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CHead
Associate III
November 1, 2018
Question

STM32H7 AXI bus clock stopped in CSleep?

  • November 1, 2018
  • 0 replies
  • 457 views

According to RM0433 revision 5 section 7.5.12, “The AXI bridge clock is enabled when the CPU is in CRun mode.�? Does this mean that the AXI bridge clock is disabled (and presumably things connected to the AXI, like the MDMA) do not work in CSleep? This seems unexpected, since I would expect CSleep to affect only the CPU, not any peripherals.

Experimentation suggests that this is not the case: an MDMA transfer from AXI SRAM to AXI SRAM seems to continue and complete without any difficulty after a WFI instruction (which would put the CPU in CSleep). However, official clarification would be appreciated.

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