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Is the Reset Line Required to be pulled low when attempting a Mass Erase over SWD.

Question asked by Lee Jones on Jan 23, 2017
Latest reply on Jan 23, 2017 by Kerry Zhou

I am attempting to perform a Mass Erase operation on a secured MK20DX256VLH7. 

When not secured, the device Erases fine.

 

When secured, the "Flash Mass Erase Acknowledge" bit is never set. 

In some documentation "Production Flash Programming - Best Practices for Kinetis K- and L- Series MCUs", it suggest asserting the Reset pin, it also mentions, that should there not be a Reset pin connected, it can be done by setting the 'System Reset Request' bit in the MDM-AP register. However..... in the Data Sheet, its says this bit cannot be set while in secure mode......

 

Am I correct in assuming that to Mass Erase a Secured MK20DX256VLH7, I must hold this pin low?

Or is there another way?

 

Thanks

 

Lee

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