4.6.寄存器与内存
\(4.6.\)Working with register and memory
1.Operations towards D
Storing value: It turns out that there's no direct way to do it, we have to do it indirectly. For example, if we want to store 10 in register D:
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2@10
D = AIncresing value: We can use C instructions directly:
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D = D + 1
Setting D to RAM value: It's similar to storing value:
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2@10
D = M
2.Usage of D register
D register is of great importance in assignment operations:
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11//set RAM[10] to 5
@5
D = A
@10
M = D
//set RAM[10] to RAM[5]
@ 5
D = M
@10
M = D