X28HC64 Xicor, X28HC64 Datasheet - Page 4

• Manufacturer Part Number: X28HC64
• Description: 5 Volt/ Byte Alterable E2PROM
• Manufacturer: Xicor

X28HC64
DATA POLLING I/O
Figure 2. DATA Polling Bus Sequence
Figure 3. DATA Polling Software Flow
A 0 –A 12
I/O 7
WE
OE
CE
SAVE LAST DATA
AND ADDRESS
WRITE
LAST
WRITE DATA
COMPLETE?
COMPARE?
READ LAST
ADDRESS
V IH
An
WRITES
READY
7
IO 7
YES
YES
An
NO
HIGH Z
NO
An
3857 FHD F13
V OL
An
4
DATA Polling can effectively reduce the time for writing
to the X28HC64. 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
X28HC64
READY
3857 FHD F12