- #1
kelvin56484984
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Homework Statement
Find the carrry flag,overflow flag, set flag after these instructions
A=68H -100
B=-12+A
C=B-33H
D=C+53H
Homework Equations
The Attempt at a Solution
I change the value to binary
A
68H--------->1101000
100---------->1100100
1101000
- 1100100
0000100
B
12---------->1100
After 2s complement
-12---------->11110100
11110100
+ 00000100
11111000
C
33H---------->110011
11111000
- 00110011
11000101
D
53H---------->1010011
11000101
+ 01010011
101001000So the carry flag is 1 ,
then 68H=104, 33H=51, 53H=83
{[-12+(104-100)]-51}+83
=24
Since the sign bit is 1 ,it is overflow
the overflow flag is 1
But how to find Set flag?