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CHAPTER 28 3M-BIT FLASH MEMORY
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While a sector erase operation is suspended
If successive reads are executed while a sector erase operation is suspended, and if the address indicates the
sector to be erased, the flash memory toggles to alternately output "1" and "0". If the address indicates the
sector is not to be erased, the flash memory outputs the read value of the bit2 (DATA: 2) to the location
indicated by the address. In the erase-suspend-program mode, successive reads from the non-erase
suspended sector causes the flash memory to output "1".
Both DQ2 and DQ6 are used for detecting an erase-suspended sector (DQ2 toggles, but DQ6 does not).
DQ2 is also used for detecting an erasing sector. While erasing a sector, if a read access is executed from
the erasing sector, DQ2 toggles.
Reference:
If all sectors selected for erasing are write-protected, the toggle bit-2 toggles for about 100μs, and then
returns to the read/reset mode without writing the data.
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