Zilog EZ80F916 - Manual (Page 376)

eZ80
®
CPU
User Manual
UM007715-0415 CPU Instruction Set
367
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 {
0000h
, C}, is bitwise ANDed with the 8-bit immediate value
n
. The appropriate flags are set to 1, depending on the result of the AND logical operation.
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)
TSTIO n
X 4
ED, 74, nn