IN
Reads a value from a hardware port.
Syntax
in op8,(op8)
Allowed Instructions
in a,(n) ;8-bit constant
in a,(c)
in b,(c)
in c,(c)
in d,(c)
in e,(c)
in h,(c)
in l,(c)
in (c) ;undocumented command
Effects
IN A,(N)
This command alters no flags.
Others
N flag reset, P/V represents parity, C flag preserved, all other flags affected by definition.
Uses
This command, along with OUT, is used for hardware interfacing.
The undocumented command IN (C) reads from the port and affects flags, but does not store the value to a register.
T-States
r denotes 8-bit register.
A, X | 11 |
r, (C) | 12 |
See Also
page revision: 3, last edited: 17 Dec 2014 17:57