This article introduces the design and realization of four BCD encoder circuit take 8421 code as the example, this circuit draws out the BCD code connect with other circuit very conveniently.

以8421码为例介绍了4位BCD编码器电路的设计和实现，该电路引出的BCD编码接口可以很方便地与其他电路连接。

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METHO_ DS:Based on analysis of the status and problems of BCD used at present in China, the method and principle to standardize BCD were brought forward.

方法：分析我国BCD的现状，提出标准化药品项目代码和BCD的确定方法及原则。结果：统计结果表明，我国大多数处方药品包装上未印BCD ，且各生产厂商药品项目代码的编码方案无统一标准。

youdao

METHO_ DS:Based on analysis of the status and problems of BCD used at present in China, the method and principle to standardize BCD were brought forward.

方法：分析我国BCD的现状，提出标准化药品项目代码和BCD的确定方法及原则。结果：统计结果表明，我国大多数处方药品包装上未印BCD ，且各生产厂商药品项目代码的编码方案无统一标准。

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