A device includes a non-maskable interrupt (NMI) signal path, a processor, and a peripheral component. The peripheral component may comprise secret data, such as a secret key. The processor may perform a preconfigured NMI interrupt service routine (ISR), in response to detecting a preconfigured signal in the NMI signal path. Access to at least a part of the peripheral component may be enabled in response to detecting the preconfigured signal in the NMI signal path. Thus, the processor may be able to access the secret data, for example, when the processor is running the NMI ISR.