Binary Coded Decimal

Binary Coded Decimal or BCD is a process of converting decimal numbers to binary equivalents. In this type of encoding, every digit in a decimal number is represented in the form of bits. It can be done in either 4-bit or 8-bit. BCD is a preferred system of converting decimal to binary as it treats each digit as a separate single sub-circuit. 

The truth table for Binary Coded Decimal (BCD) is as follows:

In BCD, the decimal number is segregated into chunks of 4-bits for each decimal digit within the number. Every decimal is converted into its direct binary form.

For example:

Convert (123)10 in BCD 

From the truth table above, 

1=0001 

2=0010 

3=0011 

Therefore, BCD becomes:

0001 0010 0011. 

Reference

Binary Coded Decimal