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(8-bit accumulator), X (8-bit index
register), CCR (condition code register
containing the H, I, N, Z, and C bits), SP
(stack pointer), and PC (program
counter). Memory locations that hold
status and control information for on-chip
peripherals are called I/O and control
registers.
reset
Reset is used to force a computer system
to a known starting point and to force
on-chip peripherals to known starting
conditions.
—S—
S-record
A Motorola standard format used for
object code files.
simulator
A computer program that copies the
behavior of a real MCU.
source code
See source program
SP
Abbreviation for stack pointer CPU
register in the MC68HC908AB32 MCU.
source program
A text file containing instruction
mnemonics, labels, comments, and
assembler directives. The source file is
processed by an assembler to produce a
composite listing and an object file
representation of the program.
stack pointer
A CPU register that holds the address of
the next available storage location on the
stack.
M68ICS08ABUM/D
APPENDIX B – GLOSSARY
—T—
—U—
—V—
V
DD
The positive power supply to a
microcontroller (typically 5 volts dc).
V
SS
The 0 volt dc power supply return for a
microcontroller.
—W—
Word
A group of binary bits. Some larger
computers consider a set of 16 bits to be a
word but this is not a universal standard.
—X—
X
Abbreviation for index register, a CPU
register in the MC68HC908AB32.
—Y—
—Z—
Z
Abbreviation for zero, a bit in the
condition code register of the
MC68HC908AB32. A compare
instruction subtracts the contents of the
tested value from a register. If the values
were equal, the result of this subtraction
would be 0 so the Z bit would be set; after
a load accumulator instruction, the Z bit
will be set if the loaded value was $00.
B-5
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