Microprocessors: Can we do 16 bit multiplication on 8 bit processor?

rishi0922

@rishi0922-a2xTAa • Oct 26, 2024

Oct 26, 2024

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Can we do 16 bit multiplication on 8 bit microprocessor ?

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Morningdot Hablu

@morningdot-6Xuj4M • Sep 7, 2010

Re: Microprocessors

How it can be possible.
Think if it is possible then why we make 16-bit and 32-bit microprocessor.

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rishi0922

@rishi0922-a2xTAa • Sep 7, 2010

Re: Microprocessors

Hey mohit i have not asked it in a fun . I have done 16 bit multiplication on 8 bit MP that's why i am asking it that how it is possible and why it is possible ?

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silverscorpion

@silverscorpion-iJKtdQ • Sep 7, 2010

Ya it's possible.

8 bit, 16 bit etc.. it just says how many bits the microprocessor can process at a time.
For an 8 bit processor, it can only process 8 bits simultaneously. A 16 bit MP can process 16 bits at a time..

But, multiplication is nothing but repeated addition, right? So, even with 8 bit processor, we can do 16 bit multiplication.

@Mohit: we make 16 bit and 32 bit processors because, they are faster. You can definitely do 32 bit multiplication in a 8 bit processor.
But it will take a lot more time than it does in a 32 bit processor. That's why!!

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rishi0922

@rishi0922-a2xTAa • Sep 7, 2010

Thanks silverscorpion.....this explanation only i wanted..../

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Morningdot Hablu

@morningdot-6Xuj4M • Sep 8, 2010

@silverscorpion You mean to say that if we want to do a 16-bit multiplication on a 8-bit microprocessor we need two processes(8-bit multiplication and again 8-bit multiplication).

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rishi0922

@rishi0922-a2xTAa • Sep 8, 2010

No mohit not like that, in case of 16 bit multiplication we give two 8 bit inputs in the address simultaneously in 8 bit MP because it can process only 8 bit at a particular time so by giving two 8 bits simultaneously it can process both simultaneously for 16 bit multiplication.......

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Morningdot Hablu

@morningdot-6Xuj4M • Sep 8, 2010

Thanks for correcting me rishi..!!
Keep up your nice work..!!

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medeepak

@medeepak-zZfLKg • Sep 9, 2010

we can do it
definitely yes
but it will not be time efficient

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arjun poduval

@arjun-poduval-7gT5XQ • Sep 9, 2010

It is possible to do it... you can perform multiplication of 16 bit numbers on a 8085 or other 8-bit processors..
feed the values separately as two 8-bit values..
But you definitely have certain constrains regarding the time and complexity...

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jensiline

@jensiline-yki91x • Sep 12, 2010

16 bit multiplication is not possible in 8085 because it's an 8 bit processor.If we multiply 16*16 bit we got a result as 32 bit.
But we can do 16 bit addition in 8085

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rishi0922

@rishi0922-a2xTAa • Sep 13, 2010

@jensiline:
I wan't to correct you here,
in case of 16 bit multiplication suppose we take following inputs...

address: 4107 4108 410A 410B
data: 02 04 03 01

then we get the output as follows...

address: 4150 4152
data: 06 04

here 4150 & 4152 is the output address..

Hence, by this example we came to know that all the 4 inputs given are 8 bit and we are saying this as a 16 bit multiplication because two 8 bit inputs are getting multiplied.
So we can see here clearly that the inputs of 4107 and 410A are getting multiplies, same for 4108 and 410B....

I hope you can get something from this example, if you are having any question regarding this then feel free to ask .

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liveaspankaj

@liveaspankaj-yYbE3g • Sep 18, 2010

Yes obviously.

Think like this, we use a computer with a 32 bit processor but we are able to do very huge calculations. Its just about the steps.

But then what steps?
Its like when we learn multiplication we learn tables from 2 to 10 and then we are about to do multiplication of almost anysize depending on how much time we have.
So, in this case our brain becomes a 1 digit multiplier, and we do 1 digit multiplications and some additions on the way and multiply even 5 digit numbers.

We do the same for processors, microcontrollers or any computer.

Enjoy!

Keep Smiling 😀
Pankaj

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