HD6473847RHV Datasheet, PDF (203/546 Pages) Renesas Technology Corp – Renesas 8-Bit Single-Chip Microcomputer H8 Family / H8/300L Super Low Power Series

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 CE and
OE.
5. Table 6.16 shows the AC characteristics.
Table 6.16 AC Characteristics in Auto-Erase Mode
(Conditions: V_CC = 3.3 V ±0.3 V, V_SS = 0 V, Ta = 25°C ±5°C)
Item
Symbol Min
Command write cycle
t
20
nxtc
CE hold time
t_ceh
0
CE setup time
t_ces
0
Data hold time
t_dh
50
Data setup time
t
50
ds
Write pulse width
t
70
wep
Status polling start time t_ests
1
Status polling access time t_spa
—
Memory erase time
t_erase
100
WE rise time
t
—
r
WE fall time
t
—
f
Max
Unit
—
µs
—
ns
—
ns
—
ns
—
ns
—
ns
—
ms
150
ns
40000 ms
30
ns
30
ns
Test Condition
Figure 6.18
Rev. 7.00 Mar. 08, 2010 Page 171 of 510
REJ09B0024-0700