Fujitsu MB90895 Series Hardware Manual page 602

16 bit, controller manual
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CHAPTER 19 512 KBIT FLASH MEMORY
Table 19.4-1 Functions of Flash Memory Write Control Register (FWR0/1)
Bit Name
bit 10 to
Reserved: Reserved bits
bit 15
bit 0 to bit 9
SA9E to SA0E:
Accidental write
preventive function
setting bits
584
Always set these bits to 0.
These bits are used to set the accidental write preventive function
for the individual sectors of the flash memory. Writing "1" to each
of the bits write-enables the corresponding sector. Writing "0" to
the bit activates the accidental write preventive function for the
sector.
Resetting the bit initializes it to "0" (write-protecting the sector).
Accidental write preventive function setting bits and flash memory
sectors
Bit
Bit name
9
SA9E
8
SA8E
7
SA7E
6
SA6E
5
SA5E
4
SA4E
3
SA3E
2
SA2E
1
SA1E
0
SA0E
Write-protected: 0 status. "0" has not been written to the flash
memory write control register (FWR0/1), where you can write "1"
to the register bit for each sector to write-enable the sector. (after
reset state)
Write-enabled: 1 status. Data can be written to the corresponding
sector.
Accidental write preventive: 0 status. "0" has been written to the
flash memory write control register (FWR0/1), where the
corresponding sector cannot be write-enabled ("1") even though
"1" is written to the register bit.
Function
Flash memory sector
SA9
SA8
SA7
SA6
SA5
SA4
SA3
SA2
SA1
SA0

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