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CHAPTER 24 512K-BIT FLASH MEMORY
24.6.1 Data Polling Flag (DQ7)
The data polling flag (DQ7) uses the data polling function to post that the automatic
algorithm is being executed or has terminated
■ Data Polling Flag (DQ7)
Table 24.6-3 and Table 24.6-4 list the state transitions of the data polling flag.
●
Write
Read-access during execution of the automatic write algorithm causes the flash memory to output the
opposite data of bit 7 last written, regardless of the value at the address specified by the address signal.
Read-access at the end of the automatic write algorithm causes the flash memory to output bit 7 of the read
value of the address specified by the address signal.
●
Chip erase
Read-access during execution of the chip erase algorithm causes the flash memory to output 0. Read-access
at the end of the automatic chip algorithm causes the flash memory to output 1 in the same way.
Note:
When the automatic algorithm is being started, read-access to the specified address is ignored. Since
termination of the data polling flag (DQ7) can be accepted for a data read and other bits output, data
read after the automatic algorithm has terminated should be performed after read-access has confirmed
that data polling has terminated.
Table 24.6-3 State Transition of Data Polling Flag (State change at normal operation)
Operating State Programming
→ Completed
Chip Erasing →
Completed
DQ7 DQ7
→ DATA:7 0 → 1
Table 24.6-4 State Transition of Data Polling Flag (State change at abnormal operation)
Operating State Programming Chip Erasing
DQ7 DQ7
0