ZiLOG eZ80 User Manual page 376

TSTIO n
Test I/O Byte
Operation
{0000h, C} AND n
Description
The CPU places the contents of the C register onto the lower byte of the address bus,
ADDR[7:0], while it forces the two upper bytes of the address bus, ADDR[23:0], to 0s.
The data at this I/O address {
n. The appropriate flags are set to 1, depending on the result of the AND logical operation.
Condition Bits Affected
S
Z
H
P/V
N
C
Attributes
Mnemonic Operand
TSTIO
UM007714-0908
0000h
Set if result is negative; reset otherwise.
Set if result is 0; reset otherwise.
Set.
Set if parity is even; reset otherwise.
Reset.
Reset.
ADL Mode Cycle Opcode (hex)
X
n
, C}, is bitwise ANDed with the 8-bit immediate value
4
ED, 74, nn
®
eZ80 CPU
User Manual
367
CPU Instruction Set