14.3.6.4 Interrupt Handling
Interrupt IRQ_4 (CCA_ED_DONE) is issued at the end of a manually initiated CCA measurement.
Note: A CCA request should only be initiated in Basic Operating Mode receive states.
Otherwise the radio transceiver generates an IRQ_4 (CCA_ED_DONE) and sets the register
bit CCA_DONE = 1, even though no CCA measurement was performed.