Answer to Question #4831 in Assembler for LLawliet

Question

Consider the following AVR Assembly Language Code which is passed through an assembler.

.include "m64def.inc"
jmp RESET
jmp HANDLER_1

.dseg
var1: .BYTE 1
var2: .BYTE 3


.cseg
const: .DB 0xAA, 0xCC
.org 0x20
reset:
ldi ZL, low(var1)
ldi ZH, high(var1)
ldi r17, 0xBB
st Z, r17
ldi ZL, low(const<<1)
ldi ZH, high(const<<1)
lpm
.dseg
var3: .BYTE 4
.cseg
mainloop:
ldi r20, 0xF0
...

Determine the segments and values of each of the following symbols. (Enter the segment as either "cseg" or "dseg" - without the quotes. Enter the values as decimal integers.).
Symbol Segment Value
var1
var3
reset
const
mainloop
(This is a table - fill it in)

Answer 1

Symbol Segment Value
var1 dseg 0xFF
var3 dseg 0xFF
reset cseg 2 (0x02)
const cseg 0 (0x00)

mainloop cseg 10 (0x0A)





All instructions have 1-word(2 bytes) length. Every word has it's own address. var1 and var3 are not initialized, 1 and 3 show how many bytes are
reserved.