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SYS_WKUP PA0 pin on STM32F103RBT6 Nucleo under CubeMX and Keil

Question asked by john.john.002 on Jul 21, 2016
Latest reply on Jul 22, 2016 by john.john.002
I am using above hardware, HAL STM32CubeMX and Keil.

In datasheet DocID13587 Rev 17 page 29 and also CubeMX, pin 17 PA0 is specially marked as SYS-WKUP.

What is special about this pin?  What can it do 'specially' while many other pins can be configured to wake up in many different manner? 

I searched info on web and manuals but no success yet. Pointer to info on how to configure in various 'sleep/standby/stop modes' is appreciated. 

The application is battery device. Wake up to work for, says 1ms,  then sleep with low uA, until next scheduled wake up or 'interrupt' on external pin (user keypad)