as far as data is stored on any media, it is just a sequence of bits organized in larger entities according to the hardware architecture;
the definition of its nature is a convention according to the use You make of the data itself.
let' s make an example for 8 bits:
bit sequence 1100 0001
hexadecimal representation "c1"
numeric value 193
alphanumeric value "A"
so the fact that a sequence of bits is representing a packed decimal number can not be made into a bidirectional assumption
for example ( in hexadecimal representation )
x"000C" can be interpreted as the D.P value of zero,
or simply as a binary value of 12
All this to imply that Your request is not clear enough