Rev. 2.0, 11/00, page 162 of 1037
7.8.6
Auto-Erase Mode
(a) Auto-erase mode supports only entire memory erasing.
(b) Do not perform a command write during auto-erasing.
(c) Confirm normal end of auto-erasing by checking FO6. Alternatively, status read mode can
also be used for this purpose (FO7 status polling uses the auto-erase operation end
identification pin).
(d) The status polling FO6 and FO7 pin information is retained until the next command write.
Until the next command write is performed, reading is possible by enabling
&( and 2(.
Table 7.16 AC Characteristics in Auto-Erase Mode
(Conditions: V
CC
= 5.0 V
±
10%, V
SS
= 0 V, Ta = 25
°
C
±
5
°
C)
Item
Symbol
Min
Max
Unit
Command write cycle
t
nxtc
20
µ
s
&(
hold time
t
ceh
0
ns
&(
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
:(
rise time
t
r
30
ns
:(
fall time
t
f
30
ns
Erase setup time
t
ens
100
ns
Erase end setup time
t
enh
100
ns
Содержание Hitachi H8S/2191
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