Datasheet

Section 19 ROM
Rev.6.00 Sep. 27, 2007 Page 785 of 1268
REJ09B0220-0600
19.11.6 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 19.20 AC Characteristics in Auto-Erase 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
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