X88064 Datasheet, PDF (6/15 Pages) Xicor Inc. – E2 Micro-Peripheral

X88064
TOGGLE BIT POLLING
Because the X88064 typical nonvolatile write cycle time
is less than the specified 5ms, Toggle Bit Polling has
been provided to determine the early completion of write.
During the internal programming cycle I/O₆ will toggle
from HIGH to LOW and LOW to HIGH on subsequent
attempts to read the device. When the internal cycle is
complete, the toggling will cease and the device will be
accessible for additional read or write operations.
Toggle Bit Polling RD/WR Control
OPERATION
LAST BYTE •
WRITTEN
CE
I/O6=X
ALE
A/D₀ –A/D₇
A₈ –A₁₂
AIN _{D IN}
A12=n
AIN _DOUT
A12=n
WR
RD
I/O6=X
AIN _DOUT
A12=n
Symbol Table
WAVEFORM INPUTS
OUTPUTS
Must be
steady
May change
from LOW
to HIGH
May change
from HIGH
to LOW
Don’t Care:
Changes
Allowed
N/A
Will be
steady
Will change
from LOW
to HIGH
Will change
from HIGH
to LOW
Changing:
State Not
Known
Center Line
is High
Impedance
I/O6=X
AIN _DOUT
A12=n
I/O6=X
X88064 READ Y FOR
NEXT OPERATION
AIN _{D OUT}
A12=n
AIN
ADDR
7023 FRM F05
6