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20.11.5 Auto-Erase Mode
1. Auto-erase mode supports only entire memory erasing.
2. Do not perform a command write during auto-erasing.
3. Confirm normal end of auto-erasing by checking I/O6. Alternatively, status read mode can also
be used for this purpose (I/O7 status polling uses the auto-erase operation end decision pin).
4. Status polling I/O6 and I/O7 pin information is retained until the next command write. As long
as the next command write has not been performed, reading is possible by enabling CE and
OE.
Table 20-16 AC Characteristics in Auto-Erase Mode (Conditions: V
V
= 0 V, T
SS
Item
Command write cycle
CE hold time
CE setup time
Data hold time
Data setup time
Write pulse width
Status polling start time
Status polling access time
Memory erase time
Erase setup time
Erase end setup time
WE rise time
WE fall time
704
= 25°C ±5°C)
a
Symbol
t
nxtc
t
ceh
t
ces
t
dh
t
ds
t
wep
t
ests
t
spa
t
erase
t
ens
t
enh
t
r
t
f
CC
Min
Max
20
—
0
—
0
—
50
—
50
—
70
—
1
—
—
150
100
40000
100
—
100
—
—
30
—
30
= 5.0 V ±0.5 V,
Unit
µs
ns
ns
ns
ns
ns
ms
ns
ms
ns
ns
ns
ns
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