dsp56000 Freescale Semiconductor, Inc, dsp56000 Datasheet - Page 111

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

6.3.5.3.5
The address of the operand occupies six bits in the instruction operation word, allowing
addresses $0000–$003F to be accessed (see Figure 6-11). Classified as both a memory
reference and program reference, the address is zero extended to 16 bits when used to
address an operand or program memory.
6.3.5.3.6
Classified as a memory reference, the I/O short addressing mode is similar to absolute
short addressing. The address of the operand occupies six bits in the instruction operation
word. I/O short is used with the bit manipulation and MOVEP instructions. The I/O short
address is ones extended to 16 bits to address the I/O portion of X and Y memory
(addresses $FFC0–$FFFF – see Figure 6-12).
6.3.5.3.7
Some instructions make implicit reference to PC, SS, LA, LC, or SR. For example, the
jump instruction (JMP) implicitly references the PC; whereas, the repeat next instruction
(REP) implicitly references LC. The registers implied and their uses are defined by the
individual instruction descriptions (see APPENDIX A - INSTRUCTION SET DETAILS).
6.3.5.4
MOTOROLA
Assembler Syntax: XXXX or aa
Memory Spaces: P:
Additional Instruction Execution Time (Clocks): 2
Additional Effective Address Words: 1
55
7
EXAMPLE: MOVE Y:$5432,B0
X
B2
X
48 47
0 23
Addressing Modes Summary
X X X X X X
BEFORE EXECUTION
Absolute Short
I/O Short
Implicit Reference
Figure 6-8 Special Addressing – Absolute Addressing
B1
$5432
Freescale Semiconductor, Inc.
24 23
0 23
INSTRUCTION SET INTRODUCTION
For More Information On This Product,
23 Y MEMORY 0
A B C D E F
X X X X X X
INSTRUCTION FORMATS
Go to: www.freescale.com
B0
0
0
55
7
X
B2
X
48 47
0 23
X X X X X X
AFTER EXECUTION
B1
$5432
24 23
0 23
23 Y MEMORY 0
A B C D E F
A B C D E F
B0
6 - 17
0
0