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When is SR[STF] flag set in DryIce in K81 MCU?

Question asked by Stefko Urumov on Oct 25, 2018
Latest reply on Oct 29, 2018 by Fang Li

K81 MCU in DryIce has a SR(Status Register).

SR Bit 7 (Security Tamper Flag) is set "when the (optional) security module asserts its tamper detect" according to the K81 User Manual.

Further:

"The SR[STF] bitfield description refers to an "(optional) security module". The 2KB
secure SRAM is the security module integrated into this device."

and according to a note in the UM: "A system reset causes STF to be set because the secure SRAM
detects a system reset as a tamper event."

 

Could anybody explain about the circumstances this flag is really set.

 

So far I've been working with K81 and monitoring various tamper flags but never managed to create a condition that would set STF.

Is it really active and linked to secure SRAM in the K81 MCUs ?

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