...
[x]补 =1001 0011b
[-y]补 =1101 0011b (+
----------------------------------------
[x-y]补 =0110 0110b
Cs♁Cp = 1♁0 = 1 ,负溢出
(Cs是符号位的进位,Cp是最高数值位的进位,♁表示异或)
[x-y]反 = -0110 0101b
[x-y]原 = -1001 1010b
x -y = -1001 1010b = -154d
...
[x]补 =1001 0011b
[-y]补 =1101 0011b (+
----------------------------------------
[x-y]补 =0110 0110b
Cs♁Cp = 1♁0 = 1 ,负溢出
(Cs是符号位的进位,Cp是最高数值位的进位,♁表示异或)
[x-y]反 = -0110 0101b
[x-y]原 = -1001 1010b
x -y = -1001 1010b = -154d