STM32L471 is not programmable after it put into Standby mode

[123456]

Posted on August 10, 2017 at 11:12

Hi Everyone,

I put my MCU into standby mode and now I cannot program/erase it using Segger J-flash.

I'm not sure its releated to the standby mode but it's the 3rd board it happens on.

Erasing option bytes wasn't successful too.

If anyone knows a solution it would be much appreciated.

Thanks

[Tilen MAJERLE]

Posted on August 10, 2017 at 11:17

Hello

a.giladgili

‌,

when device is in low-power mode, you need to connect to device using Connect under reset option in ST-Link Utility software.

Of course, RST pin of ST-Link must be connected to nRST of STM32 device, otherwise this connection mode is not possible.

You can also wake up device before programming. In this case you don't need under reset mode if your SWD pins are at default states.

Best regards,

Tilen