M68ICS08ABUM/D
B-1
APPENDIX B
GLOSSARY
—0-9—
8-bit MCU
A microcontroller whose data is
communicated over a data bus made up of
eight separate data conductors. Members
of the MC68HC908 Family of
microcontrollers are 8-bit MCUs.
—A—
A
An abbreviation for the accumulator of
the MC68HC908AB32 MCU.
accumulator
An 8-bit register of the
MC68HC908AB32 CPU. The contents of
this register may be used as an operand of
an arithmetic or logical instruction.
assembler
A software program that translates source
code mnemonics into opcodes that can
then be loaded into the memory of a
microcontroller.
assembly language
Instruction mnemonics and assembler
directives that are meaningful to
programmers and can be translated into
an object code program that a
microcontroller understands. The CPU
uses opcodes and binary numbers to
specify the operations that make up a
computer program. Humans use
assembly language mnemonics to
represent instructions. Assembler
directives provide additional information
such as the starting memory location for a
program. Labels are used to indicate an
address or binary value.
ASCII
American Standard Code for Information
Interchange. A widely accepted
correlation between alphabetic and
numeric characters and specific 7-bit
binary numbers
—B—
breakpoint
During debugging of a program, it is
useful to run instructions until the CPU
gets to a specific place in the program,
and then enter a debugger program. A
breakpoint is established at the desired
address by temporarily substituting a
software interrupt (SWI) instruction for
the instruction at that address. In response
to the SWI, control is passed to a
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