dsp56800e Freescale Semiconductor, Inc, dsp56800e Datasheet - Page 92
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dsp56800e
Manufacturer Part Number
dsp56800e
Description
16-bit Digital Signal Controller Core
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.DSP56800E.pdf
(706 pages)
- Current page: 92 of 706
- Download datasheet (4Mb)
Data Types and Addressing Modes
3.6.5.1
For the absolute short addressing mode, the address of the operand occupies 6 bits in the instruction
operation word and is zero extended to 24 bits. This scheme allows direct access to the first 64 locations in
X memory. No registers are used to form the address of the operand.
Figure 3-30 demonstrates this addressing mode. Note the use of the assembler forcing operator (<) in this
example (see Table 3-13 on page 3-26).
3-42
Available for: Word
Assembler Syntax: X:aa
Additional Instruction Execution Cycles: 0
Additional Effective Address Program Words: 0
Absolute Short Address: aa
$000003
$000000
Figure 3-30. Absolute Addressing: 6-Bit Absolute Short Address
R2
15
15
Absolute Short Address Example:
X
Before Execution
X Memory
$ABCD
X
X
DSP56800E Core Reference Manual
X
0
0
MOVE.W R2,X:<$0003
$000003
$000000
R2
15
15
A
After Execution
X Memory
$ABCD
B
Freescale Semiconductor
C
D
0
0
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