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Do different chips e.g. Atmel and PIC have to be programmmed in different ways even when you are using the same prog.language? for example, if you ahve a C code written for a particular operation, can it be used to program both Atmel chips and PICs?
Generally speaking, the answer is no. For one thing, when programming a microcontroller, you have at least a certain amount of hardware-specific functions in your code, and since Atmels and PICs are different hardware, those parts wouldn't be compatible. You might be able to cross-compile certain general-purpose (non-hardware-specific) functions/sections of code, but trying to cross-compile an entire program would not work.
For that matter, even different compilers written for the SAME chip aren't entirely compatible - there are a whole bunch of C compilers for the PIC, and to transfer code between them you almost always have to do at least a little (sometimes a lot) of modification.
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