![]() So if a stable and accurate time measurements (especially in longer periods) are needed - it is definitelly worth using an external cristall oscillator as a reference clock for the RTC. Internal 32kHz reference has a wide tolerance and changes with temperature (as presented in the STM32F405xx / STM32F407xx Datasheet): The only issue is an additional VBAT voltage that is used as a backup supply for the RTC (as well as for additional backup registers and a small amout of backup SRAM memory). External 32.768 kHz clock reference is (by default) not fitted on the STM32F4-Discovery boards, but footprint of the crystal oscillator and load capacitors is provided on the PCB. It is easy to use and can be driven by an internal or external 32,768 kHz reference clock. ![]() ![]() STM32F4xx have a build in RTC (Real Time Clock) module. Odsłony: 102427 STM32F4-Discovery RTC Hack
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