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X28HC256PM-12 Datasheet(PDF) 7 Page - Rochester Electronics

Part # X28HC256PM-12
Description  LOW POWER CMOS EEPROM with hi-speed page write capability 256K EEPROM
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Manufacturer  ROCHESTER [Rochester Electronics]
Direct Link  http://www.rocelec.com/
Logo ROCHESTER - Rochester Electronics

X28HC256PM-12 Datasheet(HTML) 7 Page - Rochester Electronics

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6
FN8108.2
May 7, 2007
DATA Polling I/O7
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.
CE
OE
WE
I/O7
X28HC256
READY
LAST
WRITE
HIGH Z
VOL
VIH
A0 TO A14
An
An
An
An
An
An
VOH
An
FIGURE 2. DATA POLLING BUS SEQUENCE
WRITE DATA
SAVE LAST DATA
AND ADDRESS
READ LAST
ADDRESS
IO7
COMPARE?
X28HC256
NO
YES
WRITES
COMPLETE?
NO
YES
READY
FIGURE 3. DATA POLLING SOFTWARE FLOW
X28HC256


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