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Values of the bits VOS[1:0] for ranges 1,2 and 3

Question asked by Wassim Ben Chikha on Oct 10, 2017
Latest reply on Oct 13, 2017 by Wassim Ben Chikha

Hello,

I use the STM32L152RE device with STM32Cube_FW_L1_V1.8.0

Please,  can you verify if there is problem in defining the values of the bits  VOS[1:0], which are defined in the manual of STM32L100xx, STM32L151xx,  STM32L152xx and STM32L162xx advanced ARM ® -based 32-bit MCUs (RM0038  Reference manual) as follows:
- 00: forbidden (bits are unchanged and keep the previous value, no voltage scaling range changed);
- 01: 1.8 V (range 1);
- 10: 1.5 V (range 2);
- 11: 1.2 V (range 3).
In fact, when I tried to execute __HAL_PWR_VOLTAGESCALING_CONFIG function with PWR_REGULATOR_VOLTAGE_SCALE3 (VOS=11), the execution failed. After resetting to 00(VOS=00), the execution succeed. Please, can you verify if the values of VOS should be definedas follows:
- 00: 1.8 V (range 1);
- 01: 1.5 V (range 2);
- 10: 1.2 V (range 3);
- 11: forbidden (bits are unchanged and keep the previous value, no voltage scaling range changed).

As shown in the following print screen, I added other printf after the next instructions. But, the message before __HAL_PWR_VOLTAGESCALING_CONFIG function appears, while other messages does not appear. It means that all instructions before this function are executed, while this function stops the execution of the next instructions.


Many thanks for your time and look forward for your response.
Kind regards,
Wassim Ben Chikha

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