Imagecraft c compiler and development environment for the atmel avr

ICCV8 for AVR – C Compiler for Atmel AVROn top of the variables is the area where you can allocate dynamic memory. SeeStandard Library And Memory Allocation Functions. At the high address, the hardwarestack starts at the end of the SRAM. Below that is the software stack which growsdownward. It is up to you, the programmer, to ensure that the hardware stack does notgrow past the software stack, and the software stack does not grow into the heap.Otherwise, unexpected behaviors will result (oops...). See Program Data andConstant Memory.External SRAM Data MemoryIf you select a device target with 32K or 64K of external SRAM, then the stacks areplaced at the top of the internal SRAM and grow downward toward the low memoryaddresses. The data memory starts on top of the hardware stack and grows upward.The allocations are done differently because the internal SRAM has faster accesstime than external SRAM and in most cases, it is more beneficial to allocate stackitems to the faster memory.Upper 32K External SRAM Data MemoryIn the rare occasions that you have 32K external SRAM but it is at the upper 32Kaddress space, you can use it by selecting “Internal SRAM Only” in the Build Options -Target page, and then add -bdata:0x8000.0xFFFF in the “Other Options” edit box.Stacks will be allocated to the internal SRAM for speed and global data will beallocated to the external SRAM.148