The DS80C400 is a fast 8051-compatible microcontroller that executes instructions up to three times faster than an original 8051 at the same crystal speed. Its maximum system-clock frequency of 75MHz results in a minimum instruction cycle time of 54ns. Access to large program or data memory areas is simplified with a 24-bit addressing scheme that supports up to 16MB of flat memory. To accelerate data transfers between the microcontroller and the 16MB memory map, the DS80C400 provides four data pointers, each of which can be configured to automatically increment or decrement upon execution of certain data pointer-related instructions. The mircocontroller's hardware math accelerator further increases the speed of 32-bit and 16-bit multiply and divide operations as well as high-speed shift, normalization, and accumulate functions.