NXP Semiconductors KL25 Series - Page 313

19.31.10 Authentication Status Register (MTB_AUTHSTAT)
The Authentication Status Register reports the required security level and current status
of the security enable bit pairs. Where functionality changes on a given security level,
this change must be reported in this register. It is connected to specific signals used
during the auto-discovery process by an external debug agent.
MTB_AUTHSTAT[3:2] indicates if nonsecure, noninvasive debug is enabled or
disabled, while MTB_AUTHSTAT[1:0] indicates the enabled/disabled state of
nonsecure, invasive debug. For both 2-bit fields, 0b10 indicates the functionality is
disabled and 0b11 indicates it is enabled.
Address: F000_0000h base + FB8h offset = F000_0FB8h
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
R
0
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Bit
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
R
0 1 BIT2 1 BIT0
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
MTB_AUTHSTAT field descriptions
Field Description
31–4
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
3
Reserved
This read-only field is reserved and always has the value 1.
2
BIT2
Connected to NIDEN or DBGEN signal.
1
Reserved
This read-only field is reserved and always has the value 1.
0
BIT0
Connected to DBGEN.
Chapter 19 Micro Trace Buffer (MTB)
KL25 Sub-Family Reference Manual, Rev. 3, September 2012
Freescale Semiconductor, Inc. 313