The HC89S105K8T6 is a 32-pin low-power 8-bit microcontroller from Holychip. It is RoHS compliant, making it environmentally friendly. The device operates at a maximum clock speed of 25MHz and features a variety of peripherals, including four 8-bit I/O ports (one of which can be used for external memory interfacing), two 16-bit timers, SPI, UART, ADC, and up to 8 KB of Flash memory. It is housed in a LQFP-32 package, making it space-efficient, and also supports up to 8 KB of on-chip data EEPROM. Additionally, it has an internal temperature-sensor-based system security timer, allowing for secure access to on-chip flash memory and data retention across power cycles. Overall, the HC89S105K8T6 is a low-power yet powerful 8-bit microcontroller perfect for a variety of applications.