Tools to code/decode in BCD. BCD (binary coded decimal) is a numeration system used in electronics and informatics to code decimal numbers on 4 bits (in binary).

Binary Coded Decimal (BCD) - dCode

Tag(s) : Electronics, Informatics

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Tools to code/decode in BCD. BCD (binary coded decimal) is a numeration system used in electronics and informatics to code decimal numbers on 4 bits (in binary).

BCD encoding replaces directly digits 0, 1, 2, ..., 9 by their binary values 0000, 0001, 0010, 0011, 0100, 0101, 0110, 0111, 1000 and 1001

Example: Coding 123 is replacing 1 by 0001, 2 by 0010 et 3 by 0011, so 123 is coded 0001 0010 0011 in BCD

BCD conversion replaces each 4bit group by its corresponding digit

Example: 0001 0010 0011 is decoded 1,2,3

The message has a length multiple of 4 and never contains 1111.

Some systems uses 1100 for + and 1101 for -

Example: -5 is then written 1101 0101

It is possible to use 1100,1101 or 1110 for the decimal dot, bu more often the position of the decimal dot is fixed a priori.

Example: For example, id the dot is in 2nd position, 123 will be read 1.23.

BCD is often used in electronics, for storing or displaying numeric values. Conversion is easy, does not need a processor and is similar to peripherals such as 7-segment displays.

Another example is the storing of Dates in a BIOS of a motherboard, still today in BCD.

Unused values are 1010, 1011, 1100, 1101, 1110, 1111

Between 1950 and 1960

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