Register 29: Flash Memory Protection Program Enable 4 (FMPPE4), offset
0x410
Note: Offset is relative to System Control base address of 0x400FE000.
This register stores the execute-only protection bits for each 2-KB flash block (FMPREn stores the
execute-only bits). Flash memory up to a total of 64 KB is controlled by this register. Other FMPPEn
registers (if any) provide protection for other 64K blocks. This register is loaded during the power-on
reset sequence. The factory settings for the FMPREn and FMPPEn registers are a value of 1 for
all implemented banks. This achieves a policy of open access and programmability. The register
bits may be changed by writing the specific register bit. However, this register is R/W0; the user can
only change the protection bit from a 1 to a 0 (and may NOT change a 0 to a 1). The changes are
not permanent until the register is committed (saved), at which point the bit change is permanent.
If a bit is changed from a 1 to a 0 and not committed, it may be restored by executing a power-on
reset sequence. The reset value shown only applies to power-on reset; any other type of reset does
not affect this register. Once committed, the only way to restore the factory default value of this
register is to perform the sequence detailed in “Recovering a "Locked" Microcontroller” on page 169.
If the Flash memory size on the device is less than 192 KB, this register usually reads as zeroes,
but software should not rely on these bits to be zero. For additional information, see “Flash Memory
Protection” on page 307.
Flash Memory Protection Program Enable 4 (FMPPE4)
Base 0x400F.E000
Offset 0x410
Type R/W, reset 0xFFFF.FFFF
16171819202122232425262728293031
PROG_ENABLE
R/WR/WR/WR/WR/WR/WR/WR/WR/WR/WR/WR/WR/WR/WR/WR/WType
1111111111111111Reset
0123456789101112131415
PROG_ENABLE
R/WR/WR/WR/WR/WR/WR/WR/WR/WR/WR/WR/WR/WR/WR/WR/WType
1111111111111111Reset
DescriptionResetTypeNameBit/Field
Flash Programming Enable
Configures 2-KB flash blocks to be execute only. The policies may be
combined as shown in Table 7-1 on page 307.
DescriptionValue
Bits [31:0] each enable protection on a 2-KB block of
Flash memory in the range from 257 to 320 KB.
0xFFFFFFFF
0xFFFFFFFFR/WPROG_ENABLE31:0
July 24, 2012344
Texas Instruments-Production Data
Internal Memory
OBSOLETE: TI has discontinued production of this device.