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PUSHF
POPF
2.2.1.2
Arithmetic Instructions
The arithmetic instructions (see Table 2-4) operate on four types of numbers:
•
Unsigned binary
•
Signed binary (integers)
•
Unsigned packed decimal
•
Unsigned unpacked decimal
OVERVIEW OF THE 80C186 FAMILY ARCHITECTURE
LAHF
SAHF
U
U
U
U
O
D
I
15
14
13
12
11
10
9
U = Undefined; Value is indeterminate
O = Overflow Flag
D = Direction Flag
I = Interrupt Enable Flag
T = Trap Flag
S = Sign Flag
Z = Zero Flag
A = Auxiliary Carry Flag
P = Parity Flag
C = Carry Flag
Figure 2-11. Flag Storage Format
S
Z U A U P U C
7
6 5 4 3 2 1 0
T
S
Z
U
A
U
P
8
7
6
5
4
3
2
U
C
1
0
A1014-0A
2-19
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