The R8051 is a fast, small, single-chip, 8-bit microcontroller that executes all ASM51 instructions. It has the same instruction set as the 80C31, but its RISC-like design executes operations an average of 8 times faster. The R8051 provides software and hardware interrupts, a serial communications interface, two timers, and Intel peripherals support. On-chip debugging is an option. The microcode-free design was developed for easy reuse and is available optimized for several Lattice devices, with competitive utilization and performance characteristics. Scan insertion is also straightforward.