Fujitsu MB90390 Series Hardware Manual page 190

CHAPTER 8 LOW-POWER CONTROL CIRCUIT
(3) Define the standby mode transition instruction between #pragma asm and #pragma endasm and
insert two NOP and JMP instructions after that instruction.
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Example: Transition to stop mode
#pragma asm
MOV I:_IO_LPMCR, #H'98
NOP
NOP
JMP $+3
#pragma endasm
/* Set LPMCR STP bit to "1" */
/* Jump to next instruction */;