Rabbit 2000
The Rabbit 2000 is a high-performance 8-bit microcontroller designed by Rabbit Semiconductor expressly to power embedded system applications. Its extensive integrated feature set and glueless architecture facilitate rapid hardware design, and its C-friendly instruction set permits efficient development of complex applications for embedded systems. The instruction set is based on the original Z80 microprocessor, but with some additions of new instructions as well as deletions of the least used instructions. According to the Rabbit documentation, it executes its instructions 5 times faster than the original Z80 microprocessor, that is, similarly to the Zilog eZ80.
Most of the Rabbit microcontrollers come with built-in flash memory and SRAM. They also have ADC and timers built-in.