AT89S51-24PU by Microchip Design and production,in CHIPS-ORIGIN ELECTRONICS CO.,LIMITED Spot sales,And can pass CHIPS-ORIGIN ELECTRONICS CO.,LIMITED Purchasing。AT89S51-24PU Price reference $ 3.196000。AT89S51-24PU - 。You can download Chinese information、Pin map、DatasheetData sheet function specification,In the information AT89S51-24PU Detailed pin diagram and function application circuit diagram voltage and usage method and tutorial