The Freescale 683XX (formerly Motorola 683XX) is a family of compatible microcontrollers that use a Freescale 68000-based CPU core. The family was designed using a Hardware Description Language, making the parts synthesizable, and amenable to improved fabrication processes, such as die shrinks. The integrated circuit from an Intel 8742, a 8-bit microcontroller that includes a CPU running at 12 MHz, 128 bytes of RAM, 2048 byte of EPROM, and I/O in the same chip. ... American corporation Freescale Semiconductor, Inc. ... The Motorola 68000 is a CISC microprocessor, the first member of a successful family of microprocessors from Motorola, which were all mostly software compatible. ... CPU redirects here. ... In electronics, a hardware description language or HDL is any language from a class of computer languages for formal description of electronic circuits. ...

There are two CPU cores used in the 683XX family: the 68EC000 and the CPU32. The instruction set of the CPU32 core is similar to the 68020 without bitfield instructions, and with a few instructions unique to the CPU32 core, such as table lookup and interpolate instructions, and a low-power stop mode. Motorola 68EC000 controller The 68EC000 is a microprocessor from Motorola. ... The Motorola 68020 is a microprocessor from Motorola. ... A bit field is a common idiom used in computer programming to store a set of Boolean datatype flags compactly, as a series of bits. ...

The modules of the microcontroller were designed independently and released as new CPUs could be tested. This process let the architects perform "design-ahead" so that when silicon technlogies were available, Motorola had designs ready to implement and go to market. Many of these submodules have been carried forward into the Coldfire line of processors. The Motorola Coldfire is a 68k architecture microprocessor manufactured for embedded systems development by Motorola (now Freescale Semiconductor). ...

The microcontrollers consist of a series of modules, connected by an internal bus:

• A fully-static CPU core, capable of running at any clock speed from dead stop to maximum rated speed (25 or 33MHz).
• A CPU core designed to minimize transistors while maximizing performance.
• A high-speed clocked serial interface for debugging called background debug mode (BDM). The 683XX-series was the first to have a clocked serial interface to the CPU to perform debugging. Now, many CPUs use a standard serial test interface, usually JTAG, for this purpose.
• The SIM (System Interface Module), which eliminates much glue logic by providing chip selects and address decoding. The SIM also provides a clock generator, watchdogs for various system operations, configuration of processor pins, a periodic timer, and an interrupt controller.

Other modules available on various processors in the 683XX family are: An in-circuit emulator (ICE) also called on-circuit debugger (OCD) or background debug module (BDM) is a hardware device used to debug the software of an embedded system. ... JTAG, an acronym for Joint Test Action Group, is the usual name used for the IEEE 1149. ... In electronics, glue logic refers to the custom electronic circuitary needed to ensure compatibility for interfacing off-the-shelf semiconductor components. ...

• The Timing Processor Unit (TPU), which performs almost any timing related task: timers, counters, proportional pulse width control, pulse width measurement, pulse generation, stepper motor controllers, quadrature detection, etc. Freescale gives the development system and code away for free.
• An auxiliary RAM doubles as a programmable microcontroller store for the TPU.
• Some early models have two conventional counter-timers.
• A general purpose timer (GPT) module provides pulse accumulators, capture/compare, and Pulse-width modulation capabilities.
• Some models have a network interface processor in the form of a communications processor module (CPM) and serial communications controllers (SCC) which can be interfaced to Ethernet or HDLC busses.
• Most models have a queued serial module (QSM) which provides both synchronous Serial Peripheral Interface, and logic-level RS232 UART capabilities.

External links

• Freescale M683xx processors