eZ80
®
CPU
User Manual
UM007714-0908 CPU Instruction Set
289
RES b, (IX/Y+d)
Reset Bit
Operation
(IX/Y+d)[b] ← 0
Description
The (
IX/Y
+
d
) operand is an 8-bit value at the memory location specified by the contents
of the Index Register, IX or IY, added to the two’s-complement displacement
d
. Bit
b
of
this value is reset to 0.
Condition Bits Affected
None.
Attributes
kk = binary code 10 bbb 110; where bbb identifies the bit tested and is assembled into
the object code as indicated in Table 81.
Mnemonic Operand ADL Mode Cycle Opcode (hex)
RES b,(IX+d)X 5 DD, CB, dd, kk
RES.S b,(IX+d)1 6 52, DD, CB, dd, kk
RES.L b,(IX+d)0 6 49, DD, CB, dd, kk
RES b,(IY+d)X 5 FD, CB, dd, kk
RES.S b,(IY+d)1 6 52, FD, CB, dd, kk
RES.L b,(IY+d)0 6 49, FD, CB, dd, kk
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