Maxim high-speed microcontrollers are 8051-compatible devices that provide improved performance and

power consumption compared to the original version. They retain instruction-set and object-code

compatibility with the 8051, yet perform the same operations in fewer clock cycles. Consequently, more

throughput is possible for the same crystal speed. As an alternative, the high-speed microcontroller’s

more efficient design allows a much slower crystal speed to get the same results as an original 8051,

using much less power.