TM4C1233D5PZ Datasheet, PDF (555/1242 Pages) Texas Instruments – Tiva Microcontroller

Tiva^™ TM4C1233D5PZ Microcontroller
Register 22: EEPROM Password (EEPASS0), offset 0x034
Register 23: EEPROM Password (EEPASS1), offset 0x038
Register 24: EEPROM Password (EEPASS2), offset 0x03C
The EEPASSn registers are used to configure a password for a block. A password may only be set
once and cannot be changed. The password may be 32-bits, 64-bits, or 96-bits. Each word of the
password can be any 32-bit value other than 0xFFFF.FFFF (all 1s). To set a password, the EEPASS0
register is written to with a value other than 0xFFFF.FFFF. When the write completes, as indicated
in the EEDONE register, the application may choose to write to the EEPASS1 register with a value
other than 0xFFFF.FFFF. When that write completes, the application may choose to write to the
EEPASS2 register with a value other than 0xFFFF.FFFF to create a 96-bit password. The registers
do not have to be written consecutively, and the EEPASS1 and EEPASS2 registers may be written
at a later date. Based on whether 1, 2, or all 3 registers have been written, the unlock code also
requires the same number of words to unlock.
Note: Once the password is written, the block is not actually locked until either a reset occurs or
0xFFFF.FFFF is written to EEUNLOCK.
EEPROM Password (EEPASSn)
Base 0x400A.F000
Offset 0x034
Type RW, reset -
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
PASS
Type RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
Reset
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
PASS
Type RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
Reset
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Bit/Field
31:0
Name
PASS
Type
RW
Reset
-
Description
Password
This register reads as 0x1 if a password is registered for this block and
0x0 if no password is registered. A write to this register if it reads as 0x0
sets the password. If an attempt is made to write to this register when
it reads as 0x1, the write is ignored and the NOPERM bit in the EEDONE
register is set.
June 12, 2014
555
Texas Instruments-Production Data