Calling Protocol and Conventions

The native HC08 and the new HCS08 have unique calling protocols. For the HCS08, the H register loads and stores more easily when loaded and stored with the X register. Thus the HCS08 uses the H register for parameter passing and return values.

The topics covered here are as follows:

• HC08 Argument Passing
  
  
• HCS08 Argument Passing (used for the -Cs08 Option)
  
  
• HC08 Return Values
  
  
• HCS08 Return Values (used for the -Cs08 Option)
  
  
• Returning Large Objects
  
  
• Stack Frames
  
  
• Pragma TRAP_PROC
  
  
• Interrupt Vector Table Allocation
  
  
• Segmentation
  
  
• Optimizations
  
  
• Volatile Objects