The HT66F13 is a medium-popularity product manufactured by Holmate Technology Corp. (Holtek). It is an 8-bit high-performance microcontroller with an embedded flash memory. The Win Source Part Number for this product is 276708-HT66F13. This microcontroller is ideal for use in various applications such as remote controllers, home appliances, and industrial control systems. It has a low-power consumption rate and a wide operating voltage range of 2.2V to 5.5V. The HT66F13 also has a built-in oscillator and a watchdog timer function.