Correct Template for an Assembly Program

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Correct Template for an Assembly Program



I have just started off with assembly and was looking at some sample programs shared by the instructor, for example, the below program to swap 2 numbers.


ORG 0h
; This line tells the MCR to place the first instruction at add 0
LJMP main
; This line transfers the control to the main block unconditionally
ORG 100h
; Why do we need this? The code if for the 8051 which has a total RAM range
; of 256B, so this address seems out of range
main:
MOV 70H,#20H
MOV 71H,#21H

MOV A,70H
MOV 70H,71H
MOV 71H,A
; The accumulator A acts like a temp in a simple C program

HERE:SJMP HERE
; What is the purpose of this line?
END



Kindly help in resolving my questions (as code comments) about this template









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