hi WE ARE USING STM32L152RET6.Is it have internal RTC?Why RTC_REFINRTC_TA RTC_OUT pins are used?
Kindly provide any rtc document for STM32L152RET6
RTC_REFIN is used to synchronize with an external reference clock
RTC_TA is a tamper input
RTC_OUT is an alarm output
you should definitely read the RTC section of RM0038 if you plan to use this device.
IS THERE ANY HARDWARE CIRCUIT
On Tue, Feb 28, 2017 at 12:51 PM, Max <firstname.lastname@example.org>
Review the EVAL and DISCOVERY series boards for the L1 series chips if you need to see viable schematics.
The device has an internal low speed oscillator (LSI), and can use a more precise external crystal (LSE) via the OSC_IN and OSC_OUT pins. There is an application note describing crystal/component selection.
Please learn to read and type in a coherent/professional manner, it will make communicating a lot easier.
Besides to Clive & Max proposals, I suggest you refer to AN3216: Getting started with STM32L1xxx hardware development.
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