Motorola DSP96002 - Manual (Page 261)

MOTOROLA DSP96002 USER’S MANUAL A - 73
DEC Decrement by One DEC
10 0111 uu11 1ddd
31 14 13 0
OPTIONAL EFFECTIVE ADDRESS EXTENSION OR IMMEDIATE LONG DATA
DATA BUS MOVE FIELD
Instruction Fields:
(u u)
D d d d
Dn.L n n n where nnn = 0-7
Operation:
D.L - 1
→
D.L (parallel data bus move)
Assembler Syntax:
DEC D (move syntax - see the MOVE instruction
description.)
Description:
Decrement by one the low portion of the specified operand. The result is stored in the low portion of D.
Input Operand(s) Precision: 32-bit integer.
Output Operand Precision: 32-bit integer.
CCR Condition Codes:
C - Set if a borrow is generated from the MSB of the result. Cleared otherwise.
V - Set if result overflows. Cleared otherwise.
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: DEC D (move syntax - see the MOVE instruction description.)
Timing: 2 + mv oscillator clock cycles
Memory: 1 + mv program words