题目内容

已知SP等于0x30001200，R4、R5、R6的值分别为0x127、0x138、0x149。试说明执行STMFD SP!, {R4-R6}指令后，SP、R4、R5、R6各寄存器和各存储单元的内容如何变化（按照小端存储法操作）。

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