ZiLOG Z8 - Z8 IO Ports and Configurations; Overview of Z8 IO Ports

COM dst
Instruction for.at:
Cycles
ope
(Hex)
COM
Complement
Address Hade
dst
~ ______ o_P_C ______ ~1 I~ ______ d_s_t ______ -J
6
60
61
R
IR
Operation:
Flags:
EX8lllple:
Note:
dst <-- NOT dst
The contents of the destination location are complemented (one's complement); all 1
bits are changed to 0, and vice-versa.
C: Unaffected
Z: Set if the result is zero; cleared otherwise
V: Always reset to 0
5: Set if result bit 7 is set; cleared otherwise
H: Unaffected
D: Unaffected
If working register B contains %24 (00100100), the statement
COM RB
leaves the value %DB (11011011) in that register. The Z and V flags are cleared and
the S flag is set.
When used to specify a 4-bit working-register address, address modes R or IR use the
format:
E dst
5-13