Chapter: Digital Electronics : Combinational Circuits

Cascading BCD Adders

For adding numbers with several digits, a separate BCD adder for each digit position must be used.

CASCADING BCD ADDERS:

^§The previous circuit is used for adding two decimal digits only. That is, “ 7 + 6 = 13”.

^§For adding numbers with several digits, a separate BCD adder for each digit position must be used.

Example:

^§Determine the inputs and the outputs when the above circuit is used to add 538 to 247. Assume a CARRY IN = 0

^§Solution:

^§Represent the decimal numbers in BCD

247 = 0010 0100 0111

538 = 0101 0011 1000

Put these numbers in registers [A] and [B]

[A] = 0010 0100 0111

[B] = 0101 0011 1000

Example:

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Digital Electronics : Combinational Circuits : Cascading BCD Adders |