Microprocessor Theory and Applications with 68000/68020 and Pentium

APPENDIX B

GLOSSARY

Absolute Addressing: This addressing mode specifies the address of data with the instruction.

Accumulator: Register used for storing the result after most ALU operations; available with 8-bit microprocessors.

Address: A unique identification number (or locator ) for source or destination of data. An address specifies the register or memory location of an operand involved in the instruction.

Addressing Mode: The manner in which a microprocessor determines the effective address of source and destination operands in an instruction.

Address Register: A register used to store the address (memory location) of data.

Address Space: The number of storage location in a microcomputer's memory that can be directly addressed by the microprocessor. The addressing range is determined by the number of address pins provided with the microprocessor chip.

American Standard Code for Information Interchange (ASCII): An 8-bit code commonly used with microprocessors for representing alphanumeric codes.

Analog-to-Digital (A/D) Converter: Transforms an analog voltage into its digital equivalent.

AND gate: The output is 1, if all inputs are 1; otherwise the output is 0.

Arithmetic and Logic Unit (ALU): A digital circuit which performs arithmetic and logic operations on two n-bit numbers.

ASIC: Application Specific IC. Chips designed for a specific, limited application. Normally reduces the total manufacturing cost of a product by reducing chip count.

Assembler: A program that translates ...