http://www.st.com/web/en/catalog/mmc/FM141/SC1169?sc=stm32 http://www.st.com/web/en/catalog/mmc/FM141/SC1169?sc=stm32 has the list. http://www.st.com/web/catalo

http://www.st.com/web/en/catalog/mmc/FM141/SC1169?sc=stm32 http://www.st.com/web/en/catalog/mmc/FM141/SC1169?sc=stm32 has the list. http://www.st.com/web/catalog/mmc/FM141/SC1169/SS1577/LN1806/PF254219 http://www.st.com/web/catalog/mmc/FM141/SC1169/SS1577/LN1806... is one chip you could use, though frankly using that much processor for a keyboard firmware is hilariously overkill. (Not that there's any reason not to for a hobby project, really...)