2位BCD码是二进制几位？

非压缩的是16位，压缩的是8位。
如：BCD码 12
如果是非压缩的，就是 01 02  (16进制)  0000 0001 0000 0010 (2进制)
压缩的，则是12 (16进制） 0001 0010 (8位)

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