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- UID
- 72935
- 性别
- 男
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问一下ADDAB/ADDAH指令问题：
书上例子写着：ADDAB .D1 A4,A2,A4
执行前：A2=0000000BH,A4=00000100H,AMR=00020001H
执行后：A2=0000000BH,A4=00000103H,AMR=00020001H
ADDAH .D1 A4,A2,A4
执行前：A2=0000000BH,A4=00000100H,AMR=00000000H
执行后：A2=0000000BH,A4=00000106H,AMR=00000000H
为什么呀，小弟有点不明白？，特此请教！谢谢！ [em08] |
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