
9.6 Micro Trace Buffer (MTB)
The Micro Trace Buffer (MTB) provides a simple execution trace capability for the
Cortex-M0+ processor.
When enabled, the MTB records changes in program flow reported by the Cortex-M0+
processor, via the execution trace interface, into a configurable region of the SRAM.
Subsequently, an off-chip debugger may extract the trace information, which would
allow reconstruction of an instruction flow trace. The MTB does not include any form of
load/store data trace capability or tracing of any other information.
In addition to providing the trace capability, the MTB also operates as a simple AHB-Lite
SRAM controller. The system bus masters, including the processor, have read/write
access to all of the SRAM via the AHB-Lite interface, allowing the memory to be also
used to store program and data information. The MTB simultaneously stores the trace
information into an attached SRAM and allows bus masters to access the memory. The
MTB ensures that trace information write accesses to the SRAM take priority over
accesses from the AHB-Lite interface.
The MTB includes trace control registers for configuring and triggering the MTB
functions. The MTB also supports triggering via TSTART and TSTOP control functions
in the MTB DWT module.
9.7 Debug in low-power modes
In low-power modes, in which the debug modules are kept static or powered off, the
debugger cannot gather any debug data for the duration of the low-power mode.
• In the case that the debugger is held static, the debug port returns to full functionality
as soon as the low-power mode exits and the system returns to a state with active
debug.
• In the case that the debugger logic is powered off, the debugger is reset on recovery
and must be reconfigured once the low-power mode is exited.
Power mode entry logic monitors Debug Power Up and System Power Up signals from
the debug port as indications that a debugger is active. These signals can be changed in
RUN, VLPR, WAIT and VLPW. If the debug signal is active and the system attempts to
enter Stop or VLPS, FCLK continues to run to support core register access. In these
modes in which FCLK is left active the debug modules have access to core registers but
not to system memory resources accessed via the crossbar.
Micro Trace Buffer (MTB)
K32 L2A Reference Manual, Rev. 2, 01/2020
156
NXP Semiconductors
Содержание K32 L2A Series
Страница 2: ...K32 L2A Reference Manual Rev 2 01 2020 2 NXP Semiconductors...
Страница 42: ...K32 L2A Reference Manual Rev 2 01 2020 42 NXP Semiconductors...
Страница 122: ...Flash Memory Clock K32 L2A Reference Manual Rev 2 01 2020 122 NXP Semiconductors...
Страница 146: ...Module operation in low power modes K32 L2A Reference Manual Rev 2 01 2020 146 NXP Semiconductors...
Страница 158: ...Debug and security K32 L2A Reference Manual Rev 2 01 2020 158 NXP Semiconductors...
Страница 174: ...Module Signal Description Tables K32 L2A Reference Manual Rev 2 01 2020 174 NXP Semiconductors...
Страница 246: ...Application information K32 L2A Reference Manual Rev 2 01 2020 246 NXP Semiconductors...
Страница 322: ...Kinetis Bootloader Status Error Codes K32 L2A Reference Manual Rev 2 01 2020 322 NXP Semiconductors...
Страница 344: ...Application initialization information K32 L2A Reference Manual Rev 2 01 2020 344 NXP Semiconductors...
Страница 374: ...CMP Trigger Mode K32 L2A Reference Manual Rev 2 01 2020 374 NXP Semiconductors...
Страница 384: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 384 NXP Semiconductors...
Страница 592: ...Application Information K32 L2A Reference Manual Rev 2 01 2020 592 NXP Semiconductors...
Страница 602: ...Initialization and application information K32 L2A Reference Manual Rev 2 01 2020 602 NXP Semiconductors...
Страница 656: ...Functional Description K32 L2A Reference Manual Rev 2 01 2020 656 NXP Semiconductors...
Страница 664: ...Functional Description K32 L2A Reference Manual Rev 2 01 2020 664 NXP Semiconductors...
Страница 744: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 744 NXP Semiconductors...
Страница 762: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 762 NXP Semiconductors...
Страница 806: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 806 NXP Semiconductors...
Страница 868: ...Integer square root K32 L2A Reference Manual Rev 2 01 2020 868 NXP Semiconductors...
Страница 976: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 976 NXP Semiconductors...
Страница 1012: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 1012 NXP Semiconductors...
Страница 1094: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 1094 NXP Semiconductors...
Страница 1132: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 1132 NXP Semiconductors...
Страница 1182: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 1182 NXP Semiconductors...
Страница 1290: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 1290 NXP Semiconductors...
Страница 1344: ...USB Voltage Regulator Module Signal Descriptions K32 L2A Reference Manual Rev 2 01 2020 1344 NXP Semiconductors...
Страница 1356: ...Initialization Application Information K32 L2A Reference Manual Rev 2 01 2020 1356 NXP Semiconductors...