TM4C1233E6PZ Datasheet, PDF (537/1242 Pages) Texas Instruments – Tiva Microcontroller

Tiva^™ TM4C1233E6PZ Microcontroller
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 525). 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
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
WRKEY
Type WO
WO
WO
WO
WO
WO
WO
WO
WO
WO
WO
WO
WO
WO
WO
WO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
reserved
WRBUF
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RW
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit/Field
31:16
15:1
0
Name
WRKEY
reserved
WRBUF
Type
WO
RO
RW
Reset
0x0000
0x000
0
Description
Flash Memory Write Key
This field contains a write key, which is used to minimize the incidence
of accidental Flash memory writes. Depending on the value of the KEY
bit in the BOOTCFG register, the value 0xA442 or 0x71D5 must be
written into this field for a Flash memory write to occur. Writes to the
FMC2 register without this WRKEY value are ignored. A read of this field
returns the value 0.
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.
Buffered Flash Memory Write
This bit is used to start a buffered write to Flash memory.
Value Description
0 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.
1 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.
For information on programming time, see “Flash Memory and
EEPROM” on page 1217.
June 12, 2014
537
Texas Instruments-Production Data