eZ80
®
CPU
User Manual
UM007714-0908 CPU Instruction Set
106
Bit b, (HL)
Bit Test
Operation
Z ← ~(HL)[b]
Description
The (HL) operand is an 8-bit value stored at the memory location specified by the contents
of the multibyte register HL. This instruction tests bit
b
of this 8-bit value and sets the 0
Flag (Z) if the bit is 0. The Z Flag is reset if bit
b
of operand (HL) is a one.
Condition Bits Affected
Attributes
kk = binary code 01 bbb 110, where bbb identifies the bit tested and assembled into the
object code, as indicated in Table 44.
S Undefined.
Z Set if bit b is 0; reset otherwise.
H Set.
P/V Undefined.
N Reset.
C Not affected.
Mnemonic Operand ADL Mode Cycle Opcode (hex)
BIT b,(HL) X 3 CB, kk
BIT.S b,(HL) 1 4 52, CB, kk
BIT.L b,(HL) 0 4 49, CB, kk
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