eZ80
®
CPU
User Manual
UM007714-0908 CPU Instruction Set
364
TST A, n
Test
Operation
A AND n
Description
The 8-bit immediate value
n
is bitwise ANDed with the contents of the accumulator, A.
The appropriate flags are set to 1, depending on the result of the
AND
logical operation.
The contents of the accumulator are not altered.
Condition Bits Affected
Attributes
S Set if result is negative; reset otherwise.
Z Set if result is 0; reset otherwise.
H Set.
P/V Set if parity is even; reset otherwise.
N Reset.
C Reset
Mnemonic Operand ADL Mode Cycle Opcode (hex)
TST A,n X3ED, 64, nn