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735
22.11.5
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 output uses the auto-erase operation end identification
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 22.17 AC Characteristics in Auto-Erase Mode (Conditions: V
CC
= 5.0 V ±10%,
V
SS
= 0 V, T
a
= 25°C ±5°C)
Item
Symbol
Min
Max
Unit
Notes
Command write cycle
t
nxtc
20
µs
CE
hold time
t
ceh
0
ns
CE
setup time
t
ces
0
ns
Data hold time
t
dh
50
ns
Data setup time
t
ds
50
ns
Write pulse width
t
wep
70
ns
Status polling start time
t
ests
1
ms
Status polling access time
t
spa
150
ns
Memory erase time
t
erase
100
40000
ms
Erase setup time
t
ens
100
ns
Erase end setup time
t
enh
100
ns
WE
rise time
t
r
30
ns
WE
fall time
t
f
30
ns
Содержание SH7041 Series
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Страница 923: ...SH7040 SH7041 SH7042 SH7043 SH7044 SH7045 Group Hardware Manual REJ09B0044 0600O ...