Data Memory Map
Address	Offset	Data
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32	0
33	1
34	2
35	3
36	4
37	5
38	6

Objective

Learn the basic structure of an assembly program, how to read the 8-bit instruction set reference and become familiar with a few commands.

Lab

Task 1: Walk through the assembly program below and fill out the data memory map (right). If a value changes during the program, you only need to record the final value. Unless otherwise stated all memory locations contain a value of 0.

;Program for task 1

;Definitions

.EQU myData=0x21

.DEF config=R4

;Main

.CSEG

.ORG 0x0000

LDI R16, 0b00001000

MOV R0, R16

LDI R16, 0b10010011

MOV R1, R16

LDI R16, 0b01010101

ANDI R16, 0b00001111

MOV R2, R16

ORI R16, 0b10100101

LDI R17, 20

ADD R17, R16

MOV R3, R16

MOV config, R17

OUT 0, R3

CBI 0, 1

IN R5, 0

STS myData, R0

SBI 1, 6

SBI 1, 7

LDS R6, myData

Task 2: In a few sentences, describe what is being done with the program below. Make sure to use specific data values and addresses.

;Program for task 2

;Definitions

.equ myBit=4

.def temp=R16

;Some data storage

.dseg

someData:

;Main

.cseg

ldi temp, 0b11110000

ldi R17, 3

add temp, R17

sts someData, temp

Task 3: Write an assembly program that computes the value of a function. Your program can assume the input has already been stored in R16 prior to your program running. Without modifying R16, make a calculation using the following equation. (Hint: Use the ADD, SUB, and MUL commands)

f(x) = x²-x+1 where x=R16

Store the value f(x) in SRAM at address 0x100. You can ignore overflows and carry bits.