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It is the successor to the Motorola and is succeeded by the Motorola In daasheet, Rochester Electronics has re-established manufacturing capability for the microprocessor and it is still available today.

This article is based on material taken from the Free On-line Dictionary of Computing prior to 1 November and incorporated under the “relicensing” terms of the GFDLversion 1. By using this site, you agree to the Terms of Use and Privacy Policy. It 668020 found use in laser printers. Newer packaging methods allowed the ‘ to feature more external pins without the large size that the earlier dual in-line package method required.

Motorola 68020

Naturally, unaligned accesses datasgeet slower than aligned accesses because they required an extra memory access. Motorola-Freescale-NXP processors 680220 microcontrollers. From Wikipedia, the free encyclopedia.

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. Unsourced material may be challenged and removed.

November Learn how and when to remove this template message. The replaced this with a proper instruction cache of bytes, the first 68k series processor to feature true on-chip cache memory. The 68EC lowered cost through a bit address bus. 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. All other processors had to hold off memory accesses until the cycle was complete.


The has a coprocessor interface supporting up to eight coprocessors. A lower cost version was also made available, known as the 68EC In other projects Wikimedia Commons. In a multiprocessor system, coprocessors could not be shared between CPUs. The had a small byte direct-mapped instruction cache, arranged as 64 four-byte entries.

The coprocessor interface is asynchronous, so it is possible to run the coprocessors at a different clock rate than the CPU. Wikimedia Commons has media related to Motorola To avoid problems with datsaheet 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. The had no alignment restrictions on data access.

The UX shipped with Amiga Unix, requiring an ‘ or ‘ processor. In keeping with naming practices common to Motorola designs, the is usually referred to as the “”, pronounced “oh-two-oh” or “oh-twenty”. The HP, and also use thetogether with a math coprocessor. The Nortel Networks DMS telephone central office switch also used the as the first microprocessor of the SuperNode computing core.

The new 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. The 68EC is a lower cost version of the Motorola Fundamentals of Digital Logic and Microcomputer Design. PGA pins used Views Read Edit View history. Retrieved from ” https: The and had a proper three-stage pipeline.

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Please 688020 improve this article by adding citations to reliable sources. Although small, it still made a significant difference in the performance of many applications. Fixed branch prediction, branch-never-taken approach [15]. It is further being used in the flight control and radar systems of the Eurofighter Typhoon combat aircraft.

Motorola – Wikipedia

Though the had a “loop mode”, which sped loops through what was effectively a tiny instruction cache, it held only two short instructions and was thus little used.

The added many improvements over the including a bit arithmetic datashedt unit ALUbit external data and address buses, extra instructions and additional addressing modes. Under the and later, this was made privileged, to better support virtualization software. This page was last edited on 5 Septemberat For more information on the instructions and architecture see Motorola This article needs additional citations for verification.

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 Motorola ” sixty-eight-oh-twenty “, ” sixty-eight-oh-two-oh ” or ” six-eight-oh-two-oh ” is a bit microprocessor from Motorolareleased in