Suspending Sector Erasure For The Flash Memory - Fujitsu F2MC-16LX Hardware Manual

CHAPTER 26 2M BIT FLASH MEMORY

26.6.5 Suspending Sector Erasure for the Flash Memory

This section describes the procedure for issuing the sector erase suspend command
to suspend a sector erase operation for the flash memory. During erase suspension,
data can be read from any sector that is not subject to erasure.
I Suspending sector erasure for the flash memory
To suspend sector erasure for the flash memory, repeatedly send the sector erase suspend
command in the command sequence table (see Table 26.4-1 "Command sequence table") to
the internal flash memory.
The sector erase suspend command is used to suspend the erasure during a sector erase
operation, allowing data from a sector that is not being erased to be read. In this state, only
reading is allowed; writing is prohibited. This command is enabled only in sector erase mode,
including within the erase wait time, and ignored in chip erase mode or during write operations.
This operation is executed by writing the erase suspend code (B0
arbitrary address in flash memory. During the erase suspend state, repeatedly issued erase
suspend commands are ignored.
If a sector erase suspend command is entered during the sector erase wait time, sector erase
wait ends immediately, the erase operation is interrupted, and the operational state changes to
erase stop. If a erase suspend command is entered during a sector erase operation after the
sector erase wait time, the system enters the erase suspend mode after 15 µs have elapsed or
earlier.
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