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AVR Assembler

Preface

Welcome to the Microchip AVR® Assembler.

The Assembler generates fixed code allocations, consequently no linking is necessary.

The AVR Assembler is the assembler formerly known as AVR Assembler 2 (AVRASM2). The former

AVRASM distributed with AVR Studio® 4 has now been obsoleted and will not be distributed with current

products.

For documentation on the instruction set of the AVR family of microcontrollers, refer to the 8-bit AVR

Instruction Set Manual.

Table of Contents

Preface............................................................................................................................ 1

1. AVR Assembler Known Issues.................................................................................. 4

2. AVR Assembler Command Line Options...................................................................7

3. Assembler Source....................................................................................................11

4. AVR Assembler Syntax............................................................................................12

4.1. Keywords....................................................................................................................................12

4.2. Preprocessor Directives............................................................................................................. 12

4.3. Comments..................................................................................................................................12

4.4. Line Continuation....................................................................................................................... 12

4.5. Integer Constants.......................................................................................................................12

4.6. Strings and Character Constants............................................................................................... 12

4.7. Multiple Instructions per Line......................................................................................................13

4.8. Operands....................................................................................................................................13

5. Assembler Directives...............................................................................................14

5.1. BYTE..........................................................................................................................................14

5.2. CSEG......................................................................................................................................... 14

5.3. CSEGSIZE................................................................................................................................. 14

5.4. DB.............................................................................................................................................. 15

5.5. DD.............................................................................................................................................. 15

5.6. DEF............................................................................................................................................ 16

5.7. DQ..............................................................................................................................................16

5.8. DSEG......................................................................................................................................... 16

5.9. DW............................................................................................................................................. 17

5.10. ELIF and ELSE...........................................................................................................................17

5.11. ENDIF.........................................................................................................................................17

5.12. ENDM and ENDMACRO............................................................................................................18

5.13. EQU............................................................................................................................................18

5.14. ERROR...................................................................................................................................... 18

5.15. ESEG......................................................................................................................................... 19

5.16. EXIT........................................................................................................................................... 19

5.17. IF, IFDEF, and IFNDEF...............................................................................................................19

5.18. INCLUDE....................................................................................................................................20

5.19. LIST............................................................................................................................................20

5.20. LISTMAC....................................................................................................................................21

5.21. MACRO......................................................................................................................................21

5.22. MESSAGE..................................................................................................................................21

5.23. NOLIST...................................................................................................................................... 22

5.24. ORG........................................................................................................................................... 22

5.25. OVERLAP and NOOVERLAP....................................................................................................23

5.26. SET............................................................................................................................................ 23

5.27. UNDEF.......................................................................................................................................23

AVR Assembler

5.28. WARNING.................................................................................................................................. 24

6. Preprocessor........................................................................................................... 25

6.1. #define........................................................................................................................................25

6.2. #undef........................................................................................................................................ 25

6.3. #ifdef...........................................................................................................................................26

6.4. #ifndef.........................................................................................................................................26

6.5. #if and #elif.................................................................................................................................26

6.6. #else...........................................................................................................................................27

6.7. #endif..........................................................................................................................................27

6.8. #error, #warning, and #message................................................................................................27

6.9. #include...................................................................................................................................... 28

6.10. #pragma, General Purpose........................................................................................................28

6.11. #pragma, AVR Part Related....................................................................................................... 29

6.12. # (empty directive)......................................................................................................................30

6.13. Operators................................................................................................................................... 30

6.13.1. Stringification (#)..........................................................................................................30

6.13.2. Concatenation (##)...................................................................................................... 31

6.14. Pre-defined Macros....................................................................................................................31

7. Expressions............................................................................................................. 33

7.1. Functions....................................................................................................................................33

7.2. Operands....................................................................................................................................33

7.3. Operators................................................................................................................................... 34

8. AVR Instruction Set..................................................................................................40

9. Revision History.......................................................................................................41

The Microchip Web Site................................................................................................ 42

Customer Change Notification Service..........................................................................42

Customer Support......................................................................................................... 42

Microchip Devices Code Protection Feature................................................................. 42

Legal Notice...................................................................................................................43

Trademarks................................................................................................................... 43

Quality Management System Certified by DNV.............................................................44

Worldwide Sales and Service........................................................................................45

AVR Assembler

Produktspecifikationer

Varumärke:	Microchip
Kategori:	Inte kategoriserad
Modell:	AT32UC3C0128C

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