|
| |
Input from Port
|
86/88 |
Y |
186 |
Y |
286 |
Y |
386 |
Y |
486 |
Y |
IN accumulator, port |
|
Ovfl |
N |
Dir |
N |
Int |
N |
Trap |
N |
Sign |
N |
Zero |
N |
Aux |
N |
Prty |
N |
Carry |
N |
IN transfers a byte or a word from a port to AL or AX. The port may be
specified by an immediate byte value (for ports 0 through 255) or by
the DX register (allowing access to all ports).
Note: It is advised that hardware not use I/O ports F8h
through FFh, since these are reserved for
controlling the math coprocessor and future
processor extensions.
------------------------------------ Timing ----------------------------------
OpCode Instruction 386 286 86
E4 IN AL, imm8 12 5 8
E5 IN AX, imm8 12 5 8
E5 IN EAX, imm8 12
EC IN AL, DX 13 5 8
ED IN AX, DX 13 5 8
ED IN EAX, DX 13
------------------------------------ Logic -----------------------------------
accumulator = (port)
See Also INS OUTS OUT |