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Views Read Edit View history. It also found use in laser printers. It is the successor to the Motorola and is succeeded by the Motorola This page was last edited on 5 Septemberat It is further being used in the flight control and radar systems of the Eurofighter Typhoon combat aircraft. The 68EC lowered cost through a bit address bus. To avoid problems with returns from coprocessor, bus error, and address error exceptions, it was generally necessary in a multiprocessor system for all CPUs to be the same model, and for all FPUs to be the same model as well.

While the had ‘supervisor mode’, it did not meet the Popek and Goldberg virtualization requirements due to the single instruction ‘MOVE from SR’ being unprivileged but sensitive. The Nortel Networks DMS telephone central office switch also used the as the first microprocessor of the SuperNode computing core.


By using this site, you agree to the Terms of Use and Privacy Policy. Though it was not intended, these new modes made the very suitable for page printing; most laser printers in the early s had a 68EC at their core.


In a multiprocessor system, coprocessors could not be shared between CPUs. The resulting decrease in bus traffic was particularly important in systems relying heavily on DMA. The 68EC is a lower cost version of the Motorola The had no alignment restrictions on data access.

The had bit internal and external data and address buses, compared to the early x0 models with bit data and bit address buses. From Wikipedia, the free encyclopedia. Retrieved from ” https: The has a coprocessor interface supporting up to eight coprocessors.

The datasueet addressing modes added scaled indexing and another level of indirection to many of the pre-existing modes, and added quite a bit of flexibility to various indexing modes and operations. PGA pins used The coprocessor interface is asynchronous, so it is possible to run the coprocessors at a different clock rate than the CPU.

The Motorola ” sixty-eight-oh-twenty “, ” sixty-eight-oh-two-oh ” or ” six-eight-oh-two-oh ” is a bit microprocessor from Motorolareleased in The HP, and also use thetogether with a math coprocessor. Please dataxheet improve this article by adding citations to reliable sources. The previous and processors datashet only access word bit and long word bit data in memory if it were word-aligned located at an even address.

The replaced this with a proper instruction cache of bytes, the first 68k series processor to feature true on-chip cache memory. Though the had a “loop mode”, which sped loops through what was effectively a tiny instruction cache, it held only two short instructions and datasneet thus 6802 used.


The and had a proper three-stage pipeline. Wikimedia Commons has media related to Motorola Newer packaging methods allowed the ‘ to feature more external pins without the large size that the earlier dual in-line package method required. For more information on the instructions and architecture see Motorola In keeping with naming practices common to Motorola designs, the is usually referred to as the “”, pronounced “oh-two-oh” or “oh-twenty”.

Motorola 68020

This article needs additional citations for verification. Under the and later, this was made privileged, to better support virtualization software. Unsourced material may be challenged and removed. Multiprocessing support was implemented externally by the use of a RMC pin [1] to indicate an indivisible read-modify-write cycle in progress.

The UX shipped with Amiga Unix, requiring an ‘ or ‘ processor. The ‘s ALU was also natively bit, so could perform bit operations in one clock, whereas the took two clocks minimum due to its bit ALU.

The added many improvements over the including a bit arithmetic logic unit ALUbit external data and address buses, extra instructions and additional addressing modes.

Although small, it still made a significant difference in the performance of many applications. Fundamentals of Digital Logic and Microcomputer Design.

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