sh-dis/sh4/STS.L PR,@-Rn

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0100nnnn00100010
pr ← SignExtend32(PR’);
op1 ← SignExtend32(Rn);
address ← ZeroExtend32(op1 - 4);
WriteMemory32(address, pr);
op1 ← address;
Rn ← Register(op1);