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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.

User Guide

DS40001917A-page 1

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

User Guide

DS40001917A-page 2