P87C52 by INT Design and production,in INSO(INCREDIBLE SOLUTION) Spot sales,And can pass INSO(INCREDIBLE SOLUTION) Purchasing。P87C52 Price reference $ 0。P87C52 - 。You can download Chinese information、Pin map、DatasheetData sheet function specification,In the information P87C52 Detailed pin diagram and function application circuit diagram voltage and usage method and tutorial