X28HC256DM-12 View Datasheet(PDF) - Rochester Electronics
Part Name
Description
MFG CO.
'X28HC256DM-12' PDF : 21 Pages View PDF
DATA Polling I/O7
LAST
WE WRITE
X28HC256
CE
OE
VIH
I/O7
A0 TO A14
An
HIGH Z
VOL
An
An
An
An
An
FIGURE 2. DATA POLLING BUS SEQUENCE
VOH
X28HC256
READY
An
WRITE DATA
DATA Polling can effectively halve the time for writing to the
X28HC256. 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.
WRITES
NO
COMPLETE?
YES
SAVE LAST DATA
AND ADDRESS
READ LAST
ADDRESS
IO7
NO
COMPARE?
YES
X28HC256
READY
FIGURE 3. DATA POLLING SOFTWARE FLOW
6
FN8108.2
May 7, 2007
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