Table 8-5. Access Violation Indications (continued)
Bus Master
Core Indication
NOTE: To enable bus faults, set the core's System Handler Control and State
Register's BUSFAULTENA bit. If this bit is not set, MPU violations result in
a hard fault (interrupt vector #3).
Debugger
The STICKY ERROR flag is set in the Debug Port Control/Status Register, see
JTAG status and control registers
DMA
Interrupt vector #32
8.8.2 Reset Values for RGD0 Registers
At reset, the MPU is enabled with a single region descriptor (RGD0) that maps the entire
4 GB address space with read, write and execute permissions given to the core, debugger
and the DMA bus masters.
The following table shows the chip-specific reset values for RGD0 and RGDAAC0.
Table 8-6. Reset Values for RGD0 Registers
Register
Reset value
RGD0_WORD0
0000_0000h
RGD0_WORD1
FFFF_FFFFh
RGD0_WORD2
0061_F7DFh
RGD0_WORD3
0000_0001h
RGDAAC0
0061_F7DFh
8.8.3 Write Access Restrictions for RGD0 Registers
In addition to configuring the initial state of RGD0, the MPU implements further access
control on writes to the RGD0 registers. Specifically, the MPU assigns a priority scheme
where the debugger is treated as the highest priority master followed by the core and then
all the remaining masters.
The MPU does not allow writes from the core to affect the RGD0 start or end addresses
nor the permissions associated with the debugger; it can only write the permission fields
associated with the other masters.
These protections (summarized below) guarantee that the debugger always has access to
the entire address space and those rights cannot be changed by the core or any other bus
master.
Usage Guide
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
136
NXP Semiconductors
Содержание KE1xF Series
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