St (Store Word Data In Program Status Register To Memory) - Fujitsu FR Family Instruction Manual

7.75

ST (Store Word Data in Program Status Register to Memory)

Subtract 4 from the value of "R15", store the word data in the program status (PS) to the
memory address indicated by the new value of "R15".
■ ST (Store Word Data in Program Status Register to Memory)
Assembler format: ST PS, @ – R15
Operation: R15 – 4 → R15
PS → (R15)
Flag change:
N, Z, V, and C: Unchanged
Execution cycles: a cycle(s)
Instruction format:
Example: ST PS, @ – R15
N Z V C
– – – –
MSB
0 0 0 1
R15
1 2 3 4 5 6 7 8
PS F F F 8 F 8 C 0
Memory
12345670
x x x x x x x x
12345674
Before execution
CHAPTER 7 DETAILED EXECUTION INSTRUCTIONS
0 1 1 1 1 0
LSB
0 1 0 0 0 0
R15
1 2 3 4 5 6 7 4
PS F F F 8 F 8 C 0
Memory
12345670
12345674 F F F 8 F 8 C 0
After execution
171