
UM008007-0715 Z80 Instruction Description
Z80 CPU
User Manual
201
DEC IY
Operation
IY ← IY– 1
Op Code
DEC
Operand
IY
Description
The contents of Index Register IY are decremented.
Condition Bits Affected
None.
Example
If Index Register IY contains 7649h, then upon the execution of a DEC IY instruction,
Index Register IY contains
7648h.
M Cycles T States 4 MHz E.T.
2 10 (4, 6) 2.50
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