带J的看起来是支持Java的特殊型号。只找到了说明，没找到具体手册，所以多半是小众产品。一般单独出的型号，多半会有不同，运行java环境的需要。 Running STM32Java programs, requires features that are embedded on special STM32 MCU series. There are two sets of special part numbers enabled for Java: MCU part numbers ending with the letter ‘J’ (for mass production) and MCU part numbers ending with the letter ‘U’ (can only be ordered as samples).
