1 / 2

( 1 ) 8421 码

( 1 ) 8421 码. 选取 0000~1001 表示十进制数 0~9 。 按自然顺序的二进制数表示所对应的十进制数字。 是有权码,从高位到低位的权依次为 8 、 4 、 2 、 1 ,故称为 8421 码。 1010~1111 等六种状态是不用的,称为禁用码。. 例: ( 1985 ) 10 = ( 0001 1001 1000 0101 ) 8421BCD. ( 2 ) 5421 码. 选取 0000~0100 和 1000~1100 这十种状态。 0101~0111 和 1101~1111 等六种状态为禁用码。

nell-banks
Télécharger la présentation

( 1 ) 8421 码

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. (1)8421码 • 选取0000~1001表示十进制数0~9。 • 按自然顺序的二进制数表示所对应的十进制数字。 • 是有权码,从高位到低位的权依次为8、4、2、1,故称为8421码。 • 1010~1111等六种状态是不用的,称为禁用码。 例: (1985)10 =(0001 1001 1000 0101)8421BCD

  2. (2)5421码 选取0000~0100和1000~1100这十种状态。 0101~0111和1101~1111等六种状态为禁用码。 是有权码,从高位到低位的权值依次为5、4、2、1。 (3)余3码 选取0011~1100这十种状态。 与8421码相比,对应相同十进制数均要多3(0011),故称余3码。

More Related