About Cgelectronics

Cgelectronics · 2024-07-06

Hello STM Comunity, I am making this post because I have reviewed many reference schematics for the use of the STM32F103C8T6, and in most of them, I see that they use 20pF load capacitors for the LSE circuit.The datasheet literally states that the va...

Cgelectronics · 2023-10-15

Hello all,I'm working on a project with the STM32F103C8T6 microcontroller, using STMCubeIDE STM32CubeIDE Version: 1.13.2, and the HAL STM32Cube FW 1.8.5. In the example program I've attached, I set an alarm for 00:00:00, and once the alarm interrupt ...

Cgelectronics · 2023-09-23

Hello,In this thread, I would like to clarify a point regarding how to read the RTC_CLR[ALRF] flag. I am using the STM32F103C8T6 microcontroller and the STM32Cube Firmware (HAL) version 1.8.5. This flag indicates that the alarm has been activated.My ...

Cgelectronics · 2024-10-12

Hello @AScha.3 ,Point number 2 doesn't seem to be very aligned with the information that can be extracted from the microcontroller's datasheet or reference manual, although according to @STOne-32 explanation, using capacitors with a value of 15pF co...

Cgelectronics · 2024-10-12

Hi @STOne-32 , sorry for not responding all this time. I'm glad to know that I was on the right track and that my calculations are accurate. After reading your response, I have no doubts about it. It's great to have people with a background who have ...

Cgelectronics · 2024-03-30

Hello @Piranha, Thanks for your answer, I would like to complete my response since my comment does not sufficiently clarify the solution to this thread. Here is the necessary information:The ALRF bit is part of RTC_CR register, not ALR - this can be ...

Cgelectronics · 2023-10-20

Thank you, @TDK , for your response. I'm investigating what might be happening. The HAL_RTC_GetTime function modifies the alarm registers, and I will check what might be happening right at the point where both interrupts and the alarm are triggered, ...

Cgelectronics · 2023-10-20

I don't know if it is the same case for the STM32L071 as the STM32F103, but after many attempts and tests, I have opened a ticket with ST, and I've got this answer:"It turns out that the ALRF flag (and indeed the whole register) is not kept through s...

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STM32F103 LSE load capacitance calculations (RTC)

STM32F103x strange behavior using HAL_RTC_GetTime() together with RTC interrupts (ALR and SEC flags)

STM32F103 Multiple wakeup sources detection. Unable to read RTC_CRL[ALRF] flag after reset from STBY

Re: STM32F103 LSE load capacitance calculations (RTC)

Re: STM32F103 LSE load capacitance calculations (RTC)

Re: STM32F103 Multiple wakeup sources detection. Unable to read RTC_CRL[ALRF] flag after reset from

Re: STM32F103x strange behavior using HAL_RTC_GetTime() together with RTC interrupts (ALR and SEC fl

Re: [STM32L0] Wake up Flag for RTC does not rise when an alarm occurs