Fujitsu FR60 Hardware Manual page 572

CHAPTER 17 FLASH MEMORY
[bit 7] DPOLL (Data polling flag)
This flag is used with the data polling function to report that the automatic algorithm is being executed
or terminated.
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Automatic write operation status
When read access is performed while the automatic write algorithm is being executed, flash memory
outputs the inversion of bit 7 of the last data written regardless of the address indicated by the address
signal. When read access is performed at the end of the automatic write algorithm, flash memory outputs
bit 7 of the read data to the address indicated by the address signal.
●
Chip/sector erase operation status
When read access is performed while the erase/sector erase algorithm is being executed for a sector erase,
flash memory outputs "0" from the chip currently being erased. For a chip erase, flash memory outputs "0"
regardless of the address indicated by the address signal. Similarly, flash memory outputs "1" at the end of
the erase/sector erase algorithm.
●
Temporary sector erase stop status
When read access is performed during temporary sector erase stop status, flash memory outputs "1" when
the address indicated by the address signal is included in the sector in erase status. If the address is not
included in the sector in erase status, flash memory outputs bit 7 of the read value to the address. For
checking whether a sector is in temporary sector erase stop status and which sector is in erase status, read
this bit and the toggle bit flag.
Note:
Read access to a specified address is ignored while the automatic algorithm is active. Values can be
output to other bits after data polling flag operation terminates in data read operation. Therefore,
when data is to be read after terminating the automatic algorithm, confirm that data polling is
terminated in the current read access.
[bit 6]: TOGGLE (Toggle bit flag)
As with the data polling flag, this flag is used with the toggle bit function to mainly report that the
automatic algorithm is being executed or terminated.
●
Write or chip/sector erase operation status
When continuous read operations are performed while the automatic write algorithm or chip/sector erase
algorithm is being executed, flash memory outputs "1" and "0" toggle results to bit 6 regardless of the
address indicated by the address signal. When continuous read operations are performed at the end of the
automatic write algorithm or chip/sector erase algorithm, flash memory stops bit 6 from toggling and
outputs bit 6 (DATA: 6) of the data read from the address indicated by the address signal.
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