Assembly does not have variables in the same sense as high-level programming languages. Instead, it uses registers to store data.
; Move a value into a register
mov eax, 42
; Move a value from one register to another
mov ebx, eax
Assembly does not have functions in the same sense as high-level programming languages. Instead, it uses subroutines to perform specific tasks.
; Define a subroutine
mySubroutine:
; do something
ret
; Call a subroutine
call mySubroutine
Assembly uses jump instructions to create loops.
; Define a loop
myLoop:
; do something
jmp myLoop
Assembly uses conditional jump instructions to create if-else statements.
; Define an if-else statement
cmp eax, ebx
jg greaterThan
jmp lessThan
greaterThan:
; do something
jmp endIf
lessThan:
; do something else
jmp endIf
endIf:
Assembly uses specific instructions to interact with hardware.
; Set up a digital pin
mov al, 0xFF
out 0x02, al
; Turn on and off an LED
mov al, 0x01
out 0x02, al
mov al, 0x00
out 0x02, al