Mikroelektronika MIKROE-742 데이터 시트

There are no Nested Calls Limitations, except by RAM size. A Nested call repre-
sents a function call to another function within the function body. With each function
call, the stack increases for the size of the returned address. Number of nested calls
is equel to the capacity of RAM which is left out after allocation of all variables. 

- There are many different types of derivates, so it is necessary to be familiar with 

characteristics and special features of the microcontroller in you are using. 

- Some of the AVR MCUs have hardware multiplier. Due to this, be sure to pay atten

tion when porting code from one MCU to another, because compiled code can vary 

by its size. 

- Not all microcontrollers share the same instruction set. It is advisable to carefully   

read the instruction set of the desired MCU, before you start writing your code.   

Compiler automatically takes care of appropiate instruction set, and if unapropriate 

asm instruction is used in in-line assembly, compiler will report an error. 

- Program counter size is MCU dependent. Thus, there are two sets of libraries : 

- MCUs with program counter size larger than 16 bits (flash memory size larger than  

128kb) 

- MCUs with program counter size less or equal 16 bits (flash memory size smaller 

than 128kb) 

- Assembly SPM instruction and its derivates must reside in Boot Loader section of 

program memory. 

- Part of flash memory can be dedicated to Boot Loader code. For details, refer to 

AVR memory organization. 

Related topics: mikroPascal PRO for AVR specifics, AVR memory organization

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- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 4