The MC9RS08KA2 series is a 8-bit microcontroller from Freescale, which has a built-in flash memory, a simplified S08 instruction set with added high-performance instructions, supports short-type and small-type addressing modes, supports 63 bytes of RAM, has wait and stop modes, and can be awakened by real-time interrupts (RTI), KBI, and ACMP. The working frequency can reach up to 10MHz. It has COP reset and low voltage detection protection functions, supports KBI keyboard interrupt port and background debugging system, and comes in 6-pin DFN, 8-pin PDIP and 8-pin SOIC three types of packages.