19.6.2.2 Enabling, Disabling and Resetting
The EIC is enabled by writing a '1' the Enable bit in the Control register (CTRL.ENABLE). The EIC is disabled by writing CTRL.ENABLE to '0'.
The EIC is reset by setting the Software Reset bit in the Control register (CTRL.SWRST). All registers in the EIC will be reset to their initial state, and the EIC will be disabled.
Refer to the CTRL register description for details.