This part is a kind of semiconductor called HT66F03M.

Function of this product has 1.5V Battery Flash Type 8-Bit MCU.

Manufacturers : Holtek Semiconductor

Image and pinout :

Some of the text within the PDF file :

HT68F03M/HT68F04M/HT66F03M/HT66F04M 1.5V Battery Flash Type 8-Bit MCU with EEPROM & DC-DC Converter Features MCU Features · Operating voltage: 3.0V (typ.) · Power down and wake-up functions to reduce · EEPROM Memory: 64´8 · Watchdog Timer function · Up to 8 bidirectional I/O lines · External interrupt line shared with I/O pin · Multiple Timer Module for time measure, input power consumption · Five oscillators: - External High Speed Xtal - External 32.768kHz Xtal - External RC - Internal High Speed -- no ext. components - Internal 32kHz -- no ext. components · Multi-mode operation: NORMAL, SLOW, IDLE and capture, compare match output, PWM output or single pulse output functions · Comparator function · Dual Time-Base functions for generation of fixed time [ ... ]

HT66F03M PDF Datasheet Download