MOTOROLA
2-4
NOTATION
CPU16
REFERENCE MANUAL
2.8 Symbols and Operators
2.9 Conventions
Logic level one
is the voltage that corresponds to Boolean true (1) state.
Logic level zero
is the voltage that corresponds to Boolean false (0) state.
Set
refers specifically to establishing logic level one on a bit or bits.
Cleared
refers specifically to establishing logic level zero on a bit or bits.
Asserted
from logic level one to logic level zero when asserted, and an active high signal chang-
es from logic level zero to logic level one.
means that a signal is in active logic state. An active low signal changes
Negated
changes from logic level zero to logic level one when negated, and an active high sig-
nal changes from logic level one to logic level zero.
means that an asserted signal changes logic state. An active low signal
ADDR
is the mnemonic for address bus.
DATA
is the mnemonic for data bus.
LSB
ences to low and high bytes are spelled out.
means least significant bit or bits.
MSB
means most significant bit or bits. Refer-
+ — Addition
- — Subtraction or negation (twos complement)
* — Multiplication
/ — Division
> — Greater
< — Less
= — Equal
≥
— Equal or greater
≤
— Equal or less
≠
— Not equal
— AND
; — Inclusive OR (OR)
⊕
— Exclusive OR (EOR)
NOT — Complementation
: — Concatenation
— Transferred
— Exchanged
±
— Sign bit; also used to show tolerance
— Sign extension
% — Binary value
$ — Hexadecimal value
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