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The 68EC is a lower cost version of the Motorola November Learn how and when to remove this template message. PGA pins used This page was last edited on 5 Septemberat Wikimedia Commons has media related to Motorola From Wikipedia, the free encyclopedia.
The added many improvements over the including a bit arithmetic logic unit ALUbit external data and address buses, extra instructions and additional addressing modes. Unsourced material may be challenged and removed. Though the had darasheet “loop mode”, which sped loops through what was effectively a tiny instruction cache, it held only two short instructions and was thus little used.
Motorola-Freescale-NXP processors and microcontrollers. It also found use in laser printers. InRochester Electronics has re-established manufacturing capability for the microprocessor and it is still available today. The and had a proper three-stage pipeline. In keeping with naming practices common to Motorola designs, the is usually referred to as the “”, pronounced “oh-two-oh” or “oh-twenty”.
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. Although small, it still made a significant difference in the performance of many applications.
The coprocessor interface is asynchronous, so it is possible to run the coprocessors at a different clock rate than the CPU. In other projects Wikimedia Commons. This article needs additional citations for verification. 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 had bit internal and external data and address buses, compared to the early x0 models with bit data and bit address buses. Naturally, unaligned accesses were slower than aligned accesses because they required an extra memory access. Views Read Edit View history. 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. The had a small byte direct-mapped instruction cache, arranged as 64 four-byte entries.
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. The has a coprocessor interface supporting up to eight coprocessors.
A lower cost version was also made available, known as the 68EC Fixed branch prediction, branch-never-taken approach . All other processors had to hold off memory accesses until the cycle was complete. 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.
Retrieved from ” https: 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. It is also the processor used on board TGV trains to decode signalling information which is sent to the trains through the rails.
MC Datasheet(PDF) – Motorola, Inc
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 UX shipped with Amiga Unix, requiring an ‘ or ‘ processor. Fundamentals of Datasyeet Logic and Microcomputer Design. 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.