FlexRay Module Registers
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SPNU563A–March 2018
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FlexRay Module
26.3.2.1.7 Lock Register (LCK)
The lock register is write-only. Reading the register will return 00.
Figure 26-116 and Table 26-95 illustrate this register.
Figure 26-116. Lock Register (LCK) [offset_CC = 1Ch]
31 16
Reserved
R-0
15 8 7 0
TMK CLK
R/W-0 R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 26-95. Lock Register (LCK) Field Descriptions
Bit Field Value Description
31-16 Reserved 0 Reads return 0. Writes have no effect.
15-8 TMK 0-1FFh Test mode key. To write bit WRTEN in the test register to 1, the write operation has to be directly
preceded by two consecutive write accesses to the test mode key (unlock sequence). If this write
sequence is interrupted by other write accesses, bit WRTEN is not set to 1 and the sequence has
to be repeated.
First write (LCK.TMK): 75h = 0b0111 0101
Second write (LCK.TMK): 8Ah = 0b1000 1010
Third write: TEST1.WRTEN = 1
7-0 CLK 0-FFh Configuration lock key. To leave CONFIG state by writing to CMD in the SUC configuration
register 1 (commands READY; MONITOR_MODE; ATM; LOOP_BACK), the write operation has to
be directly preceded by two consecutive write accesses to the configuration lock key (unlock
sequence). If this write sequence is interrupted by other write accesses, the communication
controller remains in CONFIG state and the sequence has to be repeated.
First write (LCK.CLK): CEh = 0b1100 1110
Second write (LCK.CLK): 31h = 0b0011 0001
Third write (SUCC.CMD)
NOTE: In case that the Host uses 8/16-bit accesses to write the listed bit fields, the programmer has
to ensure that no "dummy accesses" (for example, the remaining register bytes / words) are
inserted by the compiler.
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