11.1.2.3 Stack Overflow and Underflow Resets
Device Resets on Stack Overflow and Stack Underflow conditions are enabled by setting the STVREN Configuration bit in Configuration. When STVREN is set, a Full or Underflow condition will set the respective STKOVF or STKUNF bit and then cause a device Reset. When STVREN is cleared, a Full or Underflow condition will set the respective STKOVF or STKUNF bit but not cause a device Reset. The STKOVF or STKUNF bits are cleared by the user software or a Power-on Reset.