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8051 Delivers RISC Performance with CISC Technology Building on a Legacy of Leadership Atmel has a long tradition of innovation in Flash microcontroller technology. We introduced the first 8-bit Flash microcontroller in 1993, based on the classic 8051 core. The on-chip Flash memory retained its contents even after power was turned off, and was electrically erasable and programmable. Atmel’s 8051 8-bit microcontrollers were the industry’s first Flash based microcontrollers featuring In-System Programming. Atmel also pioneered In-Application Programming in its Flash microcontrollers to enable remote upgrades. Single-Cycle AT89LP Family The Atmel AT89LP family is based on a low power, high performance 8-bit Single-Cycle 8051 core. The classic 8051 CPU requires 12 clock cycles for every byte fetch, while the new AT89LP CPU requires only one clock cycle. The AT89LP family instructions need only 1 to 4 clock cycles to complete, providing up to 12 times greater throughput than the classic 8051. Seventy percent of the instructions execute in the same number of clock cycles as the number of bytes to be fetched. The AT89LP core also delivers powerful performance, with up to 20 million instructions per second (MIPS) throughput at 20 MHz clock frequency—more than 10 times the throughput of the original 8051. Conversely, at the same MIPS throughput as the classic 8051, the new AT89LP core runs at a much lower clock frequency, greatly reducing power consumption. This efficient design lets AT89LP devices operate down to 2.0V supply voltage. The Single-Cycle AT89LP family of devices offer enhanced features accessible through instructions that are 100 percent binary compatible with the traditional 8051 instruction set. The Special Function Register (SFR) addresses and bit assignments are compatible with current Atmel 8051 microcontrollers. The AT89LP core also features several architectural improvements that make it an excellent fit for low power, high performance applications. Syst