ZiLOG Z8 - CounterTimer Operation Modes

",
SWAP dst
Instruction For.at:
OPC
Operation:
Flags:
Exmaple:
Note:
SWAP
Swap Nibbles
OPC
Address Mode
Cycles
(Hex)
dst
I
I
dst
B ro R
B F1
IR
dst(O - 3) <--> dst(4 - 7)
The contents of the lower four bits and upper four bits of the destination operand
are swapped.
C: Undefined
Z: Set if the result is zero; cleared otherwise
V: Undefined
S: Set if the result bit 7 is set; cleared otherwise
H: Unaffected
0: Unaffected
Suppose
the register named BCD_nperands contains ~B3 (10110011). The statement
SWAP BCD_Operands
will leave the value %38 (00111011) in the register. The Z and S flags are cleared.
When used to specify a 4-bit working-register address, address modes R or IR use the
format:
E dst
5-47