用cw_12新建项目时自带下列函数是什么意思啊 ，麻烦解释一下

#pragma CODE_SEG __NEAR_SEG NON_BANKED /* Interrupt section for this module. Placement will be in NON_BANKED area. */
interrupt void RTI_ISR(void) { /* simple RTI interrupt service routine */
  /* clear RTIF bit */
  CRGFLG = 0x80; 
}

#pragma CODE_SEG DEFAULT
static void RTIInit(void) {
  /* setup of the RTI interrupt frequency */
  /* adjusted to get 1 millisecond (1.024 ms) with 16 MHz oscillator */
  RTICTL = 0x1F; /* set RTI prescaler */
  CRGINT = 0x80; /* enable RTI interrupts */
}