The BH66F5233 is a SOP-16_150mil RoHS package integrated circuit manufactured by Holtek. It is a 32 bit high performance microcontroller with a maximum external frequency of 72MHz. It features 1 MB Flash memory, additional 512KB Flash memory, and 64KB SRAM. It also includes an IEEE1149.1-compliant JTAG port for debugging and programming, as well as several I/O ports and peripheral functions, such as a 10-bit A/D converter, several timers, pulse width modulation (PWM) signals, USART, etc. The BH66F5233 also supports various I/O options, such as SPI, I2C, UART, and more. Additionally, the BH66F5233 is RoHS compliant, meaning that it does not contain hazardous materials such as lead, mercury, cadmium, hexavalent chromium, and other hazardous chemicals, making it safe for use in electronic applications.