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Fundamentals of Digital Logic and Microcomputer Design.
The added many improvements over datashest including a bit arithmetic logic unit ALUbit external data and address buses, extra instructions and additional addressing modes. The coprocessor interface is asynchronous, so it is possible to run the coprocessors at a different clock rate than the CPU.
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. The HP, and also use thetogether with a math coprocessor. This page was last edited on datasueet Septemberat This article needs additional citations for verification.
November Learn how and when to remove this template message. For more information on the instructions and architecture see Motorola Please help improve this article by adding citations to reliable sources. 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 In keeping with naming practices common to Motorola designs, the is usually referred to as the “”, pronounced “oh-two-oh” or “oh-twenty”. The Nortel Networks DMS telephone central office switch also used the as the first microprocessor of the SuperNode computing core. Naturally, unaligned accesses were slower than aligned accesses because they required an extra memory access.
MC Datasheet(PDF) – Motorola, Inc
Unsourced material may be challenged and removed. The and had a proper three-stage pipeline. It also found use in laser printers. Motorola-Freescale-NXP processors and microcontrollers. The Motorola ” sixty-eight-oh-twenty “, ” sixty-eight-oh-two-oh ” or ” six-eight-oh-two-oh ” is a bit microprocessor from Motorolareleased in Under the and later, this was made privileged, to better support virtualization software.
Multiprocessing support was ddatasheet externally by the use of a RMC pin  to indicate an indivisible read-modify-write cycle in progress. PGA pins used The UX shipped with Amiga Unix, requiring an ‘ or ‘ processor. The main CPU recognizes “F-line” instructions with the four most significant opcode bits all oneand datazheet special bus cycles to interact with a coprocessor to execute these instructions. 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 ‘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. Views Read Edit View history. Retrieved from ” https: While the had ‘supervisor datashdet, it did not meet the Popek and Goldberg virtualization requirements due to the single instruction ‘MOVE from SR’ being unprivileged but sensitive.
In other projects Wikimedia Commons. The ddatasheet is a lower cost version of the Motorola 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. It is also the processor used on board TGV trains to decode signalling information which is sent to the trains through the rails. The had no alignment restrictions on data access. The had a datqsheet byte direct-mapped instruction cache, arranged as 64 four-byte entries.
The new addressing modes added scaled indexing and another level of indirection to many of the pre-existing modes, dztasheet added quite a bit of flexibility to various indexing modes and operations. The had bit internal and external data and address buses, compared to the early x0 models with bit data and bit address buses.
The has a coprocessor interface supporting up to eight coprocessors. From Wikipedia, the free encyclopedia. In a multiprocessor system, coprocessors could not be shared datasheeet CPUs. 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 Although small, it still made a significant difference in the performance of many applications. Datashete is the successor to the Motorola and is succeeded by the Motorola Fixed branch prediction, branch-never-taken approach .
InRochester Electronics has re-established manufacturing capability for the microprocessor and it is still available today.
It is further being used in the flight control and radar systems of the Eurofighter Typhoon combat aircraft.