STM32 MCUs Products

LSI in Backup Domain on STM32H735.

Datasheet and Reference Manual have contradictions about the LSI Power.Information from Datasheet:The RTC is functional in VBAT mode and in all low-power modes when it is clocked by theLSE. When clocked by the LSI, the RTC is not functional in VBAT m...

Hello ST Expert, I want to implement Energy Meter Data reading using ST Microcontroller RS232 port with DLMS Protocol. Could you support and guide us to Implement DLMS . Energy meter sending data in DLMS protocol on RS232 Port.

STM32F091 Flash status SFR timing question during erare

I'm working on a bootloader which needs to erase and program the Flash. The erase seems to be 'working' but I have a suspicion that I'm not waiting long enough for the 'Busy' bit to go active after setting the 'Start' bit. The reference manual says I...

STM32L476RG detached Nucleo drawing 4.9mA even in Stop 2 Mode

The SetupI'm working on a prototype for a battery powered application on the STM32L476. I seem to have the code working, i.e. I put the MCU in Stop 2 Mode and wake it up after a sleep interval using the RTC. I've detached the base part of the Nucleo ...

How to setup SDMMC with the HSI48 clock?

Hi, i'm trying to configure the SDMMC device to be driven by the HSI48 clock, here is my configuration at the moment. Previously, i had configured the SDMMC with the PLLSAI clock and it worked at certain frequencies (38KHz.etc) but i've read in the s...

Why external interrupt shows delay..

I am doing one project with STM32H743ZI.I am using the external interrupt and copy the signal and set the output as input.But is shows about 700us delay.I do not know the reason why its gives such a big delay.

I2C1 Interrupt Handler Never Called

I am using an STM32H753. I2C1 (for an EEPROM) and I2C3 (for a touchscreen) are set up in the same way. Interrupt priority 10 for both, 400kHz. I can transfer data via I2C3 using interrupts, but when I try the same with I2C1, the interrupt handler is ...