RTCC battery backup w/sleep

#define Idle() {__asm__ volatile (pwrsav #1);}

Idle();  //enter idle mode

int main(void)
 {
    while (1)
    {
        if (PORBbits.RB7 == 0)      // Assume this indicates "No AC"
        {
            /* You may need to set your I/O pins to proper state to reduce current */
             PMD1 = 0xFFFF;
             PMD2 = 0xFFFF;
             PMD3 = 0xFDFF;         // RTCC alive
             _IDLE = 1;
              IDLE();
              if (_IDLE == 0)             // To verify that the processor indeed went to idle
               LATAbits.LATA8  ^= 1; // toggle RA8 after waking up
         }
         
     }
 }