Fujitsu 8FX User Manual

MB95630H Series
MN702-00009-2v0-E FUJITSU SEMICONDUCTOR LIMITED 569
CHAPTER 26 DUAL OPERATION FLASH MEMORY
26.8 Registers
26.8.3 Flash Memory Sector Write Control Register 0
(SWRE0)
The flash memory sector write control register 0 (SWRE0) is installed in the
Flash memory interface and used to set the function of protecting the Flash
memory against spurious writes.
The flash memory sector write control register 0 (SWRE0) has bits for enabling/disabling
programming data into individual sectors (SA0 to SA2). The initial value of each bit is "0",
meaning programming data is disabled. Writing "1" to a bit in SWRE0 enables programming
data into the sector corresponding to that bit. Writing "0" to a bit in SWRE0 prevents data from
being accidentally written into the sector corresponding to that bit. When "0" is written to a bit
in SWRE0, even though "1" is written to that bit afterward, data cannot be programmed into
the sector corresponding to that bit. To re-program the data, execute a reset operation.
Only write data to SWRE0 by the byte. Setting the bits in SWRE0 using the bit manipulation
instruction is prohibited.
■ Register Configuration
■ Register Functions
[bit7:3] Reserved bits
Always set these bits to "0".
[bit2:0] SA2E, SA1E, SA0E: Programming function setup bits
These bits are used to set the function of preventing data from being accidentally written into a sector of the
Flash memory. Writing "1" to a bit in SWRE0 enables programming data into the sector corresponding to
that bit. Writing "0" to a bit in SWRE0 prevents data from being accidentally written into the sector
corresponding to that bit. In addition, a reset initializes this bit to "0" (programming disabled).
bit 7 6 5 4 3 2 1 0
Field Reserved Reserved Reserved Reserved Reserved SA2E SA1E SA0E
Attribute W W W W W R/W R/W R/W
Initial value 0 0 0 0 0 0 0 0
Table of programming function setup bits and their corresponding Flash memory sectors
Bit name Corresponding sector in Flash memory
SA2E SA2
SA1E SA1
SA0E SA0

Fujitsu 8FX Specifications

General

Brand	Fujitsu
Model	8FX
Category	Computer Hardware
Language	English