Addressing Modes
4.2.3 Immediate Data Modes
The immediate data modes specify the operand directly in a field of the instruction. That is, the operand value to be used is contained within the instruction word itself (or words themselves). There are two types of immediate data modes: immediate data, which uses an extension word to contain the operand, and immediate short data, where the operand is contained within the instruction word. Table 4-6 summarizes these two modes.
Table 4-6. |
Addressing Mode—Immediate |
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Addressing Mode: |
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Notation in the Instruction |
Examples |
Immediate |
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Set Summary |
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Immediate short data— 5, 6, 7-bit |
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#xx |
#14 |
(unsigned and signed) |
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#<3 |
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Immediate data— 16-bit |
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#xxxx |
#$369C |
(unsigned and signed) |
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#>1234 |
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Address Generation Unit |
4-17 |
Address Generation Unit
4.2.3.1 Immediate Data: #xxxx
This addressing mode requires one word of instruction extension. This additional word contains the 16-bit immediate data used by the instruction. This reference is classified as a program reference. Examples of the use and effects of immediate-data mode are shown in Figure 4-10 on page 4-18.
Immediate into 16-Bit Register Example: MOVE #$A987,B1
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Before Execution |
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After Execution |
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B2 |
B1 |
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B0 |
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B2 |
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B1 |
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B0 |
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B |
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X |
X X X X |
X X X X |
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B |
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X |
A 9 8 7 |
X X X X |
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35 |
32 |
31 |
16 |
15 |
0 |
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35 |
32 |
31 |
16 |
15 |
0 |
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Positive Immediate into 36-Bit Accumulator Example: MOVE #$1234,B
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Before Execution |
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After Execution |
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B2 |
B1 |
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B0 |
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B2 |
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B1 |
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B0 |
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B |
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X |
X X X X |
X X X X |
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B |
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0 |
1 |
2 3 4 |
0 |
0 0 0 |
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35 |
32 |
31 |
16 |
15 |
0 |
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35 |
32 |
31 |
16 |
15 |
0 |
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Negative Immediate into 36-Bit Accumulator Example: MOVE #$A987,B
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Before Execution |
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After Execution |
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B2 |
B1 |
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B0 |
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B2 |
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B1 |
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B0 |
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B |
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X |
X X X X |
X X X X |
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B |
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F |
A 9 8 7 |
0 |
0 0 0 |
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35 |
32 |
31 |
16 |
15 |
0 |
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35 |
32 |
31 |
16 |
15 |
0 |
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Assembler syntax: #xxxx
Additional instruction execution cycles: 1
Additional effective address program words: 1
AA0023
Figure 4-10. Special Addressing: Immediate Data
4-18 |
DSP56800 Family Manual |
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Addressing Modes
Immediate Short into 16-Bit Address Register Example: MOVE #$0027,N
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Before Execution |
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After Execution |
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N |
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XXXX |
N |
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$0027 |
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15 |
0 |
15 |
0 |
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Immediate Short into 16-Bit Data Register Example: MOVE #$FFC6,X0
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Before Execution |
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After Execution |
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X0 |
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XXXX |
X0 |
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$FFC6 |
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15 |
0 |
15 |
0 |
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Immediate Short into 16-Bit Accumulator Register Example: MOVE #$001C,B1
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Before Execution |
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After Execution |
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B2 |
B1 |
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B0 |
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B2 |
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B1 |
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B0 |
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B |
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X |
X X X X |
X X X X |
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B |
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X |
0 |
0 1 C |
X X X X |
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35 |
32 |
31 |
16 |
15 |
0 |
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35 |
32 |
31 |
16 |
15 |
0 |
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Positive Immediate Short into 36-Bit Accumulator Example: MOVE #$001C,B
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Before Execution |
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After Execution |
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B2 |
B1 |
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B0 |
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B2 |
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B1 |
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B0 |
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B |
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X |
X X X X |
X X X X |
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B |
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0 |
0 |
0 1 C |
0 |
0 0 0 |
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35 |
32 |
31 |
16 |
15 |
0 |
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35 |
32 |
31 |
16 |
15 |
0 |
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Negative Immediate Short into 36-Bit Accumulator Example: MOVE #$FFC6,B
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Before Execution |
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After Execution |
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B2 |
B1 |
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B0 |
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B2 |
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B1 |
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B0 |
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B |
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X |
X X X X |
X X X X |
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B |
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F |
F F C 6 |
0 |
0 0 0 |
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35 |
32 |
31 |
16 |
15 |
0 |
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35 |
32 |
31 |
16 |
15 |
0 |
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Assembler syntax: #xx
Additional instruction execution cycles: 0
Additional effective address program words: 0
AA0024
Figure 4-11. Special Addressing: Immediate Short Data
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Address Generation Unit |
4-19 |