SH7040 Datasheet, PDF (773/923 Pages) Renesas Technology Corp – Renesas 32-Bit Single-Chip RISC Microprocessor SuperH RISC engine Family/SH7040 Series(CPU Core SH-2)

22.11.5 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 output 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 22.17 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 Unit
µs
ns
ns
ns
ns
ns
ms
150
ns
40000 ms
ns
ns
30
ns
30
ns
Notes
735