FUJITSU FR family 32-bit microcontroller instruction manuel CM71-00101-5E - Manual (Page 193)

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CHAPTER 7 DETAILED EXECUTION INSTRUCTIONS
7.73 ST (Store Word Data in Register to Memory)
Subtracts 4 from the value of "R15", stores the word data in "Ri" to the memory address
indicated by the new value of "R15".
If "R15" is given as the parameter "Ri", the data transfer will use the value of "R15"
before subtraction.
■
ST (Store Word Data in Register to Memory)
Assembler format: ST Ri, @ – R15
Operation: R15 – 4
→
R15
Ri → (R15)
Flag change:
N, Z, V, and C: Unchanged
Execution cycles: a cycle(s)
Instruction format:
Example: ST R3, @ – R15
N Z V C
– – – –
MSB LSB
0 0 0 1 0 1 1 1 0 0 0 0 Ri
12345674
R3 R3 8 7 6 5 4 3 2 1
8 7 6 5 4 3 2 1 12345674
12345678 12345678
1 2 3 4 5 6 7 8
8 7 6 5 4 3 2 1
R15 1 2 3 4 5 6 7 4 R15
x x x x x x x x
Memory Memory
Before execution After execution
Instruction bit pattern : 0001 0111 0000 0011