ZiLOG eZ80 User Manual page 59

Indexed Addressing
In this mode of addressing, a byte of data following the opcode contains a displacement to
be added to one of the IX or IY Index registers. The displacement is a two's-complement
value in the range +127 to –128.
Index Register (IX or IY)
Extended Addressing
The memory operand address is specified by two or three bytes following the opcode.
ure 9 displays the extended addressing.
Relative Addressing
Relative addressing uses one byte of data following the opcode to specify a displacement
from the existing program to which a program jump can occur. The displacement is a
two's-complement number that is added to the address of the opcode following the
UM007714-0908
Op Code 1
Op Code 2
Displacement (d)
Figure 8. Indexed Addressing
Op Code
nn
mm
MM
{MM, mm, nn}
Figure 9. Extended Addressing
Figure 8 displays the indexed addressing.
+
Operand
Memory Space
Operand
Memory Space
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eZ80 CPU
User Manual
50
Fig-
Addressing Modes