LYCOS RETRIEVER 
Motorola 68000
built 514 days ago
Motorola 68000 (MC68000) is the first member of 680x0 line of microprocessors. Internally the 68000 is a 32-bit microprocessor - it has 32-bit data and address registers. Externally the processor has 16-bit data bus and 24-bit address bus, which limits the size of addressable memory to 16 MB. Motorola ... made 68008 - a version of 68000 CPU with 8-bit external data bus. In addition to basic HMOS 68000 and 68008 processors the following modifications were produced:
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The Motorola 68000 is a CISC microprocessor , the first member of a successful family of microprocessors from Motorola , which were all mostly software compatible. The entire series was often referred to as the m68k , or simply 68k .
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The Motorola 68000 simulator included in the BSVC distribution simulates the 68000 at the software level. This means the simulator does not understand what goes on in the 68000 at the hardware level. Instead the simulator performs a set of actions for each instruction that gives the same result.
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Apparu en 1979, le Motorola 68000 est un microprocesseur CISC 16/32 bits développé par Motorola. C'est le premier de la famille de microprocesseurs souvent appelée m68k ou 680x0, qui comprend notamment les microprocesseurs Motorola 68010, Motorola 68020, Motorola 68030, Motorola 68040 et Motorola 68060. Le nom du 68000 vient à la fois de la continuité avec la famille de microprocesseurs Motorola 6800 et du nombre de transistors qu'il contient, un peu plus de 68 000.
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This Motorola 68000 series compiler target is intended for illustration and demonstration purposes only. Archelon's retargetable tools are intended for unique microprocessors and DSPs where other software tools are either not effective or not available.
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The 68HC000, the CMOS version of the 68000, was designed by Hitachi and jointly introduced in 1985.[2] Motorola's version was called the MC68HC000, while Hitachi's was the HD68HC000. The 68HC000 was eventually offered at speeds from 8 MHz to 20 MHz. Except for using CMOS circuitry, it behaved identically to the HMOS MC68000, but the change to CMOS greatly reduced its power consumption. The original HMOS MC68000 consumed around 1.35 watts at an ambient temperature of 25 °C, regardless of clock speed, while the MC68HC000 consumed only 0.13 watts at 8 MHz and 0.38 watts at 20 MHz. (Unlike CMOS circuits, HMOS still draws power when idle, so power consumption varies little with clock rate.) Motorola replaced the MC68008 with the MC68HC001 in 1990.[3] This chip resembled the 68HC000 in most respects, but its data bus could operate in either 16-bit or 8-bit mode, depending on the value of an input pin at reset. Thus, like the 68008, it could be used in systems with cheaper 8-bit memories.
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Motorola 68000