The main MCU single-chip microcomputer zh251f is low-cost, high-performance, 8-bit, RISC architecture, and only 55 single word / single cycle instructions. The whole MCU is a dual clock system, with internal high-speed 20m and internal low-speed 32K clocks. The instruction cycle can be set to 4 times or 2 times the clock cycle through option. The performance of the device is much higher than that of similar products at the same price. The instruction set that is easy to use and easy to remember greatly shortens the development time.