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LE25S40MB
8. Chip Erase
Chip erase is an operation that sets the memory cell data in all the sectors to "1". "Figure 13 Chip Erase" shows the
timing waveforms, and Figure 20 shows a chip erase flowchart. The chip erase command consists only of the first bus
cycle, and it is initiated by inputting (60h) or (C7h). 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 13 Chip Erase
Self-timed
Erase Cycle
tCHE
CS
Mode3
0 1 2 3 4 5 6 7
SCK
Mode0
8CLK
SI
SO
60h / C7h
MSB
High Impedance
9. Page Program
Page program is an operation that programs any number of bytes from 1 to 256 bytes within the same sector page (page
addresses: A18 to A8). Before initiating page program, the data on the page concerned must be erased using small
sector erase, sector erase, or chip erase. "Figure 14 Page Program" shows the page program timing waveforms, and
Figure 21 shows a page program flowchart. After the falling CS, edge, the command (02H) is input followed by the 24-
bit addresses. Addresses A18 to A0 are valid. The program data is then loaded at each rising clock edge until the rising
CS edge, and data loading is continued until the rising CS edge. If the data loaded has exceeded 256 bytes, the 256
bytes loaded last are programmed. The program data must be loaded in 1-byte increments, and the program operation is
not performed at the rising CS edge occurring at any other timing.
Figure 14 Page Program
Self-timed
Program Cycle
tPP
CS
Mode3
0 1 2 3 4 5 6 7 8
15 16
23 24
31 32
39 40
47
2079
SCK
Mode0
8CLK
SI
02h
Add.
Add.
Add.
PD
PD
PD
MSB
SO
High Impedance
No.A2096-12/22
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