公开(公告)号：US10326453B2

公开(公告)日：2019-06-18

申请号：US15841225

申请日：2017-12-13

Applicant: NXP B.V.

Inventor： Thierry G. C. Walrant ,  Bernd Uwe Gerhard Elend ,  Andreas Bening

IPC: H03K23/00 ,  G06F21/57 ,  G11C16/34 ,  G06F21/71 ,  G06F9/445 ,  H03K21/40 ,  H04L29/06

Abstract: The present application relates to a system hosting a monotonic counter and a method of operating the system. The system comprises a non-volatile memory (110) for holding a save counter value and a volatile memory (120) for maintaining a current counter value. The system (100) is configured during a startup phase to retrieve the saved counter value of the monotonic counter from the non-volatile memory (110); to detect whether a previous shutdown of the system (100) was an uncontrolled shutdown; and to adjust the retrieved counter value in accordance with a step size (130) provided at the system (100) in case an previous uncontrolled shutdown is detected.