H8S33 Datasheet, PDF (1033/1489 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

Section 22 ROM
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 polling uses the auto-erase operation end decision 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 22.21 AC Characteristics in Auto-Erase Mode
Conditions: V_CC = 3.3 V ±0.3 V, 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
Rev. 5.00 Mar 28, 2005 page 969 of 1422
REJ09B0234-0500