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Question about the mass erase feature

Question asked by ebommer on May 9, 2014
Latest reply on May 9, 2014 by Clive One
I have been reading the "PM0075" Programing manual STM32F10xxx Flash memory micro-controllers and I am trying to understand the mass erase feature.  In the manual it states:

"Bit 2 MER: Mass erase
Erase of all user pages chosen."

I don't understand how the user pages are selected.  I keep reading the descriptions for the different registers and I don't see any where to select such a feature.  The only possibility for page exclusion I see is setting the Write protection bits as a way to determine what pages are NOT to be erased.

Also does any one know the time difference between erasing a single page and doing a mass erase.  I have read a 1k block will take 20mSec but I have not found any description of a mass erase.

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