When using a 16-bit device, an unexpected Reset occurred. How do I determine what caused it?

Some things to consider:

• To determine a Reset source, check the RCON register.
• Handle traps/interrupts in an Interrupt Service Routine (ISR). You should include trap.c style code, i.e.,

  Copyvoid __attribute__((__interrupt__)) _OscillatorFail(void);
          :
  void __attribute__((__interrupt__)) _AltOscillatorFail(void);
          :
  void __attribute__((__interrupt__)) _OscillatorFail(void)
      {
          INTCON1bits.OSCFAIL = 0;        //Clear the trap flag
          while (1);
      }
          :
      void __attribute__((__interrupt__)) _AltOscillatorFail(void)
      {
          INTCON1bits.OSCFAIL = 0;
          while (1);
      }
      :

• Use ASSERTs. For example:

  CopyASSERT
        (IPL==7)