Zilog Z08470 - Manual (Page 65)

UM008007-0715 Bit Manipulation
Z80 CPU
User Manual
53
Bit Manipulation
The ability to set, reset, and test individual bits in a register or memory location is required
in almost every program. These bits can be flags in a general-purpose software routine,
indications of external control conditions, or data packed into memory locations, making
memory utilization more efficient.
With a single instruction, the Z80 CPU can set, reset, or test any bit in the Accumulator, in
any general-purpose register, or in any memory location. Table 13 lists the 240 instruc-
tions that are available for this purpose.
Table 13. Bit Manipulation Group
Register Addressing
Register
Indirect Indexed
A 8 C D E H L (HL) (IX+d) (IY+d)
Bit DD FD
Test Bit
0
C8 C8 C8 C8 C8 C8 C8 C8 C8 C8
47 40 41 42 43 44 45 46 d d
1
46 46
DD FD
C8 C8 C8 C8 C8 C8 C8 C8 C8 C8
4F 48 49 4A 48 4C 4D 4E d d
4E 4E
2
DD FD
C8 C8 C8 C8 C8 C8 C8 C8 C8 C8
57 50 51 52 53 54 55 56 d d
56 56
3
DD FD
C8 C8 C8 C8 C8 C8 C8 C8 C8 C8
5F 58 59 5A 5B 5C 5D 5E d d
46 46
4
DD FD
C8 C8 C8 C8 C8 C8 C8 C8 C8 C8
67 60 61 62 63 64 65 66 d d
66 66
5
DD FD
C8 C8 C8 C8 C8 C8 C8 C8 C8 C8
6F 68 69 6A 68 6C 6D 6E d d
6E 6E