Difference between Macro and Function
* The codes for a function compiled once only
* On calling that function, the processor has to save the context, and on return restore the

context.

* Macros are used for short codes only.

* When a function call is used instead of macro, the overheads (context saving and return)
will take

a time, Toverheads that is the same order of magnitude asthe time, Texec for execution of

short codes within a function.

* Use the function when the Toverheads<
>Texec.

Use of Modifiers

‎auto‏ ا

‎ட unsigned

‎ட static

‎ட const

‎_ register

‎ட inlerrupl

‎_ extern

‎ட volatile

‎ட volatile stalic

‎Use of infinite loops

‎_ Infinite loops- Never desired in usual programming. Why? The program will never end and

‎never exit or proceed further to the codes after the loop.

‎_ Infinite loop is a feature in embedded system programming!

‎Use of Pointers

‎Pointers are powerful tools when used correctly and according to certain basic principles.

‎# define COM ((structsio near*) 0x2F8);

‎This statement with a single masterstroke assigns the addresses to all 8variables

‎Byte at the sio Addresses

‎0218: Byte at RBR/THR /DLATCH-LByte

‎0219: Byte at DLATCH-HByte