Auto-Erase Mode - Renesas H8 Series Hardware Manual

Section 6 ROM
6.10.5

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
.
O E
5. Table 6.18 shows the AC characteristics.
Table 6.18 AC Characteristics in Auto-Erase Mode
Conditions: V = 3.3 V ±0.3 V, V
CC
Item
Command write cycle
hold time
C E
setup time
C E
Data hold time
Data setup time
Write pulse width
Status polling start time
Status polling access time
Memory erase time
rise time
W E
fall time
W E
Rev. 7.00 Mar 10, 2005 page 184 of 652
REJ09B0042-0700
= 0 V, T = 25°C ±5°C
SS a
Symbol Min
t 20
nxtc
t 0
ceh
t 0
ces
t 50
dh
t 50
ds
t 70
wep
t 1
ests
t —
spa
t 100
erase
t —
r
t —
f
Max Unit Notes
— µs Figure 6.18
— ns
— ns
— ns
— ns
— ns
— ms
150 ns
40000 ms
30 ns
30 ns
and
C E