out

Operands

out (nn),r | out nn,r | out (rr),r | out (rr),0

The value of A is written to the port whose address is formed by A in the high bits and nn in the low bits.

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

Instruction	Description	Flags	Bytes	Cycles
out (nn),a	The value of A is written to the port whose address is formed by A in the high bits and `nn` in the low bits.	—	2	11
out (c),b	The value of B is written to the port at the 16-bit address contained in the BC register pair.	—	2	12
out (c),c	The value of C is written to the port at the 16-bit address contained in the BC register pair.	—	2	12
out (c),d	The value of D is written to the port at the 16-bit address contained in the BC register pair.	—	2	12
out (c),e	The value of E is written to the port at the 16-bit address contained in the BC register pair.	—	2	12
out (c),h	The value of H is written to the port at the 16-bit address contained in the BC register pair.	—	2	12
out (c),l	The value of L is written to the port at the 16-bit address contained in the BC register pair.	—	2	12
out (c),0 undocumented	Outputs a zero (on NMOS Z80s) or 255 (on CMOS Z80s) to the port at the 16-bit address contained in the BC register pair. Read More	—	2	12
out (c),a	The value of A is written to the port at the 16-bit address contained in the BC register pair.	—	2	12