STM32F100R4T6B by STMicroelectronics Design and production,in Hong Kong QX Electronics Limited Spot sales,And can pass Hong Kong QX Electronics Limited Purchasing。STM32F100R4T6B Price reference $ 3.340000。STM32F100R4T6B - 。You can download Chinese information、Pin map、DatasheetData sheet function specification,In the information STM32F100R4T6B Detailed pin diagram and function application circuit diagram voltage and usage method and tutorial