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The 68EC lowered cost through a bit address bus. The had a small byte direct-mapped instruction cache, arranged as 64 four-byte entries.

Motorola 68020

From Wikipedia, the free encyclopedia. The had no alignment restrictions on data access. Newer packaging methods allowed the ‘ to feature more external pins without the large size that the earlier dual in-line package method required. The and had a proper three-stage pipeline.

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. Motorola-Freescale-NXP processors and microcontrollers.

Under the and later, this datashheet made privileged, to better support virtualization software.

The has a coprocessor interface supporting up to eight coprocessors. 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. Wikimedia Commons has media related to Motorola It is also the processor used on board TGV trains to decode signalling information which is sent to the trains through the rails.

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. November Learn how and when to remove this template message. The 68EC darasheet a lower cost version of the Motorola Unsourced material may be challenged and removed.


Motorola – Wikipedia

Naturally, unaligned accesses were slower than aligned accesses because they required an extra memory access. 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. The added many improvements over the including a bit arithmetic logic unit ALUbit external data and address buses, extra instructions and additional addressing modes. It is further being used in the flight control and radar systems of the Eurofighter Typhoon combat aircraft.

Fundamentals of Digital Logic and Microcomputer Design. The UX shipped with Amiga Unix, requiring an ‘ or ‘ processor. Fixed branch prediction, branch-never-taken approach [15]. 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 had bit internal and external data and address buses, compared to the early x0 models with bit data and bit address buses.

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.

It also found use in laser printers. 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. Multiprocessing support was implemented externally by the use of a RMC pin [1] to indicate an indivisible read-modify-write cycle in progress.

For more information on the instructions and architecture see Motorola All other processors had to hold off memory accesses until the cycle was complete. A lower cost version was also made available, known as the 68EC PGA pins used The HP, and also use thetogether with a math coprocessor. In a multiprocessor system, coprocessors could not be shared between CPUs.


Please help improve this article by adding citations to reliable sources. InRochester Electronics has re-established manufacturing capability for the microprocessor and it is still available today.

The main CPU recognizes “F-line” instructions with the four most significant opcode bits all oneand uses special bus cycles to interact with a coprocessor to execute these instructions. By using this site, you agree to the Terms of Use and Privacy Policy.

The coprocessor interface is asynchronous, so it is possible to run the coprocessors at a different clock rate than the CPU. Views Read Edit View history.

In other projects Wikimedia Commons. Although small, it still made a significant difference in the performance of many applications.


The replaced this with a proper instruction cache of bytes, the first 68k series processor to feature true on-chip cache memory. This page was last edited on 5 Septemberat Retrieved from ” https: The previous and processors could only access word bit and long word bit data in memory if it were word-aligned located at an even address.

The resulting decrease in bus traffic was particularly important in systems relying heavily on DMA.