The M8051W is a high performance core that executes each machine cycle in two clock cycles, giving a clock-for-clock performance that is six times faster than the M8051 and M8052 cores. They remain, however, binary and memory cycle compatible with Intel MCS-51 devices.
The M8051W incorporates various extended features, such as extra data pointers, support of extra interrupts and interrupt priority levels, optional multiple clock domains for optimising power consumption and support for synchronous memory cells.