Viva Question: How Do Registers Work?

@abrakadabra • Oct 26, 2024

Oct 26, 2024

1.1K

I had a viva last week and I was asked this question.
To put it descriptively, the professor asked me we all know that 8085 is a 8-bit microprocessor and 8086 is a 16-bit microprocessor.
When we say that a register in 8085 stores 8 bit data, what actually happens inside the register?
And what changes were made to the hardware of 8085 to convert it to a 16-bit microprocessor?

Could someone explain the answer to both the above questions?

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narayana murthy

@narayana-z4W16q • Feb 5, 2011

Ok i can give the answer upto i know register stores 1 bit of data by alliening the registers no. Of bits will be increased
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silverscorpion

@silverscorpion-iJKtdQ • Feb 5, 2011

Well, a register is nothing but a collection of flip-flops.. so, an 8 bit register may have 8 flip-flops, while a 16 bit register will have 16 flip-flops in it..

You can check the architecture of 8085 and 8086..

And as to what actually happens in a register, it's easy. The states of the flip-flops are changed according to the word that is written.
When it's a read operation, the states of the flip-flops are read out..
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Sachin Jain

@sachin-0wuUmc • Feb 5, 2011

I think 16-bit register means two 8 bit registers.
Their arrangement may be of two types..
little endian and big endian.

Though i am not sure....please check..
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narayana murthy

@narayana-z4W16q • Feb 5, 2011

i think we dont exactly combine two 8 bit flipflop's we can make 16 bit register by connecting 16 filpflops in parallel and it becomes as a register each flipflop can store 1 byte of memory
if we see the flipflop circuit diagram we can know how it stores memory
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