This part is a kind of semiconductor called STC89C52RC.

Function of this product has MCU.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

STC89Cxx series MCU STC89LExx series MCU Data Sheet CONTENTS Chapter 1 Introduction.4 1.1 Features. 4 1.2 Block diagram... 5 1.3 Pin Configurations . 6 1.4 Pin Descriptions.. 7 1.5 Pin Package Drawings. 8 Chapter 2 POWER MANAGENMENT, RESET. 11 2.1 Power Management [ ... ]

STC89C52RC PDF Datasheet Download