This part is a kind of semiconductor called 89S52.

Function of this product has AT89S52.

Manufacturers : ATMEL Corporation

Image and pinout :

Some of the text within the PDF file :

Features • Compatible with MCS-51® Products • 8K Bytes of In-System Programmable (ISP) Flash Memory • • • • • • • • • • • • • – Endurance: 1000 Write/Erase Cycles 4.0V to 5.5V Operating Range Fully Static Operation: 0 Hz to 33 MHz Three-level Program Memory Lock 256 x 8-bit Internal RAM 32 Programmable I/O Lines Three 16-bit Timer/Counters Eight Interrupt Sources Full Duplex UART Serial Channel Low-power Idle and Power-down Modes Interrupt Recovery from Power-down Mode Watchdog Timer Dual Data Pointer Power-off Flag Description The AT89S52 is a low-power, high-performance CMOS 8-bit microcontroller with 8K bytes of in-system programmable Flash memory. The device is manufactured using Atmel’s high-density nonvolatile memory technology [ ... ]

89S52 PDF Datasheet Download