The Motorola 68HC11 (6811 or HC11 for short) is a microcontroller (µC) family from Motorola, descended from the Motorola 6800 microprocessor, and a subfamily of the 68h family. The 68HC11 devices are more powerful and more expensive than the 68HC05 microcontrollers, and are used in barcode readers, hotel card key writers, and various other embedded systems. A microcontroller is a computer-on-a-chip optimised to control electronic devices. ... Motorola (NYSE: MOT) (TYO: 6686) is a global communications company based in Schaumburg, Illinois, a Chicago suburb. ... The 6800 is a microprocessor produced by Motorola and released shortly after the Intel 8080 in 1975. ... Microprocessors, including an Intel 80486DX2 and an Intel 80386 A microprocessor (abbreviated as µP or uP) is an electronic computer central processing unit (CPU) made from miniaturized transistors and other circuit elements on a single semiconductor integrated circuit (IC) (aka microchip or just chip). ... The 68h family of 8-bit processors is based upon the Motorola 6800 CPU. However not just Motorola produced or innovated on that design. ... Wikipedia encoded in Code 128-B 2D barcode example A barcode (also bar code) is a machine-readable representation of information in a visual format on a surface. ... An embedded system is a special-purpose computer system, which is completely encapsulated by the device it controls. ...

The MC68HC11A8 is available in a 48-pin dual in-line package (DIP), as well as the 52-pin plastic leaded chip carrier (PLCC) as shown above.

Internally, the HC11 instruction set is upward compatible with the 6800, with the addition of a Y index register. (Instructions using the Y register are prefixed with byte such as 0x18). It has two eight-bit accumulators, A and B, two sixteen-bit index registers, X and Y, a processor flag register, a 16-bit stack pointer, and a program counter. In addition, some instructions treat the A and B registers as a combined 16-bit D register. Motorola 68HC11 Microcontroller and supporting chips, taken by PlatinumX on July 17, 2004 with a Canon Powershot A70 and cropped with the GIMP File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Motorola 68HC11 Microcontroller and supporting chips, taken by PlatinumX on July 17, 2004 with a Canon Powershot A70 and cropped with the GIMP File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... IC in a DIP14-Package In electronics, a Dual In-line Package (DIP), sometimes called a DIL package, is an electronic device package with a rectangular housing and a row of electrical connecting pins along each of two opposite sides, usually the longer sides of the rectangle. ... PLCC stands for Plastic Leaded Chip Carrier. ... An instruction set, or instruction set architecture (ISA), describes the aspects of a computer architecture visible to a programmer, including the native datatypes, instructions, registers, addressing modes, memory architecture, interrupt and exception handling, and external I/O (if any). ... An index register in a computer CPU is a processor register used for modifying operand addresses during the run of a program, typically for doing vector/array operations. ... In mathematics and computer science, hexadecimal, or simply hex, is a numeral system with a radix or base of 16 usually written using the symbols 0–9 and A–F or a–f. ... 8-bit refers to the number of bits used in the data bus of a computer. ... In a CPU, an accumulator is a register in which intermediate results are stored. ... 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. ... An index register in a computer CPU is a processor register used for modifying operand addresses during the run of a program, typically for doing vector/array operations. ... A stack is a data structure that works on the principle of Last In First Out (LIFO). ... The program counter (also called the instruction pointer in some computers) is a register in a computer processor which indicates where the computer is in its instruction sequence. ...

The HC11 has five external ports, A, B, C, D, and E. Each port is eight-bits wide except for D, which is six bits (in some variations of the chip, D also has eight bits). It can be operated with an internal program and RAM (1 to 768 bytes) or an external memory of up to 64 kilobytes. With external memory, B and C are used as address and data bus. In this mode, port C is multiplexed to carry both the lower byte of the address and data. Different types of RAM. From top to bottom: DIP, SIPP, SIMM 30 pin, SIMM 72 pin, DIMM, RIMM RAM redirects here. ... A kilobyte (derived from the SI prefix kilo-) is a unit of information or computer storage equal to either 1024 or 1000 bytes. ... An address bus is (part of) a computer bus, used by CPUs or DMA-capable units for communicating the physical addresses of computer memory elements/locations that the requesting unit wants to access (read/write). ... In computer architecture, a bus is a subsystem that transfers data or power between computer components inside a computer or between computers. ... Time-division multiplexing (TDM) is a type of digital multiplexing in which two or more apparently simultaneous channels are derived from a given frequency spectrum, i. ...

A MC68HC24 port replacement unit is available for the HC11. When placed on the external address bus, it replicates the original functions of B and C. Port A has input capture, output compare, pulse accumulator, and other timer functions; port D has serial I/O, and port E has an analog to digital converter (ADC). This article or section should include material from AD converters In electronics, an analog-to-digital converter (abbreviated ADC, A/D, or A to D) is a device that converts continuous signals to discrete digital numbers. ...

The popular Handy Board robotics controller is based on the 68HC11. The Handy Board is a popular handheld robotics controller. ...

External links

A website with technical information about the 68HC11.

The Free On-line Dictionary of Computing (FOLDOC) is an on-line, searchable encyclopedic dictionary of computing subjects. ... GNU logo The GNU Free Documentation License (GNU FDL or simply GFDL) is a copyleft license for free content, designed by the Free Software Foundation (FSF) for the GNU project. ...

List of Motorola/Freescale microcontrollers

6801/6803 | 6802 | 6804 | 68HC05 | 68HC08 | 68HC11 | 68HC12 | 68HC16 | 683XX (CPU32) | M*CORE | MPC500 | PowerQUICC I/II/III | DSP568XX (DSPcontroller) Image File history File links The M-logo graphic of the Motorola logo, cropped from Image:Motologo. ... Image File history File links Logo graphic part of Freescale Semiconductor logo, cropped from Image:FreescaleSemiconductor. ... The following is a categorized list of Motorola products; end user appliances, automotive products (Motorola Automotive Group, has a facility in Northbrook, IL), lighting products (Motorola Lighting Inc. ... The Motorola 68HC12 (6812 or HC12 for short) is a 16-bit microcontroller family from Motorola. ... The Motorola 683XX aka CPU32 is a family of compatible microcontrollers that use a Motorola 68000 CPU core. ... The Motorola 56000 (56k) is a family of DSP chips produced by Motorola from the 1980s on, still continuing to be produced in more advanced models in the 2000s. ...