# What do you mean by 1 bit BCD adder?

## What do you mean by 1 bit BCD adder?

A BCD adder adds two BCD digits and produces output as a BCD digit. A BCD or Binary Coded Decimal digit cannot be greater than 9. The sum is correct and in true BCD form. But if sum is greater than 9 or carry =1, the result is wrong and correction must be done. The wrong result can be corrected adding six (0110) to it.

## What is BCD adder example?

When we are simply adding A and B, then we get the binary sum. Here, to get the output in BCD form, we will use BCD Adder. Example 1: Input : A = 0111 B = 1000 Output : Y = 1 0101 Explanation: We are adding A(=7) and B(=8).

BCD adder refers to a 4-bit binary adder that can add two 4-bit words of BCD format. The output of the addition is a BCD-format 4-bit output word, which defines the decimal sum of the addend and augend and a carry that is created in case this sum exceeds a decimal value of 9.

### What are the rules of BCD Adder?

The BCD-Adder is used in the computers and the calculators that perform arithmetic operation directly in the decimal number system. The BCD-Adder accepts the binary-coded form of decimal numbers. The Decimal-Adder requires a minimum of nine inputs and five outputs.

### What is BCD code?

Binary Coded Decimal
We have seen here that Binary Coded Decimal or BCD is simply the 4-bit binary code representation of a decimal digit with each decimal digit replaced in the integer and fractional parts with its binary equivalent. BCD Code uses four bits to represent the 10 decimal digits of 0 to 9.

What is BCD adder explain with block diagram?

BCD adder refers to a 4-bit binary adder that can add two 4-bit words of BCD format. The output of the addition is a BCD-format 4-bit output word. Therefore, BCD adders can perform decimal addition. A BCD adder is a circuit that adds two BCD digits in parallel and makes a sum digit also in BCD.

Because each hexadecimal digit has 16 different values and BCD has only 10. Similarly, in BCD math, when the result of the addition is larger than 9 you add 6 to skip the 6 remaining “invalid” values and carry to the next digit.

#### What is BCD code example?

Using this conversion, the number 25, for example, would have a BCD number of 0010 0101 or 00100101. However, in binary, 25 is represented as 11001….BCD.

Decimal BCD
6 0110
7 0111
8 1000
9 1001

What is the BCD addition of 1101 and 1011?

Usually, in binary numbers, we represent (13)10 = (1101)2 i.e., we require 4-bits but in BCD notation (13)10 is represented as (0001 0011). Here, we require 8-bits to represent the same 13….Binary Coded Decimal (BCD Code) and its addition.

Decimal Numbers Binary Numbers 8421 BCD Numbers
10 1010 0001 0000
11 1011 0001 0001
12 1100 0001 0010
13 1101 0001 0011

## What is the BCD code of 10?

0001 0000
Truth Table for Binary Coded Decimal

Decimal Number BCD 8421 Code
9 0000 1001
10 (1+0) 0001 0000
11 (1+1) 0001 0001
12 (1+2) 0001 0010

## How many bits are in a BCD code?

BCD or Binary coded decimal is a way of representing decimal digits in binary form. Generally 4 bits are used to represent values 0 to 9. In this post we discuss about BCD addition.

What should the output of a BCD adder be?

The output of a BCD adder is also supposed to be in BCD format. So after the normal binary addition of the inputs, there should be a BCD adjustment code to convert the result to BCD format. Since the range of input is 0 to 9, the maximum output is 18.