UPD703100 Datasheet, PDF (66/185 Pages) NEC – 32-Bit Single-Chip Microcontrollers

Remark
CHAPTER 5 INSTRUCTIONS
General-purpose registers in list12 are loaded in the downward direction. (r31, r30, ... r20)
The 5-bit immediate imm5 is used to restore a stack frame for auto variables and temporary
data.
The lower 2 bits of the address specified by sp are always masked by 0 even if misalign
access is enabled.
If an interrupt occurs while this instruction is being executed, execution is aborted, and the
interrupt is processed. Upon returning from the interrupt, execution is restarted. Also, sp will
retain its original value prior to the start of execution.
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User’s Manual U12197EJ6V0UM