Motorola DSP96002 - Manual (Page 79)

MOTOROLA DSP96002 USER’S MANUAL 6 - 3
6.2.2 Fixed-Point Arithmetic Instructions
The fixed-point arithmetic instructions perform all operations within the Data ALU. Arithmetic instructions
are register-based (register direct addressing modes used for operands) so that the Data ALU operation
indicated by the instruction does not use the X Data Bus, the Y Data Bus, or the Global Data Bus. This
allows for parallel data movement over these buses during most Data ALU operations. This allows new
data to be pre-fetched for use in following instructions and results calculated by previous instructions to be
stored. Fixed-point arithmetic instructions execute in one instruction cycle. See Figure 6-2 for a list of the
thirty fixed-point arithmetic instructions.
Figure 6-2. Fixed-Point Arithmetic Instructions
ABS Absolute Value
ADD Add
ADDC Add with Carry
ASL Arithmetic Shift Left
ASR Arithmetic Shift Right
CLR Clear an Operand
CMP Compare
CMPG Graphics Compare with Trivial Accept/Reject Flags
DEC Decrement by one
EXT Sign Extend 16-Bit To 32-Bit
EXTB Sign Extend 8-Bit To 32-Bit
GETEXP Get Exponent
INC Increment by One
INT Floating-Point to Integer Conversion
INTRZ Floating-Point to Integer Conversion Round to Zero
INTU Floating-Point to Unsigned Integer Conversion
INTURZ Floating-Point to Un. Integer Conversion Round to Zero
JOIN Join Two 16-Bit Integers
JOINB Join Two 8-Bit Integers
MPYS Signed Multiply
MPYU Unsigned Multiply
NEG Negate
NEGC Negate with Carry
SETW Set an Operand
SPLIT Extract a 16-Bit Integer
SPLITB Extract an 8-Bit Integer
SUB Subtract
SUBC Subtract with Carry
TFR Transfer Data ALU Register
TST Test an Operand