degree stuff

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OK people this is a question for anybody really as im stuck on some assignment and i dont know what way tp turn.

Basically we have to specify and design a suitable insrtuction set format for a new small embedded mircocontroller. This then has to presented in the form of a data sheet. Has anyone had to endure this task in some form or other and if so could you please pont me in the right direction.

Ed

 

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Your tutor.

 

Why don't you look at other instruction sets ? Typically theres like 20 essential op codes and upto 200 in real world processors.

Things like

load
store
branch not equal
branch greater than
branch less than
branch equal
test
add
subtract
multiply
divide
and
or
xor
not
nand
shift arithmetic right
shift arithmetic left

etc...

These often closely resemble the operators and control statements you get in higher level languages...

The legendary Donald Knuth invented MMIX as a virtual assembler to allow him to publish his low level algorithms.

http://en.wikibooks.org/wiki/Transw...purpose_fictional_computer:_MMIX.2C_MMIXAL.5D

 

Why not look at some data sheets from Intel and Motorola to get an idea as to layout?

Harry.

 

Hi guys thanks for your input ill look at them links now.

Ed

 

Assembler and Microcode still underpins half the modern world. You can also look at things like MSIL or Java Bytecode.

http://weblogs.asp.net/kennykerr/archive/2004/09/07/introduction-to-msil-part-1-hello-world.aspx

http://en.wikipedia.org/wiki/Java_bytecode

PIC chips are used in a lot of modern electronics, they can have as few as 35 op codes.

http://en.wikipedia.org/wiki/PIC_microcontroller

There you go google and 10 minutes and homeworks practically done, gee I wish they had the internet when I was at college !

Intel (CISC) instruction set :-
http://www.intel.com/design/processor/manuals/253666.pdf

AVR (RISC) instruction set :-
http://en.wikipedia.org/wiki/Atmel_AVR_instruction_set

MISC :-
http://en.wikipedia.org/wiki/Minimal_instruction_set_computer
http://www.rdrop.com/~cary/html/minimal_instruction_set.html
http://www.ultratechnology.com/misc.html