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CHAPTER 7 DETAILED EXECUTION INSTRUCTIONS
7.124 ADDSP (Add Stack Pointer and Immediate Data)
Adds 4 times the immediate data as a signed extended value, to the value in "R15".
■ ADDSP (Add Stack Pointer and Immediate Data)
Assembler format: ADDSP #s10
Operation: R15 + exts (s8 × 4) → R15
Flag change:
N, Z, V, and C: Unchanged
Execution cycles: 1 cycle
Instruction format:
Example: ADDSP # – 4
NZVC
––––
MSB LSB
10100011
s8
R15
8000 0000
R15
7FFF FFFC
Instruction bit pattern : 1010 0011 1111 1111
Before execution After execution