Info Catalog as: AVR-Regs as: AVR Syntax

as: AVR-Modifiers

 
 9.5.2.3 Relocatable Expression Modifiers
 ........................................
 
 The assembler supports several modifiers when using relocatable
 addresses in AVR instruction operands.  The general syntax is the
 following:
 
      modifier(relocatable-expression)
 
 'lo8'
 
      This modifier allows you to use bits 0 through 7 of an address
      expression as 8 bit relocatable expression.
 
 'hi8'
 
      This modifier allows you to use bits 7 through 15 of an address
      expression as 8 bit relocatable expression.  This is useful with,
      for example, the AVR 'ldi' instruction and 'lo8' modifier.
 
      For example
 
           ldi r26, lo8(sym+10)
           ldi r27, hi8(sym+10)
 
 'hh8'
 
      This modifier allows you to use bits 16 through 23 of an address
      expression as 8 bit relocatable expression.  Also, can be useful
      for loading 32 bit constants.
 
 'hlo8'
 
      Synonym of 'hh8'.
 
 'hhi8'
 
      This modifier allows you to use bits 24 through 31 of an expression
      as 8 bit expression.  This is useful with, for example, the AVR
      'ldi' instruction and 'lo8', 'hi8', 'hlo8', 'hhi8', modifier.
 
      For example
 
           ldi r26, lo8(285774925)
           ldi r27, hi8(285774925)
           ldi r28, hlo8(285774925)
           ldi r29, hhi8(285774925)
           ; r29,r28,r27,r26 = 285774925
 
 'pm_lo8'
 
      This modifier allows you to use bits 0 through 7 of an address
      expression as 8 bit relocatable expression.  This modifier useful
      for addressing data or code from Flash/Program memory.  The using
      of 'pm_lo8' similar to 'lo8'.
 
 'pm_hi8'
 
      This modifier allows you to use bits 8 through 15 of an address
      expression as 8 bit relocatable expression.  This modifier useful
      for addressing data or code from Flash/Program memory.
 
 'pm_hh8'
 
      This modifier allows you to use bits 15 through 23 of an address
      expression as 8 bit relocatable expression.  This modifier useful
      for addressing data or code from Flash/Program memory.
 

Info Catalog as: AVR-Regs as: AVR Syntax