TH58100FT Datasheet, PDF (34/43 Pages) Toshiba Semiconductor – TENTATIVE TOSHIBA MOS DIGITAL INTEGRATED CIRCUIT SILICON GATE CMOS

APPLICATION NOTES AND COMMENTS
TH58100FT
(1) Power-on/off sequence:
The WP signal is useful for protecting against data corruption at power-on/off. The following timing
sequence is necessary.
The WP signal may be negated any time after the VCC reaches 2.5 V and CE signal is kept high in
power up sequence.
0V
CE , WE , RE
CLE, ALE
WP
2.7 V
2.5 V
V_CC
Don’t
care
V_IL
V_IH
Operation
Figure 15. Power-on/off Sequence
Don’t
care
V_IL
In order to operate this device stably, after VCC becomes 2.5 V, it recommends starting access after about
200 ms.
(2) Status after power-on
The following sequence is necessary because some input signals may not be stable at power-on.
Power on
FF
Reset
Figure 16.
(3) Prohibition of unspecified commands
The operation commands are listed in Table 3. Input of a command other than those specified in Table 3 is
prohibited. Stored data may be corrupted if an unknown command is entered during the command cycle.
(4) Restriction of command while Busy state
During Busy state, do not input any command except 70H, 71H and FFH.
(5) Acceptable commands after Serial Input command “80H”
Once the Serial Input command “80H” has been input, do not input any command other than the Program
Execution command “10H”, “11H” or “15H” or the Reset command “FFH”.
If a command other than “10H”, “11H”, “15H” or “FFH” is input, the Program operation is not performed.
80
XX
10
Command other than Programming cannot be executed.
“10H”, “11H”, “15H” or “FFH”
For this operation the “FFH” command is needed.
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