XM28C020 Просмотр технического описания (PDF) - Xicor -> Intersil
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XM28C020 Datasheet PDF : 16 Pages
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XM28C020
RESETTING SOFTWARE DATA PROTECTION
Figure 8. Reset Software Data Protection Timing Sequence
VCC
DATA AA
ADDRESS 5555
A0–A15*
CE
55
2AAA
80
5555
AA
5555
55
2AAA
20
5555
≥tWC
STANDARD
OPERATING
MODE
WE
*A16 & A17 select one of four devices on the module.
3872 FHD F16
Figure 9. Software Sequence to Deactivate
Software Data Protection
WRITE DATA AA
TO ADDRESS
5555
In the event the user wants to deactivate the software
data protection feature for testing or reprogramming in
an E2PROM programmer, the following six step algo-
rithm will reset the internal protection circuit. After tWC,
the device will be in standard operating mode.
WRITE DATA 55
TO ADDRESS
2AAA
WRITE DATA 80
TO ADDRESS
5555
WRITE DATA AA
TO ADDRESS
5555
WRITE DATA 55
TO ADDRESS
2AAA
WRITE DATA 20
TO ADDRESS
5555
3872 FHD F17
SYMBOL TABLE
WAVEFORM INPUTS
OUTPUTS
Must be
steady
May change
from LOW
to HIGH
May change
from HIGH
to LOW
Don’t Care:
Changes
Allowed
N/A
Will be
steady
Will change
from LOW
to HIGH
Will change
from HIGH
to LOW
Changing:
State Not
Known
Center Line
is High
Impedance
8
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