STM32 stop mode wake via usart

The stm32 MCU wakes up with the internal 8Mhz oscilator and it takes 
some time to switch on HSE.

Due to project-planning issues, does anyone know if it's possible to set 
a stm32 MCU in stop mode and force a wakeup via USART without loosing 
the first data byte(s) of the transmitted USART data?


see also: 
https://my.st.com/public/STe2ecommunities/mcu/Lists/ARM%20CortexM3%20STM32/Flat.aspx?RootFolder=%2Fpublic%2FSTe2ecommunities%2Fmcu%2FLists%2FARM%20CortexM3%20STM32%2Fwake%20up%20from%20stop%20mode%20on%20usart%20interrupt%20do%20I%20need%20to%20configure%20EXTI&FolderCTID=0x01200200770978C69A1141439FE559EB459D758000626BE2B829C32145B9EB5739142DC17E&currentviews=333