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Rabbit 2000
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<p>The Rabbit 2000 is a high-performance <a href="/facts/8-bit/2CkhLNoH">8-bit</a> <a href="/facts/Microcontroller/MKrnAhnm">microcontroller</a> designed by <a href="/facts/Rabbit_Semiconductor/m1Bjaou5">Rabbit Semiconductor</a> for <a href="/facts/Embedded_system/a4muX1wU">embedded system</a> applications. Rabbit Semiconductor has been bought by <a href="/facts/Digi_International/Bz9PWY6o">Digi International</a>, which is since selling the Rabbit microcontrollers and hardware based on them. The instruction set is based on the original <a href="/facts/Z80/Jeqe2h55">Z80</a> <a href="/facts/Microprocessor/Fx9CaQht">microprocessor</a>, but with some additions of new <a href="/facts/Instruction_(computer_science)/8p8vwUeE">instructions</a> as well as deletions of some instructions. Among the Z80 instructions missing in the Rabbit, cpir is particularly notable, since it allows for much more efficient implementations of some often-used standard C functions such as <a href="/facts/Strlen/V0AYCYR2">strlen</a>(), strnlen() and memchr(). According to the Rabbit documentation, it executes its instructions 5 times faster than the original <a href="/facts/Z80/Jeqe2h55">Z80</a> <a href="/facts/Microprocessor/Fx9CaQht">microprocessor</a>, that is, similarly to the <a href="/facts/Zilog_eZ80/MmNCCFKN">Zilog eZ80</a>. </p><p>The Rabbit 3000 is a variant of the Rabbit 2000 with the same core, but more powerful integrated <a href="/facts/Peripheral/3lEBPE14">peripherals</a>. The Rabbit 3000A variant adds a small number of additional instructions for I/O and large integer arithmetic. The Rabbit 4000 again adds more integrated peripherals. The further derivatives, starting with the Rabbit 5000 have a substantially different architecture. </p><p>Most of the Rabbit microcontrollers come with built-in <a href="/facts/Flash_memory/Cn8JsStx">flash</a> memory and <a href="/facts/Static_random_access_memory/Pmyo4V5e">SRAM</a>. They also have <a href="/facts/Analog-to-digital_converter/8YYNsMFg">ADC</a> and <a href="/facts/Timers/ayv4L3D7">timers</a> built-in. </p>