19.22.6 Auto-Erase Mode - Renesas H8S Series Hardware Manual

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
(the I/O status polling pin is used to identify the end of an auto-erase operation).
7
• Status polling I/O
and I/O
6
write has not been performed, reading is possible by enabling CE and OE.
AC Characteristics
Table 19-46 AC Characteristics in Auto-Erase Mode
= 5.0 V ±10%, V
Conditions: V
CC
Item
Command write cycle
CE hold time
CE setup time
Data hold time
Data setup time
Write pulse width
Status polling start time
Status polling access time
Memory erase time
WE rise time
WE fall time
A to A
18 0
CE
OE
WE
I/O
7
I/O
6
I/O to I/O
5 0
pin information is retained until the next command write. As long as the next command
7
= 25°C ±5°C
= 0 V, T
SS a
Symbol
t
nxtc
t
ceh
t
ces
t
dh
t
ds
t
wep
t
ests
t
spa
t
erase
t
r
t
f
t
t t
ces ceh nxtc
t
wep
t t
f r
t t
ds dh
H'20
Figure 19-60 Auto-Erase Mode Timing Waveforms
. Alternatively, status read mode can also be used for this purpose
6
Min Max
20 —
0 —
0 —
50 —
50 —
70 —
1 —
— 150
100 40000
— 30
— 30
t
t
spa
ests
t
erase
Erase end identifi-
cation signal
Erase normal end
confirmation signal
H'20
Unit
µs
ns
ns
ns
ns
ns
ms
ns
ms
ns
ns
t
nxtc
H'00
Rev.6.00 Oct.28.2004 page 655 of 1016
REJ09B0138-0600H