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CHAPTER 24 512K-BIT FLASH MEMORY
To determine whether automatic writing or chip erase is being executed, the hardware sequence flags can
be checked or the status can be determined from the RDY bit of the flash memory control status register
(FMCS) that indicates whether writing has been completed. After writing/erasing has terminated, the state
returns to the read/reset state. When creating a program, use one of the flags to confirm that automatic
writing/erasing has terminated. Then, perform the next processing operation, such as data read. The
following sections describe each hardware sequence flag separately. Table 24.6-2 lists the functions of the
hardware sequence flags.
Table 24.6-2 Hardware Sequence Flag Function
State DQ7 DQ6 DQ5
State change for
normal operation
Write → Write completed
(write address specified)
DQ7
→
DATA:7
Toggle →
DATA:6
0 →
DATA:5
Chip/selector erase → Erase completed 0 → 1 Toggle →
Stop
0 → 1
Abnormal operation Write DQ7
Toggle 1
Chip erase 0 Toggle 1