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Jun 26, 2026 12:07 PM UTC
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STM32H753 FMC asserting WE before NE

Hello,
I am currently trying to leverage STM32H753 FMC feature to interface with legacy Motorola flexbus style peripheral.
I suspect the answer to my question is no but I could not find an explicit statement within documentation saying it is precluded hardware wise :
Is there a mode / configuration (down to the registers level) that could allow the write enable signal (WE) to be asserted before the chip select signal (NE) ?

Thanks

mƎALLEm
mƎALLEmBest answer
ST Technical Moderator
Jun 26, 2026 3:12 PM UTC

Hello ​@dufrespa and welcome to the ST community,

There is no FMC behavior than what was described in the RM433 section / 22 Flexible memory controller (FMC). Refer to figures showing the different access waveforms..

To give better visibility on the answered topics, please click "Best answer" on the reply which solved your issue or answered your question.

1 reply

mƎALLEm
mƎALLEmBest answer
ST Technical Moderator
Jun 26, 2026 3:12 PM UTC

Hello ​@dufrespa and welcome to the ST community,

There is no FMC behavior than what was described in the RM433 section / 22 Flexible memory controller (FMC). Refer to figures showing the different access waveforms..

To give better visibility on the answered topics, please click "Best answer" on the reply which solved your issue or answered your question.