HD64F2357F20V Datasheet, PDF (685/1049 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-chip Microcomputer H8S Family / H8S/2300 Series

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/O₆. Alternatively, status read mode can also be used for this purpose
(the I/O₇ status polling pin is used to identify the end of an auto-erase operation).
• Status polling I/O₆ and I/O₇ 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 19-46 AC Characteristics in Auto-Erase Mode
Conditions: V_CC = 5.0 V ±10%, V_SS = 0 V, T_a = 25°C ±5°C
Item
Symbol
Min
Command write cycle
t _nxtc
20
CE hold time
t _ceh
0
CE setup time
t _ces
0
Data hold time
t _dh
50
Data setup time
t _ds
50
Write pulse width
t _wep
70
Status polling start time
t _ests
1
Status polling access time
t _spa
—
Memory erase time
t _erase
100
WE rise time
t_r
—
WE fall time
t_f
—
Max
Unit
—
µs
—
ns
—
ns
—
ns
—
ns
—
ns
—
ms
150
ns
40000
ms
30
ns
30
ns
A18 to A0
CE
OE
WE
I/O7
I/O6
I/O5 to I/O0
tces
tceh tnxtc
tnxtc
tf
twep _tr
tds
tdh
H'20
tests tspa
terase
Erase end identifi-
cation signal
Erase normal end
confirmation signal
H'20
H'00
Figure 19-60 Auto-Erase Mode Timing Waveforms
Rev.6.00 Oct.28.2004 page 655 of 1016
REJ09B0138-0600H