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Encyclopedia > Motorola 68EC000
Motorola 68EC000 controller
Motorola 68EC000 controller

The 68EC000 is a microprocessor from Motorola. It is a low-cost version of the Motorola 68000, designed for embedded controller applications. The 68EC000 can have either a 8-bit or 16-bit data bus, switchable at reset.[1] Microprocessors, including an Intel 80486DX2 and an Intel 80386. ... Motorola (NYSE: MOT) is an American international communications company based in Schaumburg, Illinois, a Chicago suburb. ... The Motorola 68000 is a 32 bit CISC microprocessor, the first member of a successful family of microprocessors from Motorola, which were all mostly software compatible. ... 8-bit refers to the number of bits used in the data bus of a computer. ... In computer science, 16-bit is an adjective used to describe integers that are at most two bytes wide, or to describe CPU architectures based on registers, address buses, or data buses of that size. ... In computer architecture, a bus is a subsystem that transfers data or power between computer components inside a computer or between computers. ...

The processors are available in a variety of speeds including 8 and 16 MHz configurations, producing 2,100 and 4,376 Dhrystones each. These processors have no floating point unit and it is difficult to implement a FPU coprocessor (MC68881/2) with one because the EC series lacks necessary coprocessor instructions. A megahertz (MHz) is one million (106) hertz, a measure of frequency. ... Dhrystone is a synthetic benchmark program developed in 1984 by Reinhold P. Weicker intended to be representative of system (integer) programming. ... A floating point unit (FPU) is a part of a CPU specially designed to carry out operations on floating point numbers. ... A coprocessor is a computer processor used to supplement the functions of the primary processor (the CPU). ... The Motorola 68881 was a floating-point coprocessor chip that was utilized in some computer systems that used the 68020 or 68030 CPU. The addition of the 68881 chip added substantial cost to the computer, but added a floating point unit that could rapidly perform floating point math calculations. ...

The 68EC000 was used as a controller in many audio applications, including Ensoniq musical instruments and sound cards where it was part of the MIDI synthesizer.[2] On Ensoniq sound boards, the controller provided several advantages compared to competitors without a CPU onboard. The processor allowed the board to be configured to perform various audio tasks, such as MPU-401 MIDI synthesis or MT-32 emulation, without the use of a TSR program. This improved software compatibility, lowered CPU usage, and eliminated host system memory usage. Ensoniq Corp. ... Note names and MIDI note numbers Musical Instrument Digital Interface, or MIDI, is an industry-standard electronic communications protocol that defines each musical note or event in an electronic musical instrument or show device such as a synthesizer, precisely and concisely, allowing electronic musical instruments, computers and other show equipment... The MPU-401, where MPU stands for MIDI Processing Unit, is an important but now obsolescent standard for MIDI interfaces on the PC platform. ... The Roland MT-32 is a MIDI synthesizer module first released in 1987 by the Roland Corporation. ... Terminate and Stay Resident (TSR) computer programs were the only way to achieve a primitive sort of multitasking (usually just task-switching) using the DOS operating system. ...

It also was used as a sound controller in the Sega Saturn game console. The Sega Saturn ) is a 32-bit video game console, first released on November 22, 1994 in Japan, April 27, 1995 in North America and July 8, 1995 in Europe. ...


  1. ^ Boys, Robert. M68k Frequently Asked Questions (FAQ), comp.sys.m68k, October 19, 1994.
  2. ^ Soundscape Elite Specs. from Fax Sheet, Google Groups, April 25, 1995.
List of Motorola/Freescale microprocessors
The 6800 family : 6809 (see also: Hitachi 6309)
68000 family : 68000 | 68008 | 68010 | 68012 | 68020 | 68030 | 68040 | 68060 | ColdFire | DragonBall
Low-cost variants: 68EC000 | 68EC020 | 68EC030 | 68EC040 | 68LC040
Pre-PowerPC RISC : 88000
Floating-point coprocessors : 68881, 68882
PowerPC family (as part of AIM) : PPC 7XX range (aka "PowerPC G3") | PPC 7XXX range (aka "PowerPC G4")



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