Imagecraft c compiler and development environment for the atmel avr

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ICCV8 for AVR – C Compiler for Atmel AVRC Machine RoutinesMost C operations are translated into direct Atmel AVR instructions. However, thereare some operations that are translated into subroutine calls because they involvemany machine instructions and would cause too much code bloat if the translationswere done inline. These routines are written in assembly language and can bedistinguished by the fact that the routine names do not start with an underscore orhave a two-underscore prefix. These routines may or may not use the standard callingconvention and you should not use them directly, as we may change their names orimplementations depending on the compiler releases.146
ICCV8 for AVR – C Compiler for Atmel AVRProgram and Data Memory UsageProgram MemoryThe program memory is used for storing your program code, constant tables, andinitial values for certain data such as strings and global variables. See Program Dataand Constant Memory. The compiler generates a memory image in the form of anoutput file that can be used by a suitable program such as an ISP (In SystemProgramming) Programmer.Internal SRAM-Only Data MemoryThe Data Memory is used for storing variables, the stack frames, and the heap fordynamic memory allocation. In general, they do not appear in the output file but areused when the program is running. A program uses data memory as follows:HWStackHigh AddressSWStackHeapGlobal Variablesand StringsCPU and I/ORegistersLow AddressThe bottom of the memory map is address 0. The first 96 (0x60) locations are CPUand IO registers. The newer ATMega devices have even greater amount of IOregisters. The compiler places global variables and strings from after the IO registers.147
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Imagecraft c compiler and development environment for the atmel avr

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