Zilog Z08470 - Manual (Page 256)

Z80 Instruction Set UM008007-0715
244
Z80 CPU
User Manual
Z is set if specified bit is 0; otherwise, it is reset.
H is set.
P/V is unknown.
H is reset.
C is not affected.
Example
If the HL register pair contains 4444h , and bit 4 in the memory location 444h contains 1,
then upon the execution of a BIT 4, (HL) instruction, the Z flag in the F Register contains
0, and bit 4 in memory location
4444h remains at 1. Bit 0 in memory location 4444h is
the least-significant bit.