Table 1-3. Notational Conventions (Continued)
Data Format And Type
+ inf Positive Infinity
<fmt> Operand Data Format: Byte (B), Word (W), Long (L), Single (S), Double (D), Extended (X), or
Packed (P).
B, W, L Specifies a signed integer data type (twos complement) of byte, word, or long word.
D Double-precision real data format (64 bits).
k A twos complement signed integer (–64 to +17) specifying a number’s format to be stored in
the packed decimal format.
P Packed BCD real data format (96 bits, 12 bytes).
S Single-precision real data format (32 bits).
X Extended-precision real data format (96 bits, 16 bits unused).
– inf Negative Infinity
Subfields and Qualifiers
#<xxx> or #<data> Immediate data following the instruction word(s).
( ) Identifies an indirect address in a register.
[ ] Identifies an indirect address in memory.
bd Base Displacement
ccc Index into the MC68881/MC68882 Constant ROM
dnDisplacement Value, n Bits Wide (example: d16 is a 16-bit displacement).
LSB Least Significant Bit
LSW Least Significant Word
MSB Most Significant Bit
MSW Most Significant Word
od Outer Displacement
SCALE A scale factor (1, 2, 4, or 8, for no-word, word, long-word, or quad-word scaling, respectively).
SIZE The index register’s size (W for word, L for long word).
{offset:width} Bit field selection.
Register Names
CCR Condition Code Register (lower byte of status register)
DFC Destination Function Code Register
FPcr Any Floating-Point System Control Register (FPCR, FPSR, or FPIAR)
FPm, FPn Any Floating-Point Data Register specified as the source or destination, respectively.
IC, DC, IC/DC Instruction, Data, or Both Caches
MMUSR MMU Status Register
PC Program Counter
Rc Any Non Floating-Point Control Register
SFC Source Function Code Register
SR Status Register
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