HD6432646 Hitachi, HD6432646 Datasheet - Page 738
HD6432646
Manufacturer Part Number
HD6432646
Description
(HD64F264x Series) 16-Bit Microcomputer
Manufacturer
Hitachi
Datasheet
1.HD6432646.pdf
(1155 pages)
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20.11.5 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
4. Status polling I/O6 and I/O7 pin information is retained until the next command write. As long
Table 20-16 AC Characteristics in Auto-Erase Mode (Conditions: V
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
704
be used for this purpose (I/O7 status polling uses the auto-erase operation end decision pin).
as the next command write has not been performed, reading is possible by enabling CE and
OE.
V
SS
= 0 V, T
a
= 25°C ±5°C)
Symbol
t
t
t
t
t
t
t
t
t
t
t
t
t
nxtc
ceh
ces
dh
ds
wep
ests
spa
erase
ens
enh
r
f
Min
20
0
0
50
50
70
1
—
100
100
100
—
—
Max
—
—
—
—
—
—
—
150
40000
—
—
30
30
CC
= 5.0 V ±0.5 V,
Unit
µs
ns
ns
ns
ns
ns
ms
ns
ms
ns
ns
ns
ns
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