6. ROM
Rev.3.00 Jul. 19, 2007 page 161 of 532
REJ09B0397-0300
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
6
. Alternatively, status read mode can also
be used for this purpose (the FO
7
status polling pin is used to identify the end of an auto-erase
operation).
4. Status polling FO
6
and FO
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
.
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
(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
⎯
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
OE
output delay time
t
oe
⎯
150
ns
Disable delay time
t
df
⎯
100
ns
CE
output delay time
t
ce
⎯
150
ns
WE
rise time
t
r
⎯
30 ns
WE
fall time
t
f
⎯
30 ns
Summary of Contents for F-ZTAT H8 Series
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Page 194: ...7 RAM Rev 3 00 Jul 19 2007 page 168 of 532 REJ09B0397 0300...
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