有多種,如語句描述、邏輯代數式、真值表、卡諾圖等。
3.邏輯函數:邏輯函數是由邏輯變量、常量通過運算符連接起來的代數式。同樣,邏輯函數也可以用表格和圖形的形式表示。
4.邏輯代數:邏輯代數是研究邏輯函數運算和化簡的一種數學系統。邏輯函數的運算和化簡是數字電路課程的基礎,也是數字電路分析和設計的關鍵。
式中小圓點“·”表示A、B 的與運算,又稱邏輯乘。在不致引起混淆的前提下,乘號“·”被省略。某些文獻中,也有用符號 ∧、∩表示與運算的。
真值表:如果開關不通和燈不亮均用0表示,而開關接通和燈亮均用1表示,得到如圖1(c)所示的真值表描述。真值表的左邊列出為所有變量的全部取值組合,右邊列出的是對應于A,B變量的每種取值組合的輸出。因為輸入變量有兩個,所以取值組合有22=4種,對于n個變量,應該有2n種取值組合。
福州卓凱電子科技有限公司
【誠信】 【質量保證】 【價格優惠】
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