Dec - Motorola DSP56000 Manual

24-bit digital signal processor
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DEC

Operation:
D–1
D
Description: Decrement by one the specified operand and store the result in the destina-
tion accumulator. One is subtracted from the LSB of D.
Example:
:
DEC
A
:
Explanation of Example: One is subtracted from the content of the A accumulator.
Condition Codes:
15
14
13
LF
DM
L — Set if overflow has occurred in result. Not affected otherwise
E — Set if the signed integer portion of result is in use
U— Set if result is unnormalized
N — Set if bit 55 of result is set
Z — Set if result equals zero
V — Set if overflow has occurred in result
C — Set if a borrow occurs from bit 55 of result
A - 80
INSTRUCTION DESCRIPTIONS
Decrement by One
;Decrement the content of A accumulator by one
12
11
10
9
T
**
S1
S0
I1
MR
INSTRUCTION SET DETAILS
Assembler Syntax:
DEC
D
8
7
6
5
4
I0
S
L
E
U
CCR
DEC
3
2
1
0
N
Z
V
C
MOTOROLA

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