Datasheet

Register 7: Flash Memory Control 2 (FMC2), offset 0x020
When this register is written, the Flash memory controller initiates the appropriate access cycle for
the location specified by the Flash Memory Address (FMA) register (see page 654). If the access
is a write access, the data contained in the Flash Write Buffer (FWB) registers is written.
This register must be the final register written as it initiates the memory operation.
Flash Memory Control 2 (FMC2)
Base 0x400F.D000
Offset 0x020
Type RW, reset 0x0000.0000
16171819202122232425262728293031
WRKEY
WOWOWOWOWOWOWOWOWOWOWOWOWOWOWOWOType
0000000000000000Reset
0123456789101112131415
WRBUFreserved
RWROROROROROROROROROROROROROROROType
0000000000000000Reset
DescriptionResetTypeNameBit/Field
Flash Memory Write Key
This field contains a write key, which is used to minimize the incidence
of accidental Flash memory writes. There are two options for the WRKEY
value:
If the KEY value in the BOOTCFG register is 0x1 at reset, the value
0xA442 is used as a key enable to initiate the appropriate access cycle
for the location specified by the address in the FMA register.
If the KEY value in the BOOTCFG register is 0x0 at reset, the value
programmed in the FLPEKEY register is used as a key enable to initiate
the appropriate access cycle for the location specified by the address
in the FMA register.
Writes to the FMC2 register without this WRKEY value are ignored. A
read of this field returns the value 0.
0x0000WOWRKEY31:16
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
0x000ROreserved15:1
Buffered Flash Memory Write
This bit is used to start a buffered write to Flash memory.
DescriptionValue
A write of 0 has no effect on the state of this bit.
When read, a 0 indicates that the previous buffered Flash
memory write access is complete.
0
Set this bit to write the data stored in the FWBn registers to the
location specified by the contents of the FMA register.
When read, a 1 indicates that the previous buffered Flash
memory write access is not complete.
1
For information on programming time, see “Flash Memory” on page 2124.
0RWWRBUF0
667December 13, 2013
Texas Instruments-Advance Information
Tiva
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TM4C129XNCZAD Microcontroller