Texas Instruments Development Kit for TM4C129x,Tiva™ ARM® Cortex™ -M4 Microcontroller DK-TM4C129X DK-TM4C129X Datenbogen
Produktcode
DK-TM4C129X
retained following power cycling. Once the register contents are committed, the only way to restore
the factory default values is to perform the sequence described in “Recovering a "Locked"
Microcontroller” on page 223.
the factory default values is to perform the sequence described in “Recovering a "Locked"
Microcontroller” on page 223.
All of the FMPREn and USER_REGn registers, in addition to the BOOTCFG register can be
committed in non-volatile memory. The FMPREn, FMPPEn, and USER_REGn registers can be
tested before being committed; the BOOTCFG register cannot. To program the BOOTCFG register,
the value must be written into the Flash Memory Data (FMD) register before it is committed. The
BOOTCFG configuration cannot be tried and verified before committing to non-volatile memory.
committed in non-volatile memory. The FMPREn, FMPPEn, and USER_REGn registers can be
tested before being committed; the BOOTCFG register cannot. To program the BOOTCFG register,
the value must be written into the Flash Memory Data (FMD) register before it is committed. The
BOOTCFG configuration cannot be tried and verified before committing to non-volatile memory.
Important: All Flash memory resident registers can only have bits changed from 1 to 0 by user
programming. The FMPREn and BOOTCFG registers can be committed multiple times,
but the USER_REGn registers can only be committed once, after the entire register
has been set to 1s. After being committed, the USER_REGn registers can only be
returned to their factory default values of all 1s by performing the sequence described
in “Recovering a "Locked" Microcontroller” on page 223. The mass erase of the main
Flash memory array caused by the sequence is performed prior to restoring these
registers.
but the USER_REGn registers can only be committed once, after the entire register
has been set to 1s. After being committed, the USER_REGn registers can only be
returned to their factory default values of all 1s by performing the sequence described
in “Recovering a "Locked" Microcontroller” on page 223. The mass erase of the main
Flash memory array caused by the sequence is performed prior to restoring these
registers.
Table 8-3 on page 644 provides the FMA address required for commitment of each of the registers
and the source of the data to be written when the FMC register is written with a key value of 0xA442
or the
and the source of the data to be written when the FMC register is written with a key value of 0xA442
or the
PEKEY
value of the FLPEKEY register. The key value used is determined by the
KEY
bit in
the BOOTCFG register at reset. If the
KEY
value is 0x0, the
PEKEY
value in the FLPEKEY register
is used for commits in the FMC/FMC2 register. If the
KEY
value is 0x1, the value 0xA442 is used
as the
WRKEY
in the FMC/FMC2 register. If the After writing the
COMT
bit, the user may poll the FMC
register to wait for the commit operation to complete.
Table 8-3. User-Programmable Flash Memory Resident Registers
Data Source
FMA Value
Register to be Committed
FMPRE0
0x0000.0000
FMPRE0
FMPRE1
0x0000.0002
FMPRE1
FMPRE2
0x0000.0004
FMPRE2
FMPRE3
0x0000.0006
FMPRE3
FMPRE4
0x0000.0008
FMPRE4
FMPRE5
0x0000.000A
FMPRE5
FMPRE6
0x0000.000C
FMPRE6
FMPRE7
0x0000.000E
FMPRE7
FMPRE8
0x0000.0010
FMPRE8
FMPRE9
0x0000.0012
FMPRE9
FMPRE10
0x0000.0014
FMPRE10
FMPRE11
0x0000.0016
FMPRE11
FMPRE12
0x0000.0018
FMPRE12
FMPRE13
0x0000.001A
FMPRE13
FMPRE14
0x0000.001C
FMPRE14
FMPRE15
0x0000.001E
FMPRE15
FMPPE0
0x0000.0001
FMPPE0
FMPPE1
0x0000.0003
FMPPE1
FMPPE2
0x0000.0005
FMPPE2
FMPPE3
0x0000.0007
FMPPE3
December 13, 2013
644
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