Opcodes

Instruction Set

Instruction Notation Summary

Notation	Description
r	Identifies any of the registers A, B, C, D, E, H or L
(HL)	Identifies the contents of the memory location whose address is specified by the contents of the HL register pair.
(IX + d)	Identifies the contents of the memory location, whose address is specified by the contents of the Index register pair IX plus the signed displacement d
(IY + d)	Identifies the contents of the memory location, whose address is specified by the contents of the Index register pair IY plus the signed displacement d
n	Identifies a one-byte unsigned integer expression in the range (0 to 255)
nn	Identifies a two-byte unsigned integer expression in the range (0 to 65535) (0x0000 to 0xFFFF)
b	Identifies a one-byte signed integer expression in the range (-128 to +127)
e	Identifies a one-byte signed integer expression in the range (-126 to +129) for relative jump offset from current location
cc	Identifies the status of the Flag Register as any of ( NZ, Z, NC, C, PO, PE, P or M ) for the conditional jumps, calls, and return instructions
qq	Identifies any of the register pairs BC, DE, HL or AF
ss	Identifies any of the register pairs BC, DE, HL or SP
pp	Identifies any of the register pairs BC, DE, IX or SP
rr	Identifies any of the register pairs BC, DE, IY or SP
s	Identifies any of r, n, (HL), (IX+d) or (IY+d)
m	Identifies any of r, (HL), (IX+d) or (IY+d)