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X下面的操作是什么?
X
ldiw X, RAMTOP
ldiw被定义为宏,取 2 个参数。
ldiw
它是由两个基址寄存器组成的 16 位寄存器的简写:
X,Y,Z:间接地址寄存器 (X=R27:R26,Y=R29:R28 和 Z=R31:R30)
X,Y,Z:间接地址寄存器
(X=R27:R26,Y=R29:R28 和 Z=R31:R30)