dsp56000 Freescale Semiconductor, Inc, dsp56000 Datasheet - Page 66

• Manufacturer Part Number: dsp56000
• Description: 24-bit Digital Signal Processor Family Manual
• Manufacturer: Freescale Semiconductor, Inc

DSP56K. The MMMM column indicates the hex value which should be stored in the Mn
register.
4.4.2.1
When the value in the modifier register is $FFFF, address modification is performed using
normal 16-bit linear arithmetic (see Table 4-2). A 16-bit offset, Nn, and + 1 or –1 can be
used in the address calculations. The range of values can be considered as signed (Nn
from –32,768 to + 32,767) or unsigned (Nn from 0 to + 65,535) since there is no arithmetic
4 - 16
Assembler Syntax: –Rn
Memory Spaces: P:, X:, Y:, L:
Additional Instruction Execution Time (Clocks): 2
Additional Effective Address Words: 0
EXAMPLE: MOVE X: –(R5),B1
55 48 47
3
7
B2
B B
0 23
Linear Modifier (Mn=$FFFF)
BEFORE EXECUTION
6
2
Figure 4-10 Address Register Indirect — Predecrement
B1
D 0
$3007
$3006
24 23
4 A
0 23
Freescale Semiconductor, Inc.
23
$ A B C D E F
$ 1 2 3 4 5 6
For More Information On This Product,
M5
R5
N5
X MEMORY
5
ADDRESS GENERATION UNIT
15
15
15
5
B0
$FFFF
$3007
XXXX
4
Go to: www.freescale.com
C
ADDRESSING
0
0
0
0
0
0
0
55 48 47
3
7
B2
B
0 23
1
2 3
AFTER EXECUTION
B1
4
$3007
$3006
5
24 23
6 A
0 23
23
$ A B C D E F
$ 1 2 3 4 5 6
M5
R5
N5
X MEMORY
5 5
15
15
15
B0
$FFFF
$3006
XXXX
4
MOTOROLA
C
0
0
0
0
0
0
0