STM32F103R4T6 STM32F103R4T6A STM32F103R6H6A STM32F103R6H6BTR STM32F103R6T6 STM32F103R6T6A STM32F103R6T6ATR STM32F103R6T7A STM32F103R8 STM32F103R8H6