![](https://csdnimg.cn/release/download_crawler_static/87078146/bg5.jpg)
例:
• 设(A)= 84H,(30H)=8DH
ADD A,30H
• 则(A)=11H ;(CY)= 1; (AC)= 1;
(OV)= 1; (P)= 0
分析:
• 当作为无符号数时:84H=132,8DH=141
84H+8DH = 273 > 256 则(CY)=1
• 当作为有符号数时:84H = -124, 8DH = -
115
其和为-239,超出-128~+127,
故溢出(OV)=1。
事实上,两个负数相加,其结果(A)=11H=
17为正数,不合理,必然溢出。
11/19/2022 5
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