Datasheet

Section 19 ROM
Rev.6.00 Sep. 27, 2007 Page 786 of 1268
REJ09B0220-0600
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 19.26 Auto-Erase Mode Timing Waveforms
19.11.7 Status Read Mode
• 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.
• The return code is retained until a command write for other than status read mode is
performed.
Table 19.21 AC Characteristics in Status Read Mode
Conditions: V
CC
= 3.3 V ±0.3 V, V
SS
= 0 V, T
a
= 25°C ±5°C
Item Symbol Min Max Unit
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
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