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AlexLATH · 2021-03-07

Hi, I would like to use StandbyMode + RTC + Sram2a (backup).From the STM32WB55RG datasheet, the Sram2a can be retained after reset from standby mode. "Standby mode with SRAM2a retention when bit RRS is set in the PWR controlregister 3 (PWR_CR3). In t...

AlexLATH · 2021-11-04

Hello lizardboy, Indeed, enable SRAM retention wasn't enough. You also need to check SRAM RESET flag in option bytes. From P90 of RM0434 Reference manual Bit 25 SRAM2_RST: SRAM2 and PKA RAM erase when system reset 0: SRAM2 and PKA RAM erased when a...

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STM32WB55 - SRAM2a not retained after reset from standby mode

Re: STM32WB55 - SRAM2a not retained after reset from standby mode