Writing in flash- program code protection

Hello all,

In the example of the flash writing operation for F550x family we can find code below.

void main(void)
{
  unsigned long * Flash_ptrD;               // Initialize Flash pointer Seg D
  unsigned long value;
  WDTCTL = WDTPW+WDTHOLD;                   // Stop WDT

  Flash_ptrD = (unsigned long *) 0x1800;    // Initialize Flash pointer
  value = 0x12345678;                       // Initialize Value
  FCTL3 = FWKEY;                            // Clear Lock bit
  FCTL1 = FWKEY+ERASE;                      // Set Erase bit
  *Flash_ptrD = 0;                          // Dummy write to erase Flash seg
  FCTL1 = FWKEY+BLKWRT;                     // Enable long-word write
  *Flash_ptrD = value;                      // Write to Flash
  FCTL1 = FWKEY;                            // Clear WRT bit
  FCTL3 = FWKEY+LOCK;                       // Set LOCK bit
  while(1);                                 // Loop forever, SET BREAKPOINT HERE
}

Simple application.

There are two things I want to know.

1. Is compiler smart enough to don' t store program memory at 0x1800 address?

2. Is it recommended to use any range of addresses?

Best regards,

Mikolaj