AVR Assembler

Preface
1 AVR Assembler Known Issues
2 AVR Assembler Command Line Options
3 Assembler Source
4 AVR Assembler Syntax
5 Assembler Directives
- 5.1 BYTE
  Reserves bytes for a variable.
- 5.2 CSEG
  Code segment.
- 5.3 CSEGSIZE
  Program Memory Size.
- 5.4 DB
  Define constant byte(s) in program memory and EEPROM.
- 5.5 DD
  Define constant double-word(s) in program memory and EEPROM.
- 5.6 DEF
  Set a symbolic name on a register.
- 5.7 DQ
  Define constant quad-word(s) in program memory and EEPROM.
- 5.8 DSEG
  Data Segment.
- 5.9 DW
  Define constant word(s) in program memory and EEPROM.
- 5.10 ELIF and ELSE
  Conditional assembly.
- 5.11 ENDIF
  Conditional assembly.
- 5.12 ENDM and ENDMACRO
  End macro.
- 5.13 EQU
  Set a symbol equal to an expression.
- 5.14 ERROR
  Outputs an error message string.
- 5.15 ESEG
  EEPROM Segment.
- 5.16 EXIT
  Exit this file.
- 5.17 IF, IFDEF, and IFNDEF
  Conditional assembly.
- 5.18 INCLUDE
  Include another file.
- 5.19 LIST
  Turn the listfile generation on.
- 5.20 LISTMAC
  Turn macro expansion on.
- 5.21 MACRO
  Begin macro.
- 5.22 MESSAGE
  Output a message string.
- 5.23 NOLIST
  Turn listfile generation OFF.
- 5.24 ORG
  Set program origin.
- 5.25 OVERLAP and NOOVERLAP
  Set up overlapping section.
- 5.26 SET
  Set a symbol equal to an expression.
- 5.27 UNDEF
  Undefine a register symbolic name.
- 5.28 WARNING
  Outputs a warning message string.
6 Preprocessor
7 Expressions
The Assembler incorporates constant expressions.
8 AVR Instruction Set
9 Revision History
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5.15 ESEG

EEPROM Segment.

The ESEG directive defines the start of an EEPROM segment. An assembler source file can consist of several EEPROM segments, which are concatenated into a single EEPROM segment when assembled. An EEPROM segment will normally consist of DB and DW directives (and labels) only. The EEPROM segments have their own location counter, which is a byte counter. The ORG directive can be used to place the variables at specific locations in the EEPROM. The directive does not take any parameters.

Syntax

.ESEG

Example

.DSEG ; Start data segment 
var1: .BYTE 1 ; reserve 1 byte to var1 
table: .BYTE tab_size ; reserve tab_size bytes.

.ESEG 
eevar1: .DW 0xffff ; initialize 1 word in EEPROM

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