Fujitsu MB96300 series Hardware Manual page 877

F2mc-16fx 16-bit
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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 DQ2 flag toggles. If the address indicates the sector is not to be erased, the flash
memory outputs the read value of the bit 2 (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.
Note:
The DQ2 toggle bit cannot be used in asynchronous mode (FMTCL:SYNC = 0)
CHAPTER 33 FLASH MEMORY
869

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