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A lower cost version was also made available, known as the 68EC In keeping with naming practices common to Motorola designs, the is usually referred to as the “”, pronounced “oh-two-oh” or “oh-twenty”. Although small, it still made a significant difference in the performance of many applications. Views Read Edit View history.

Motorola 68020

It is also the processor used on board TGV trains to decode signalling information which is sent to the trains through the rails. The coprocessor interface is asynchronous, so it is possible to run the coprocessors at a different clock rate than the CPU. The replaced this with a proper instruction cache of bytes, the first 68k datssheet processor to feature true on-chip cache memory.

It also found use in laser printers. Motorola-Freescale-NXP processors and microcontrollers. The 68EC lowered cost through a bit address bus. 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. PGA pins used In other projects Wikimedia Commons.

Motorola – Wikipedia

The has a coprocessor interface supporting up to eight coprocessors. By using this site, you agree to the Terms of Use and Privacy Policy. November Learn how and when to remove this template message. This page was last edited on 5 Septemberat The Motorola ” sixty-eight-oh-twenty “, ” sixty-eight-oh-two-oh ” or ” six-eight-oh-two-oh ” is a bit microprocessor from Motorolareleased in Fundamentals of Digital Logic and Microcomputer Design.


The HP datasjeet,and also use thetogether with a math coprocessor. It is the successor to the Motorola and is succeeded by the Motorola The Nortel Networks DMS telephone central office switch also used the as the first microprocessor of the SuperNode computing core. Multiprocessing support was implemented externally by the use of a RMC pin [1] to indicate an indivisible read-modify-write cycle in progress. From Wikipedia, the free encyclopedia. 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.

Ratasheet the and later, this was made privileged, to better support virtualization software. This article needs additional citations for verification.

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 datashest FPUs to be the same model as well. Please help improve this article by adding citations to reliable sources. For more information on the instructions and architecture see Motorola Though it was not intended, these new modes made the very suitable for page printing; most laser printers 680020 the early s had a 68EC at their core.

Fixed branch prediction, branch-never-taken approach [15]. All other processors had to hold off memory accesses until the cycle was complete. The had bit internal and external data and address buses, compared to the early x0 models with bit data and bit address buses. 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 had a small byte direct-mapped instruction cache, arranged as 64 four-byte entries. The had no alignment restrictions on data access.


It is further being used in the flight control and radar systems of the Eurofighter Typhoon combat aircraft. Unsourced material may be challenged and removed. Datashest packaging methods allowed the ‘ to feature more external pins without the large size that the earlier dual in-line package method required. 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 ‘s ALU was also natively bit, so could dahasheet 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 today.

Retrieved from ” https: The resulting decrease in bus traffic was particularly important in systems relying heavily on DMA. 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.

Naturally, unaligned accesses were slower than aligned accesses because they required an extra memory access. While the dafasheet ‘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 and had a proper three-stage pipeline. 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 UX shipped with Amiga Unix, requiring an ‘ or ‘ processor.