RESET PIN cause a HardFault_Handler

[MR.liu]

When I operate RESET PIN in main function like this:NRF_POWER->RESET = 1,Then cause a HardFault_Handler,(/attachment/fabd1141d36157d32f8c0353e4880b3e),What's this？

[MR.liu]

my SoftDevice is s110_nrf51_8.0.0_softdevice,i want enable reset pin without power down,so i did like this