Why I am getting FLASH->SR reset value is 0xC0

[Namir]

Hi

I am using STM32L476ZG MCU development board. I created a new project without adding any interrupts. I noticed that FLASH->SR = 0xC0 at reset and when I try to clear it, it comes back after the next command I execute.

I'll add screen shots to clarify what I am experiencing.

1- Just entered the code, no command executed yet

2- executed `FLASH->SR |= FLASH_FLAG_SR_ERRORS;`

3- executed `HAL_Init();`

4- executed `FLASH->SR |= FLASH_FLAG_SR_ERRORS;`

5- executed `SystemClock_Config();`

6- executed `FLASH->SR |= FLASH_FLAG_SR_ERRORS;`

7- executed `HAL_FLASH_Unlock();`

8- executed `FLASH->SR |= FLASH_FLAG_SR_ERRORS;`

9- executed `MX_GPIO_Init();`

You can see I failed to permanently clearing FLASH-SR

Thanks

-Namir

[KDJEM.1]

Hello @Namir  and welcome to the Community :),

Could you please try to connect your board using STM32CubeProgrammer.

Then, click on erase flash memory and check the status of Flash_SR register as shown in the below figures.

Also, could you please try this example STM32CubeL4/Projects/NUCLEO-L476RG/Examples/FLASH/FLASH_EraseProgram at master · STMicroelectronics/STM32CubeL4 · GitHub and check the FLASH->SR reset value.

I hope this help you to solve the issue.

Kaouthar