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For more information on the instructions and architecture see Motorola 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.
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. Fundamentals of Digital Logic and Microcomputer Design. Multiprocessing support was implemented externally by datasyeet use of a RMC pin  to indicate an indivisible read-modify-write cycle in progress.
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.
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Fixed branch prediction, branch-never-taken approach . The HP, and also use thetogether with a math coprocessor. The has a coprocessor interface supporting up to eight coprocessors. The had a small byte direct-mapped instruction cache, arranged as 64 four-byte entries. This page was last edited on 5 Septemberat Newer packaging methods allowed the ‘ to feature more external pins without the large size that the earlier dual in-line package method required.
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. InRochester Electronics has re-established manufacturing capability for the microprocessor and it is still available today.
MC Datasheet pdf – MICROPROCESSORS USERS MANUAL – 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 68EC lowered cost through a bit address bus.
In a multiprocessor system, coprocessors could not be shared between CPUs. The resulting decrease in bus traffic was particularly important in systems dxtasheet heavily on DMA. The had no alignment restrictions on data access.
MC Datasheet(PDF) – Motorola, Inc
It is further being 68002 in the flight control and radar systems of the Eurofighter Typhoon combat aircraft. The coprocessor interface is asynchronous, so it is possible to run the coprocessors at a different clock rate than the CPU.
From Wikipedia, the free encyclopedia. The and had a proper three-stage pipeline. 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.
All other processors had to hold off memory accesses until the cycle was complete. Views Read Edit View history. A lower cost version was also made available, known as the 68EC Please help improve this article by adding citations to reliable sources.
Naturally, unaligned accesses were slower than aligned accesses because they required an extra memory access. Wikimedia Datahseet has media related to Motorola Although small, it still made dztasheet significant difference in the performance of many applications. In other projects Wikimedia Commons. November Learn how and when to remove this template message.
Motorola-Freescale-NXP processors and microcontrollers. The Nortel Networks DMS telephone central office switch also used the as the first microprocessor of the SuperNode computing core. PGA pins used It is also the processor used on board TGV trains to decode signalling information which is sent to the trains through the rails.
The ‘s ALU was also natively bit, so could perform bit operations in one clock, whereas the datashee two clocks minimum due to its dataasheet ALU. It is the successor to the Motorola and is succeeded by the Motorola The replaced this with a proper instruction cache of bytes, the first 68k series processor to feature true on-chip cache memory.
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.