Purpose serve by a simplest microprocessor

[Eshal]

Hello experts!

I want to know what a microprocessor can do?
I know, it can do addition, subtraction, multiplication, division with the help of its ALU
anything else a microprocessor do?

Thank you experts!

Princess

 

[jayanth.devarayanadurga]

XOR, AND, dataprocessing, and everything else it is made to do with a program.

 

[Eshal]

Can you provide me a block diagram for the simplest microprocessor? I think 4-bit microprocessor would be the simplest one. I want to design my own because I know digital electronics and analog too.

 

[uday mehta]

the simplest block diagram contain BIU, ALU, Paging unit, control unit and decode unit. can you know these all thing in detail and also can you design a chip? because if you want to build it by using individual component or some ics that means you want to go into 1970.

 

[Eshal]

I will design it on a bread board. Can I interface a small keyboard with this microprocessor too?
I want to design simplest one. Is there a 2-bit microprocessor to be called the simplest or 4-bit?

Yes, I know BIU, ALU, paging unit, control unit and decode unit. Ofcourse I am not an expert but I will also learn during designing.

 

[wp100]

Hi,

Think you might want to try something like this board which goes right down to the basic transistors circuit.
https://www.youtube.com/watch?v=xISG4nGTQYE

Do note that breadboards are not the most reliable mode of construction, particularly if they are old and the contacts dirty.

 

[uday mehta]

then start with decode unit. yes you have to interface a keyboard and 7 seg. display for writing your program. notice that here you are directly write the op code. in microprocesser 8085 3E use fore mov. you want to design your own which totally brand new then its depends on you that which command for move and which for add etc. think that how you decode that hexadecimal value into binary...

 

[nilses]

Hello,

I want to help you if you are serious about breadboarding a Computer on a testboard. Check out a chip called 74181.
4 bit ALU. Widely used in computers in the early '70. Like Military radars and so on. Your breadboard will be VERY big.

You can also consider an AMD2901 bit slice processor for your project , a very nice chip I used in 1986 latest.

Today we have PIC's and AVR's and MCS'51 + PDP11 and VAX11/785.

Much easier.
Nils

 

[Eshal]

Thank you for such nice replies and helps.

I will not directly start bread-boarding ofcourse. I will first design and simulate. I have simulator multisim.

First, recall me how many parts a microprocessor should consists of?
BIU
ALU
Paging unit
control unit
&
decode unit.
Right?

So should I start with Decode unit or ALU?

I am recalling that I want to make the simplest one first then I will move to the higher bits.

So tell me experts which is the lowest bit I can use for my microprocessor? Is it 2-bit microprocessor or 4-bit?

Thank you.

 

[nilses]

Hi,

Start with 4 bits. a 2 bit CPU is not very useful.

Check also this link: https://www.youtube.com/watch?v=lZ6gF0FYywg

With all respect Sir, Why do you want to do this experiment ? Educational ? Nice to do ?

 

[Eshal]

lol I am not a sir. I am a madam hehehehehehehehehe.....

And i want to experiment it for knowledge. So i will start with low to high.