Article From:https://segmentfault.com/q/1010000011118125
Question:

RTAs shown in Figure fourth, what are the data and alpha in the fifth instructions? The book is not clear, and he can not understand his example. Who can explain it? The title of the second edition of microcomputer principle is Wang Zhongmin.

Answer 0:

Why don’t you ask MEM what it is?

These are custom tags, equivalent to the variable names in the high-level language.

Look at it first, and the back will come.

Answer 1:

Is the name of the variable that you define in the DATAS data paragraph.

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