X28HC256DI-12 INTERSIL [Intersil Corporation], X28HC256DI-12 Datasheet - Page 6

• Manufacturer Part Number: X28HC256DI-12
• Description: 5 Volt, Byte Alterable EEPROM
• Manufacturer: INTERSIL [Intersil Corporation]

DATA POLLING I/O
Figure 2. DATA Polling Bus Sequence
Figure 3. DATA Polling Software Flow
A
0
–A
I/O
WE
OE
CE
14
7
Write
Last
Save Last Data
and Address
V
An
Complete?
X28HC256
Read Last
Write Data
Compare?
IH
Address
Writes
Ready
7
IO
7
Yes
Yes
6
An
No
HIGH Z
No
An
V
OL
An
X28HC256
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 soft-
ware flow diagram in Figure 3 illustrates one method
of implementing the routine.
An
An
An
V
X28HC256
Ready
OH
May 17, 2006
FN8108.1