D12320VF25IV Datasheet, PDF (818/1304 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 19 ROM
A18 to A0
CE
OE
WE
I/O7
I/O6
I/O5 to I/O0
tces
tceh tnxtc
tnxtc
tf
twep _tr
tds
tdh
H'20
tests tspa
terase
Erase end identifi-
cation signal
Erase normal end
confirmation signal
H'20
H'00
Figure 19.26 Auto-Erase Mode Timing Waveforms
19.11.7 Status Read Mode
• Status read mode is used to identify what type of abnormal end has occurred. Use this mode
when an abnormal end occurs in auto-program mode or auto-erase mode.
• The return code is retained until a command write for other than status read mode is
performed.
Table 19.21 AC Characteristics in Status Read 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
OE output delay time
Disable delay time
CE output delay time
WE rise time
WE fall time
Symbol
tnxtc
tceh
tces
tdh
tds
twep
toe
tdf
tce
tr
tf
Min
20
0
0
50
50
70
—
—
—
—
—
Max
—
—
—
—
—
—
150
100
150
30
30
Unit
µs
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Rev.6.00 Sep. 27, 2007 Page 786 of 1268
REJ09B0220-0600