The maximum clock frequency of the STM32F051K8T6TR is 48 MHz.
The STM32F051K8T6TR has 64 KB of flash memory.
Yes, the STM32F051K8T6TR can operate in the industrial temperature range of -40°C to 85°C.
No, the STM32F051K8T6TR does not have a built-in USB interface. However, it has a USB device peripheral that can be used to implement a USB interface with an external transceiver.
The STM32F051K8T6TR has two UARTs (USART1 and USART2).