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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. Fixed branch prediction, branch-never-taken approach [15].

The resulting decrease in bus traffic was particularly important in systems relying heavily on DMA. 6800 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. November Learn how and when to remove this template message. Although small, it still made a significant difference in the performance of many applications.

The added many improvements over the including a bit arithmetic logic unit ALUbit external data and address buses, extra instructions and additional addressing modes. The and had a proper three-stage pipeline. A lower cost version was also made available, known as the 68EC The coprocessor interface is asynchronous, so it is possible to run the coprocessors at a different clock rate than the CPU.


Motorola-Freescale-NXP processors and microcontrollers. Multiprocessing support was implemented externally by the use of a RMC pin [1] to indicate an indivisible read-modify-write cycle in progress. Datasyeet 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 Nortel Networks DMS telephone central office switch also used the as the first microprocessor of the SuperNode computing core. 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.

Newer packaging methods allowed the ‘ to feature more external pins without the large size that the earlier dual in-line package method required.

Datashwet other projects Wikimedia Commons.

MC Datasheet(PDF) – Motorola, Inc

Retrieved from ” https: It is the successor to the Motorola and is succeeded by the Motorola This page was last edited on 5 Septemberat In keeping with naming practices common to Motorola designs, the is usually referred to as the “”, pronounced “oh-two-oh” or “oh-twenty”. In a multiprocessor system, coprocessors could not be shared between CPUs. This article needs additional citations for verification. The had bit internal and external data and address buses, compared to the early x0 models with bit data and bit address buses.

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.


Motorola 68020

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. Wikimedia Commons has media related to Motorola Under the and later, this was made privileged, to better support virtualization software. 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.

InRochester Electronics has re-established manufacturing capability for the microprocessor and it is still available dataeheet.

Motorola – Wikipedia

The replaced this with a proper instruction cache of bytes, the first 68k series processor to feature true on-chip cache memory. Naturally, unaligned accesses were slower than aligned accesses because they required an extra memory access. For more information on the instructions and architecture see Motorola datasehet The Motorola ” sixty-eight-oh-twenty “, ” sixty-eight-oh-two-oh ” or ” six-eight-oh-two-oh ” is a bit microprocessor from Motorolareleased in From Wikipedia, the free encyclopedia.

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