10.3.2.3 Reset and Ivt Regions

  reset     : ORIGIN = 0x0,      LENGTH = 0x4

The Reset region corresponds to an instruction or vector in program memory. The value stored here determines where the device should begin executing code upon power-up or after a hard reset.

  reset     : ORIGIN = 0x0,      LENGTH = 0x4
  ivt       : ORIGIN = 0x4,      LENGTH = 0x1FC

The ivt region corresponds to the interrupt vector table. Each entry represents a word of program memory, which contains a 24-bit address. The linker initializes the vector tables with appropriate data, according to standard naming conventions.

Regions reset and ivt comprise the low address portion of Flash memory that is not available for user programs.