Stereo System User Manual

MOTOROLA DSP96002 USER’S MANUAL A - 85
EXTB Sign Extend Byte EXTB
Instruction Fields:
(u u)
Dddd
Dn.L n n n where nnn = 0-7
Timing: 2 + mv oscillator clock cycles
Memory: 1 + mv program words
10 0001 uu01 1ddd
31 14 13 0
OPTIONAL EFFECTIVE ADDRESS EXTENSION OR IMMEDIATE LONG DATA
DATA BUS MOVE FIELD
Operation:
D.L {7:0} → D.L {7:0} (parallel data bus move)
D.L {7} → D.L {31:8}
Assembler Syntax:
EXTB D (move syntax - see the MOVE in-
struction description.)
Description:
Sign extend the lower byte of D.L into the upper 24 bits of D.L.
Input Operand(s) Precision: 8-bit integer.
Output Operand Precision: 32-bit integer.
CCR Condition Codes:
C - Not affected.
V - Always cleared.
Z - Set if result is zero. Cleared otherwise.
N - Set if result is negative. Cleared otherwise.
I - Not affected.
LR - Not affected.
–
R - Not affected.
A - Not affected.
ER Status Bits: Not affected.
IER Flags: Not affected.
Instruction Format: EXTB D (move syntax - see the MOVE instruction description.)