SH7050 Datasheet, PDF (598/841 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH RISC engine Family/

Section 18 ROM (128 kB Version)
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 D6. Alternatively, status read mode can also
be used for this purpose (D7 status polling uses the auto-erase operation end identification
pin).
4. Status polling D6 and D7 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 18.16 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
Rev. 5.00 Jan 06, 2006 page 578 of 818
REJ09B0273-0500