SEMICONDUCTOR MEMORY DEVICE INCLUDING A SECURITY CONTROLLER CAPABLE OF IMPROVING THE STABILITY OF A DATA

摘要

PURPOSE: A semiconductor memory device including a security controller is provided to improve the stability of a data which is stored to an OTP(One Time Programmable) area.;CONSTITUTION: It is determined whether a data is changed by the state of lock/unlock when a program command is applied. An OTP control device prohibits the change of the lock state into an unlock state. The OTP apparatus comprises OTP registers(110,120,130) which stores data. The OTP apparatus comprises an OTP lock registers(140,150) which stores the releasing state of the OTP register.;COPYRIGHT KIPO 2011