FUJITSU FR family 32-bit microcontroller instruction manuel CM71-00101-5E - Manual (Page 194)

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CHAPTER 7 DETAILED EXECUTION INSTRUCTIONS
7.74 ST (Store Word Data in Register to Memory)
Subtracts 4 from the value of "R15", stores the word data in dedicated register "Rs" to
the memory address indicated by the new value of "R15".
If a non-existent dedicated register is given as "Rs", undefined data will be transferred.
■
ST (Store Word Data in Register to Memory)
Assembler format: ST Rs, @ – R15
Operation: R15 – 4
→
R15
Rs
→
(R15)
Flag change:
N, Z, V, and C: Unchanged
Execution cycles: a cycle(s)
Instruction format:
Example: ST MDH, @ – R15
N Z V C
– – – –
MSB LSB
0 0 0 1 0 1 1 1 1 0 0 0 Rs
12345670
R15 R15
8 7 6 5 4 3 2 1
8 7 6 5 4 3 2 1
12345670
12345674 12345674
1 2 3 4 5 6 7 8
8 7 6 5 4 3 2 1 MDH
1 2 3 4 5 6 7 4
MDH
x x x x x x x x
Memory Memory
Before execution After execution
Instruction bit pattern : 0001 0111 1000 0100