;declare internal memory address's 30h to 32h as variables
;one to three

variable_one: .reg 30h ;could use any memory from 00h to 7fh
variable_two: .reg 31h
varianbe_three: .reg 32h

main:

mov a,#00h
mov b,#01h

mov variable_one,a ;set memory address 30h to '00h'
mov variable_two,b ;set memory address 31h to '01h'
mov variable_three,#02h ;set memory address 32h to '02h'

jmp $

end


;--------------------------------------------------------

yes you declare a variable for each ram location
your variables will be protected, unless you write to them, or you use the SFR part of internal memory (80h to FFh)