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Portfolio

 

 

 

 

 

 

Portfolio

Introduction

Motorola 68000 - (MC68000) the first constituent of Motorola, Inc.'s family of 16- and 32-bit microprocessors. The successor to the Motorola 6809 and pursued by the Motorola 68010. The 68000 has 32-bit lists but only a 16-bit ALU and external data bus. It has 24-bit addressing and a linear address space, with no one of the bad segment lists of Intel's up to designated day processors that make programming them unpleasant. That entails that a lone exactly accessed array or structure can be bigger than 64KB in size. Addresses are computed as 32 bit, but the peaks 8 bits are slashing to fit the address coach into a 64-pin package (address and data share a coach in the 40 pin packages of the 8086 and Zilog Z8000).

The 68000 has sixteen 32-bit lists, divide into data and address registers. One address list is booked for the Stack Pointer. Any list, of either kind, can be utilized for any function except direct addressing. Only address lists can be utilized as the source of an address, but data lists can supply counteract from an address. Like the Zilog Z8000, the 68000 characteristics a supervisor and client mode, each with its own Stack Pointer. The Zilog Z8000 and 68000 are alike in capabilities, but the 68000 is 32 bits internally, producing it much quicker and eradicating compelled segmentations.Like numerous other CPUs of its generation, it can convey the next direction throughout execution (2 stage pipeline).The 68000 was utilized in numerous workstations, especially early Sun-2 machines, and individual computers, especially Apple Computer's first Macintoshes and the Amiga. It was furthermore utilized in most of Sega's early arcade machines, and in the Genesis/Megadrive consoles.

Motorola 68000 (MC68000) is the first constituent of 680x0 lines of microprocessors. Internally the 68000 is a 32-bit microprocessor - it has 32-bit data and address registers. Externally the processor has 16-bit data coach and 24-bit address coach, which restricts the dimensions of addressable recollection to 16 MB. Motorola furthermore made 68008 - a type of 68000 CPU with 8-bit external facts and numbers bus. In supplement to rudimentary HMOS 68000 and 68008 processors the next modifications were produced:

68HC000 - low-power HCMOS type of Motorola 68000

68HC001 - low-power HCMOS type with selectable 8/16 bit external facts and numbers bus.

68EC000 - embedded type

68SEC000 - embedded type of Motorola 68000 with static centre

The 68000 architecture was much more flexible than other CPU families (z80, 80x86, z80000, etc) from programming issue of outlook as it could be effortlessly amplified to support full 32-bit data and address buses. This was finished in Motorola 68020 family.

HMOS 68000 processors were constructed at races up to 16 MHz. HCMOS 68000 microprocessors are still constructed at this time (May 2007) at races up to 20 MHz.

 

Technical Background

Motorola presented its first microprocessor in 1974: the 8 bit MC6800 with a comprehensive line of support peripherals shortly available. The MC68000 was presented in 1979 and was shortly pursued by an owner of 16 bit peripheral ...