|
| |
Load Register AH from Flags
|
86/88 |
Y |
186 |
Y |
286 |
Y |
386 |
Y |
486 |
Y |
LAHF |
|
Ovfl |
N |
Dir |
N |
Int |
N |
Trap |
N |
Sign |
N |
Zero |
N |
Aux |
N |
Prty |
N |
Carry |
N |
LAHF copies the five 8080/8085 flags (Sign, Zero, Auxiliary Carry,
Parity, and Carry) into bits 7, 6, 4, 2, and 0, respectively, of the
AH register. The flags themselves are unchanged by this instruction.
Notes: This instruction is primarily used to provide upward
compatibility between the 8080/8085 family and the
8086 family.
After this instruction is executed, bits 1, 3 and 5
of AH are undefined.
------------------------------------ Timing ----------------------------------
OpCode Instruction 386 286 86
9F LAHF 2 2 4
------------------------------------ Logic -----------------------------------
AH Bits <--- Flags
7 6 4 2 0 S Z A P C
See Also SAHF PUSHF POPF Flags |