mspgcc: A port of the GNU tools to the Texas Instruments MSP430 microcontrollers
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Reserving space above the stack

Declaring the "main" routine in the form 

int RESERVE_RAM(10) main()
{
    ...
}
will reserve 10 bytes of memory, which resides at the top of RAM and will not be used by your C code. This is useful for things like PUC restarts, or data which should persist across resets.

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Accessing the MSP430's peripheral registers - the SFRsUpHandling the status register