data transfer instruction in assembly language

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Parth86

Member

• Nov 14, 2013

• #1

I know the data transfer instruction is used to move data. data can be move between memory, register and accumulator
different movement of data in assembly

accumulator to register mov R0, A
register to accumulator mov A, R0

how to write instruction for memory ( which memory is used for this)
memory to accumulator ?
memory to register ?

 

ericgibbs

Well-Known Member

Most Helpful Member

• Nov 14, 2013

• #2

hi vead,
Look at this link, it has a table of instructions for the 8051.
https://www.mikroe.com/chapters/view/66/chapter-3-the-8051-instruction-set/
E

 

P

Parth86

Member

• Nov 14, 2013

• #3

ericgibbs said:

hi vead,
Look at this link, it has a table of instructions for the 8051.
https://www.mikroe.com/chapters/view/66/chapter-3-the-8051-instruction-set/
E

Click to expand...

thanks its very useful can you tell me how to load the memory address i think when we use # then we can say we are loading the data and when we don't use # we can say we are loading the memory address
mov R0, #55h data is loading
mov R0, 55h address is loading

 

Ian Rogers

User Extraordinaire

Forum Supporter

Most Helpful Member

• Nov 14, 2013

• #4

You can load directly..

Code:

counter equ 0x30

mov A, counter
inc A
mov counter, A

Or indirectly using one of the registers

Code:

counter equ 0x30

mov R0,#counter

mov A, @R0
inc A
mov @R0, A

Oh yeah! the '#' means data without it will be location... In my example I load the value of counter into A
In the second, I load the actual location number into R0.

 

Last edited: Nov 14, 2013

ericgibbs

Well-Known Member

Most Helpful Member

• Nov 14, 2013

• #5

hi,
From your two 'MOV' instructions, I would say yes.
This Link explains the MOV instructions in detail.
**broken link removed**
E

 

P

Parth86

Member

• Nov 14, 2013

• #6

ok it means
MOV A,iram addr ( memory to accumulator)
MOV A , 55h where 55h is iram address

 

Ian Rogers

User Extraordinaire

Forum Supporter

Most Helpful Member

• Nov 14, 2013

• #7

If you have downloaded MPU51IDE... Just play with the commands to see them working for yourself...

The simulator is brilliant!!