HD6432345 Datasheet, PDF (611/907 Pages) Hitachi Semiconductor – H8S/2345 F-ZTAT Hardware Manual

FWE
t_ens
Address
t_ces
t_ceh
CE
OE
WE
FO₇
FO₆
Data
t_wep
t_f
t_r
t_ds
t_dh
t_nxtc
CL_in
H'20
t_enh
t_spa
t_ests
t_{erase (100 to 40000 ms)}
Erase end identification
signal
Erase normal end
confirmation signal
t_nxtc
DL_in
H'20
FO₀ to FO₅ = 0
Figure 17.32 Auto-Erase Mode Timing Waveforms
Notes on Use of Erase-Program Mode
• Auto-erase mode supports only entire memory erasing.
• Do not perform a command write during auto-erasing.
• Confirm normal end of auto-erasing by checking FO₆. Alternatively, status read mode can also
be used for this purpose (FO₇ status polling uses the auto-erase operation end identification
pin).
• The status polling FO₆ and FO₇ pin information is retained until the next command write. Until
the next command write is performed, reading is possible by enabling CE and OE.
17.13.7 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.
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