sh-dis/sh4/MOV.B Rm,@-Rn

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0010nnnnmmmm0100
op1 ← SignExtend32(Rm);
op2 ← SignExtend32(Rn);
address ← ZeroExtend32(op2 - 1);
WriteMemory8(address, op1);
op2 ← address;
Rn ← Register(op2);