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LE25S40MB
6. Small Sector Erase
Small sector erase is an operation that sets the memory cell data in any small sector to "1". A small sector consists of
4Kbytes. "Figure 11 Small Sector Erase" shows the timing waveforms, and Figure 20 shows a small sector erase
flowchart. The small sector erase command consists of the first through fourth bus cycles, and it is initiated by inputting
the 24-bit addresses following (20h) or (D7h). Addresses A18 to A12 are valid, and Addresses A23 to A19 are "don't
care". After the command has been input, the internal erase operation starts from the rising CS edge, and it ends
automatically by the control exercised by the internal timer. Erase end can also be detected using status register RDY.
Figure 11 Small Sector Erase
Self-timed
Erase Cycle
tSSE
CS
Mode3
0 1 2 3 4 5 6 7 8
15 16
23 24
31
SCK
Mode0
8CLK
SI
20h / D7h
Add.
Add.
Add.
MSB
SO
High Impedance
7. Sector Erase
Sector erase is an operation that sets the memory cell data in any sector to "1". A sector consists of 64Kbytes. "Figure
12 Sector Erase" shows the timing waveforms, and Figure 20 shows a sector erase flowchart. The sector erase command
consists of the first through fourth bus cycles, and it is initiated by inputting the 24-bit addresses following (D8h).
Addresses A18 to A16 are valid, and Addresses A23 to A19 are "don't care". After the command has been input, the
internal erase operation starts from the rising CS edge, and it ends automatically by the control exercised by the internal
timer. Erase end can also be detected using status register RDY.
Figure 12 Sector Erase
Self-timed
Erase Cycle
tSE
CS
Mode3
0 1 2 3 4 5 6 7 8
15 16
23 24
31
SCK
Mode0
8CLK
SI
D8h
Add.
Add.
Add.
MSB
SO
High Impedance
No.A2096-11/22
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