Lab 1 Addressing Modes

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FACULTY OF ELECTRICAL ENGINEERING

UNIVERSITI TEKNOLOGI MARA

INTRODUCTION TO MICROPROCESSOR SYSTEMS LABORATORY (ECE354)

Lab Experiment : Experiment #1

Title of Experiment : Directive Assembler and Addressing Modes of

68HC12 Assembly Language Programming

Group :

Dateline : 4 February 2016

Members :

No. Name Matrix Card No.

1

2

3

Assessments :

riteria Marks

Programming .lst (complete with comments) /10

Results /20

Discussions /20

Conclusions /10

Questions /40

Total marks /100


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ECE354 Introduction to Microprocessor System

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Siti Sara Binti Rais

FKE UiTM Dungun Page 2

Contents

EXPERIMENT 1 ....................................................................................................... 3

1.0 OBJECTIVES ..................................................................................................... 3

2.0 LIST OF REQUIREMENTS ............................................................................ 3

2.1 Equipments .................................................................................................... 3

3.0 THEORY .......................................................................................................... 3

4.0 PROCEDURE 1 ............................................................................................... 5

4.1 QUESTION 1 ................................................................................................ 6

5.0 PROCEDURE 2 ............................................................................................... 6

5.1 QUESTION 2 ................................................................................................ 8

6.0 QUESTION 3 ................................................................................................... 8

7.0 INSTRUCTIONS ...........................................................................................10

8.0 REFERENCES ...............................................................................................10

Appendix 1 ...........................................................................................................11


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FACULTY OF ELECTRICAL ENGINEERING

UNIVERSITI TEKNOLOGI MARA

________________________________________________________________

INTORDUCTION TO MICROPROCESSOR SYSTEMS LABORATORY(ECE354)

EXPERIMENT 1

DIRECTIVE ASSEMBLER AND ADDRESSING MODES OF 68HC12 ASSEMBLYLANGUAGE PROGRAMMING

1.0 OBJECTIVES

i) To understand the directives assembler of 68HC12

ii) To understand the fundamental of addressing modes in 68HC12

iii) To determine the machine language and content inside the CPU registers and

memory

2.0 LIST OF REQUIREMENTS

2.1 Equipments

1. Personal Computer

2. Installer of J2RE

3. Installer of MiniIDE

4. Installer of HC12SIM

5. Power supply

3.0 THEORY

A 68HC12 instruction consists of one or two bytes of opcode and zero to five bytes of

operand addressing information. The opcode byte(s) specifies the operation to be performed


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and the addressing modes to be used to access the operand(s). The first byte of a two-byte

opcode is $18.

Addressing modes determines how the CPU accesses memory locations to be operated

upon. Addressing modes supported by the 68HC12 are summarized in Table 3.0.

Table 3.0


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4.0 PROCEDURE 1

1. Install all the software required by the experiment.

2. Write a program as Figure 4.0 in MiniIDE with comments, translate to the list file and

machine file.

ORG $0800 ;DIRECTIVE ASSEMBLER TABLE1: DC.B 20,98,56,48 ; store the data into memory TABLE2: DC.W $3E,$F4VAR1: DS.W 5 ;reserve the memory for future use TABLE3: DC.L 25

ORG $0900 ;ADDRESSING MODES TYPES : INH,IMM,EXT LDX #$20FF ; X


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4.1 QUESTION 1

Draw a table as illustrated in Table Q1 and show each instruction in Procedure 1 correspond to

the machine code. Determine its addressing mode.

Table Q1Address of

memory

Machine code Mnemonic Addressing Mode

ORG $2000 Directive Assembler

$2000 CC 98 3E LDD #$983E Immediate Mode

$2003 O2 INY Inherent Mode

END Directive Assembler

5.0 PROCEDURE 2

1. Write a program as Figure 5.0 in MiniIDE with comments, translate to the list file and

machine file.

ORG $0800 ;Indexed addressing modes LDAA 2,X ; A


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Table 5.0

CPU registers /

Memory

Initial value

A 73H

B 68H

IX 0900H

IY 09FFH

SP 0B00H

PC 0800H

$0902 A6H

$090F 09H

$0910 80H

$0980 BFH

$0A0C E1H

$0AF9 3EH

$0AFA 8CH

3. Write a discussion regarding to this procedure. (Hint: State type of addressing modes

that are using in Procedure 1 and explain them)


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5.1 QUESTION 2

Draw a table as illustrated in Table Q2 and show each instruction in Procedure 2 correspond to

the machine code. Determine its addressing mode.

Table Q2

Address of

memoryMachine code Mnemonic Addressing Mode Range of offset

ORG $0900 Directive Assembler

$0900 A6 43 LDAA 3,Y 5-bit offset constant

index addressing

(IDX)

-16 to 15

$0902 6B E2 D11B STAB -12005,X 16-bit offset

constant inex

addressing (IDX2)

-32,768 to 32,767

And 0 to 216-1

END Directive Assembler

6.0 QUESTION 3

1. Write a program to load an immediate data to accumulator as following :

A =89, B = 65, X = 1000H, Y=2000H

2. Write a program to store a group of data in memory with starting address at $0900 as

Table 6.02.

Table 6.02

Address of

memoryData/Content

$0900 85H

$0901 00H

$0902 00H

$0903 00H

$0904 00H


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$0905 DDH

$0906 AAH

3. Write a program to execute actions as Table 6.03, and then determine its addressing

mode.

Table 6.03

Instruction

numberExecutions

0 Start your program at $0800

1 Load the contents of the memory location into

accumulator A with the address equal to the sum of

the values of accumulator B and index register Y.

A


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4. Identify the addressing modes for the following instructions:i) LDAA 10,Xii) STAB 100,Yiii) LDX -1,Yiv) STAA -18,Xv) ABA

vi) LDY #$2525vii) STAA $1500

7.0 INSTRUCTIONS

Pre-lab:

1. Fill in the result table.

2. Before participating first lab session, please refer to the module Chapter 3 and learn how to

use MGTEK MiniIDE and simulator at home. You can also refer to sitisararais.blogspot.com

and open in Blendspace for further clarification.

Group works:

Your final report should be included:

1. Front page.

2. Programming:List file of your programming include comments as Figure 7.0.

Figure 7.0

3. Result table.

4. Discussion for each procedure.

5. Answer all the questions.

6. Conclusion of your experiments.

7. Submit before the dateline given.

8.0 REFERENCES

[1] S. F. Barret and D. J. Pack. (2005). Embedded Systems : Design and Application with the68HC12 and HCS12.

[2] H.-W. Huang. (2009). Introduction to the 68HC12 Microcontroller .


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Appendix 1

Table 1 procedure 1

Address of memory Data/content of memory

Before execution

dc.b 20,98,56,48

dc.w $3E,$F4

ds.w 5


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dc. l 25

CPU Register A B X Y SP

Before

execution

LDX #$20FF

INX

LDY #$10AA

INY

LDAA #$EE

LDAB #$CC

DECA

ABA

LDS $902


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Table 2 Procedure 2

Instruction

Before execution After execution

CPU

register

Data in

CPU

Register

Address of

memory

Data in

memory

CPU

register

Data in

CPU

Register

Address

of

memory

Data in

memory

LDAA 2,X

STAB -7,Y

LDAB -244,SP

STAA 100,PC

LDD B,Y

LDAA [15,X]

STAA 2,SP-

LDX 5,-SP

STAA 4,+SP

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Lab 1 Addressing Modes