ADD - Z80 instruction reference

SZHP/VNC ●●●●0●

● set from the result
0 always 0

The rows that do otherwise show their own flags.

Forms

add a, 1 byte · 4 cycles

Adds r to A.
add a, 1 byte · 7 cycles

Adds (HL) to A.
add a, 2 bytes · 7 cycles

Adds nn to A.
add a, 3 bytes · 19 cycles

Adds the value pointed to by IX plus dd to A.
add hl, 1 byte · 11 cycles H●N0C●

The value of rr is added to HL.
add , 2 bytes · 15 cycles rr: bc de sp H●N0C●

The value of rr is added to IX.
add , 2 bytes · 15 cycles H●N0C●

The value of IX is added to IX.

Pseudo-instructions

Other spellings the assembler accepts; each form shows the instruction it becomes.

add 1 byte · 4 cycles

Adds r to A.
add 1 byte · 7 cycles

Adds (HL) to A.
add 2 bytes · 7 cycles

Adds nn to A.
add 3 bytes · 19 cycles

Adds the value pointed to by IX plus dd to A.

Undocumented 1 row

Left out of Zilog's manual, but the Z80 runs them, and so does this emulator.

add a, 2 bytes · 8 cycles

Adds ixh/l to A.

Pseudo-instructions · Undocumented 1 row

Other spellings the assembler accepts; each form shows the instruction it becomes. Left out of Zilog's manual, but the Z80 runs them, and so does this emulator.

add 2 bytes · 8 cycles

Adds ixh/l to A.

Operands

r: An 8-bit register: a, b, c, d, e, h or l.
(hl): The byte in memory at the address stored in hl. More
nn: An 8-bit immediate value, 0 to 255 or -128 to 127, written as a number, character constant or symbol. More
(ix+dd): The byte in memory at ix + dd, where dd is a signed displacement from -128 to 127, for example (ix+5) or (ix-3). (iy+dd) works the same way. More
rr: A register pair: bc, de, hl or sp.
ix: The ix index register. You can also use iy, with the same instruction size and timing. More
ixh/l: The high or low byte of ix: ixh or ixl. For iy, use iyh or iyl. More

        .org 0x8000
        ld a, 5
        ld hl, 0x9000
        ld bc, 0x0234
        add hl, bc
        halt1
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