Rev.6.00 Oct.28.2004 page 655
of 1016
REJ09B0138-0600H
19.22.6
Auto-Erase Mode
•
Auto-erase mode supports only total memory erasing.
•
Do not perform a command write during auto-erasing.
•
Confirm normal end of auto-erasing by checking I/O
6
. Alternatively, status read mode can also be used for this purpose
(the I/O
7
status polling pin is used to identify the end of an auto-erase operation).
•
Status polling I/O
6
and I/O
7
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
.
AC Characteristics
Table 19-46 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
Command write cycle
t
nxtc
20
—
µ
s
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
WE
rise time
t
r
—
30
ns
WE
fall time
t
f
—
30
ns
CE
A
18
to A
0
I/O
5
to I/O
0
I/O
6
I/O
7
OE
WE
t
ests
t
erase
t
spa
t
dh
t
ds
t
f
t
r
t
wep
t
nxtc
t
nxtc
t
ceh
t
ces
Erase end identifi-
cation signal
Erase normal end
confirmation signal
H'20
H'20
H'00
Figure 19-60 Auto-Erase Mode Timing Waveforms
Содержание ZTAT H8S/2357F
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