X28HC256D-12 XICOR [Xicor Inc.], X28HC256D-12 Datasheet - Page 4

• Manufacturer Part Number: X28HC256D-12
• Description: 5 Volt, Byte Alterable E2PROM
• Manufacturer: XICOR [Xicor Inc.]

X28HC256
DATA POLLING I/O
Figure 2. DATA Polling Bus Sequence
Figure 3. DATA Polling Software Flow
A 0 –A 14
I/O 7
WE
OE
CE
WRITE
SAVE LAST DATA
LAST
AND ADDRESS
WRITE DATA
COMPLETE?
V IH
An
READ LAST
COMPARE?
ADDRESS
X28HC256
WRITES
READY
7
IO 7
YES
YES
An
NO
HIGH Z
NO
An
3859 FHD F13
V OL
An
4
DATA Polling can effectively halve the time for writing to
the X28HC256. The timing diagram in Figure 2 illus-
trates the sequence of events on the bus. The software
flow diagram in Figure 3 illustrates one method of
implementing the routine.
An
An
An
V OH
X28HC256
READY
3859 FHD F12