assembly language

[Parth86]

suppose we want to add two 8 bit number
we have to implement 8 bit adder

example 6+ 2 =8
00000110
+00000010
------------
00001000

suppose we have binary sequence
Mov (1000)
Add (0100)
6(00000110)
2(00000010)
8(00001000)

machine language
1000 0110
1000 0010
0100 0110 0010

assembly language
mov A, #6
mov R1,#2
add A,R1

I know assembly code convert into machine code but for low level understanding how we developed assembly language to understand machine language

 

[Ian Rogers]

Assembly is the simplest symbolic languge there is....It's virtually impossile to work in binary so grouping the binary into a nmemonic helps remember the code....

 

[Parth86]

how we access memory and which instruction we use that determine weather we are accessing Internal rom , Internal Ram ?

how to access rom

example
Mov R0, #55H ; load R0 with 55H
Mov R1, #85H ; load R1 with 85H


how to access ram memory
Mov 00, #55H ; ram location 00 has 55H data
Mov 01 , #85H : ram location 01 has 85H data

 

[Ian Rogers]

example
Mov R0, #55H ; load R0 with 55H
Mov R1, #85H ; load R1 with 85H

how to access ram memory
Mov 00, #55H ; ram location 00 has 55H data
Mov 01 , #85H ; ram location 01 has 85H data

These two examples are the same... R0 and R1 are in position 0 and 1 in internal ram..

Movc is for rom and movx is for external ram...