
Z80 Instruction Set UM008007-0715
256
Z80 CPU
User Manual
RES b, m
Operation
sb ← 0
Op Code
RES
Operands
b, m
The b operand represents any bit (7 through 0) of the contents of the m operand, (any of r,
(HL), (IX+d), or (lY+d)) as defined for the analogous SET instructions. These possible op
code/operand combinations are assembled as follows in the object code:
11 0 11001
CB
11 0 11001
CB
11 1 01101
DD
11 0 11001
CB
d
11 1 01111
FD
11 0 11001
CB
d
RES b, rn
RES b, (HL)
RES b, (IX+d)
RES b, (IY+d)
10 b 110
10 b 110
10 b
r
10 b 110
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