SH7014 Datasheet, PDF (574/754 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

18. 128 kB Flash Memory (F-ZTAT)
18.11.5 Auto-Erase Mode
1. Auto-erase mode supports only entire memory erasing.
2. Do not perform a command write during auto-erasing.
3. Confirm normal end of auto-erasing by checking I/O6. Alternatively, status read mode can also
be used for this purpose (I/O7 status polling uses the auto-erase operation end identification
pin).
4. 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.
Table 18.17 AC Characteristics in Auto-Erase Mode
Conditions: V_CC = 5.0 V ±10%, V_SS = 0 V, T_a = 25°C ±5°C
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
Erase setup time
Erase end setup time
WE rise time
WE fall time
Symbol
t
nxtc
t_ceh
t_ces
t_dh
t
ds
t
wep
t_ests
t_spa
t_erase
t_ens
t
enh
t_r
t_f
Min
20
0
0
50
50
70
1
100
100
100
Max
150
40000
30
30
Unit
μs
ns
ns
ns
ns
ns
ms
ns
ms
ns
ns
ns
ns
Notes
Rev.5.00 Sep. 27, 2007 Page 540 of 716
REJ09B0398-0500