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CHAPTER 17 FLASH MEMORY
■ Example of Hardware Sequence Flag Usage
By using hardware sequence flags described above, automatic algorithm status inside the flash memory can
be confirmed. Figure 17.5-2 shows a write/erase confirm flow chart for using data polling function and
Figure 17.5-3 shows a write/erase confirm flow chart for using toggle bit function as examples.
Figure 17.5-2 Write/Erase Confirmation Flow Chart Using Data Polling Function
Write/Erase Start
NO
424
Read (D0 to D7)
Address=VA
D7=Data ?
NO
D5=1 ?
YES
Read (D0 to D7)
Address=VA
YES
D7=Data ?
*
NO
Write/Erase
Fail
VA=Write address
*: D7 and D5 change concurrently.
YES
Write/Erase
Pass
=Sector address erased in the
sector erase operation
=Sector address not protected in
the chip erase operation
For example, even if D5="1", it is
necessary to check D7 again.
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