HD64F2149 Datasheet, PDF (729/1035 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

FA17 to FA0
CE
OE
WE
FO7
FO6
FO7 to FO0
t_ces
t_ceh
t_wep
t_f
t_r
t_ds
t_dh
t_nxtc
CL_in
H'20
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 22.21 Auto-Erase Mode Timing Waveforms
Notes on Use of Auto-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.
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