數(shù)字邏輯電路 (1)

1、2021/6/1612021/6/1622021/6/1632021/6/1642021/6/1652021/6/1662021/6/167“現(xiàn)2021/6/1682021/6/1692021/6/16102021/6/16112021/6/16122021/6/16132021/6/16142021/6/1615imniinnmmmmaaaaaaS101010101010)(11100221110 )90(ia2021/6/16162021/6/1617 1110022112222222)(mniiinnmmmmaaaaaaS) 10(ia2021/6/16182021/6/1619i8 1

2、110022118888888)(mniiinnmmmmaaaaaas)70(ia2021/6/16202021/6/1621 11100221116161616161616)(mniiinnmmmmaaaaaas)0(Faii162021/6/16222021/6/16232021/6/1624乘法：000；010；100；1112021/6/16252021/6/16262021/6/16272021/6/16282021/6/16292021/6/16302021/6/1631例2 (1011101.0110101)2=(5D.6A)16的逆過程進行轉(zhuǎn)換。(3) 八進制數(shù)和十六進制數(shù)轉(zhuǎn)換

3、為二進制數(shù)按上例2021/6/16322021/6/16332021/6/16342021/6/16352021/6/16362021/6/16372021/6/16382021/6/16392021/6/16402021/6/16412021/6/1642 若二進制小數(shù)序列為:X0.X1Xn則:2021/6/16432021/6/16442021/6/16452021/6/16462021/6/16472021/6/16482021/6/16492021/6/16502021/6/16512021/6/16522021/6/16532021/6/16542021/6/16552021/6/1

4、6562021/6/16572021/6/16582021/6/16592021/6/16602021/6/16612021/6/16620.1100+ 1.110110.100110.10102021/6/1663精度要求很高的數(shù)其范圍往往較小，如半導(dǎo)體制造工藝中以微米、亞微米計。 在有限位數(shù)的前提下，既能表示絕對值很大的數(shù)（相對分辨率降低），也可以具有很高的精度（相對數(shù)值范圍減少）。2021/6/1664 實質(zhì)上是讓小數(shù)點不固定，根據(jù)需要浮動，故稱浮點表示法。2021/6/16652021/6/16662021/6/16672021/6/16682021/6/1669一、8421碼(1)權(quán)位分別為8421，其按自然二進制數(shù)的規(guī)律排列，不允許出現(xiàn)10101111這6種代碼。特點:2021/6/16702006 0010 0000 0000 0110例：把十進制數(shù)變成8421BCD碼數(shù)串?；驈腂CD到字符的轉(zhuǎn)換操作。相同。有利于簡化輸入輸出過程中，從字符到BCD(3) 8421碼的編碼值與字符09的ASCII碼低四位2021/6/1671二、余三碼2021/6/1672 按5421編碼設(shè)計的十進制計數(shù)器最高位輸出為方波(連續(xù)5個0后連續(xù)5個1)。2021/6/16732021/6/16742021/6/16752021/6/