in

Operands

in r,(nn) | in r,nn | in r,(rr) | in (rr)

A byte from the port whose address is formed by A in the high bits and nn in the low bits is written to A.

Every form of in the assembler accepts. The cycles column counts clock cycles, written as taken/not taken for the conditional forms.

Instruction	Description	Flags	Bytes	Cycles
in a,(nn)	A byte from the port whose address is formed by A in the high bits and `nn` in the low bits is written to A.	—	2	11
in b,(c)	A byte from the port at the 16-bit address contained in the BC register pair is written to B.	N=0P/V=PH=0ZS	2	12
in c,(c)	A byte from the port at the 16-bit address contained in the BC register pair is written to C.	N=0P/V=PH=0ZS	2	12
in d,(c)	A byte from the port at the 16-bit address contained in the BC register pair is written to D.	N=0P/V=PH=0ZS	2	12
in e,(c)	A byte from the port at the 16-bit address contained in the BC register pair is written to E.	N=0P/V=PH=0ZS	2	12
in h,(c)	A byte from the port at the 16-bit address contained in the BC register pair is written to H.	N=0P/V=PH=0ZS	2	12
in l,(c)	A byte from the port at the 16-bit address contained in the BC register pair is written to L.	N=0P/V=PH=0ZS	2	12
in (c) undocumented	Inputs a byte from the port at the 16-bit address contained in the BC register pair and affects flags only.	N=0P/V=PH=0ZS	2	12
in a,(c)	A byte from the port at the 16-bit address contained in the BC register pair is written to A.	N=0P/V=PH=0ZS	2	12