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programming STM32F4xx supplied by 2.5V

Question asked by bayarn on May 22, 2013
Latest reply on May 22, 2013 by fm

I'm new in this forum and I'm not an english-speaker, so, sorry for some orthography mistakes.

I'am currently on a developpement of an electronic board that embeds a STM32F4xx and is supplied by 2.5V coming form a 3.7V Li-Polymer batterie with back-end 2.5V regulator. This MCU is programmed on the JTAG connector connected to the J-Link programmer.

My questions are : 
     - Can we program the MCU with this voltage level knowing that the STM32F4xx datasheet notice that the flash programming bit numbers depends on the supply voltage level of the MCU : 2.7V-3.6V for 32 bits, 2.1V-3.6V for 16 bits and 1.8V-3.6V for 8 bits.
     - So, I don't know exacticly how can we do to change the number of the bits. I thought that the CPU communicates automatically, with the suitable bits number, with the internal flash memory but I maybe make a mistake.

Then, I need your help before I make the PCB of my application.

Thanks all.