A real time clock module maintains operating and timing parameters in "non-volatile" or persistent memory when an integrated circuit is powered down.

On terms that the fixed operating time remains invariant, the increase of the non-resorting train proportion will exert a positive influence on the carrying capacity of technical station.

This paper studies the interrupt latency and context-switch time of embedded real-time operating system, and about the interrupt latency a non-maskable interrupt idea is put forward.