X28HC64DI-12 INTERSIL [Intersil Corporation], X28HC64DI-12 Datasheet - Page 4

• Manufacturer Part Number: X28HC64DI-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
12
7
Write
Save Last Data
Last
and Address
V
An
Read Last
Complete?
Compare?
Write Data
Address
IH
Ready
Writes
7
IO
7
Yes
Yes
4
An
No
HIGH Z
No
An
V
OL
An
X28HC64
DATA Polling can effectively reduce the time for writ-
ing to the X28HC64. The timing diagram in Figure 2
illustrates 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
X28HC64
Ready
OH
June 1, 2005
FN8109.0