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Notes on Use of Auto-Erase Mode
1. Auto-erase mode supports only total memory erasing.
2. Do not perform a command write during auto-erasing.
3. Confirm normal end of auto-erasing by checking FO
be used for this purpose (the FO
operation).
4. Status polling FO
as the next command write has not been performed, reading is possible by enabling CE and
OE.
6.8.7
Status Read Mode
1. Status read mode is used to identify what type of abnormal end has occurred. Use this mode
when an abnormal end occurs in auto-program mode or auto-erase mode.
2. The return code is retained until a command write for other than status read mode is
performed.
Table 6.17 AC Characteristics in Status Read Mode
= 5.0 V ±10%, V
(Conditions: V
CC
Item
Command write cycle
CE hold time
CE setup time
Data hold time
Data setup time
Write pulse width
OE output delay time
Disable delay time
CE output delay time
WE rise time
WE fall time
status polling pin is used to identify the end of an auto-erase
7
and FO
pin information is retained until the next command write. As long
6
7
= 0 V, T
SS
Symbol
t
nxtc
t
ceh
t
ces
t
dh
t
ds
t
wep
t
oe
t
df
t
ce
t
r
t
f
. Alternatively, status read mode can also
6
= 25°C ±5°C)
a
Min
Max
⎯
20
⎯
0
⎯
0
⎯
50
⎯
50
⎯
70
⎯
150
⎯
100
⎯
150
⎯
30
⎯
30
Rev.3.00 Jul. 19, 2007 page 161 of 532
Unit
Notes
μs
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
REJ09B0397-0300
6. ROM
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