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390 FUJITSU MICROELECTRONICS LIMITED CM71-00105-1E
CHAPTER 7 DETAILED EXECUTION INSTRUCTIONS
7.155
7.155 ST (Store Word Data in Register to Memory)
Subtracts 4 from the value R15, stores the word data in dedicated register Rs to the
memory address indicated by the new value of R15.
● Assembler Format
ST Rs,@-R15
● Operation
R15 - 4 → R15
Rs → (R15)
If the number of a non-existent dedicated register is specified in parameter Rs, the read value will be
ignored.
● Flag Change
N, Z, V, C: Unchanged.
● Classification
Memory Store instruction, Instruction with delay slot
● Execution Cycles
a cycle
● Instruction Format
NZVC
----
MSB LSB
000101111000 Rs