mc9s12xf512 Freescale Semiconductor, Inc, mc9s12xf512 Datasheet - Page 787
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mc9s12xf512
Manufacturer Part Number
mc9s12xf512
Description
S12x Microcontrollers 16-bit Automotive Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S12XF512.pdf
(1306 pages)
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bit in the DBGC1 register is cleared, returning the module to the disarmed state0. If tracing is enabled a
breakpoint request can occur at the end of the tracing session. If neither tracing nor breakpoints are enabled
then when the final state is reached it returns automatically to state0 and the debug module is disarmed.
16.4.5
The trace buffer is a 64 lines deep by 64-bits wide RAM array. The S12XDBG module stores trace
information in the RAM array in a circular buffer format. The RAM array can be accessed through a
register window (DBGTBH:DBGTBL) using 16-bit wide word accesses. After each complete 64-bit trace
buffer line is read, an internal pointer into the RAM is incremented so that the next read will receive fresh
information. Data is stored in the format shown in
DBGCNT[6:0] are incremented. Tracing of CPU12X activity is disabled when the BDM is active but
tracing of XGATE activity is still possible. Reading the trace buffer whilst the DBG is armed returns
invalid data and the trace buffer pointer is not incremented.
16.4.5.1
Using the TALIGN bits (see
or the beginning of a tracing session.
If End or Mid tracing is selected, tracing begins when the ARM bit in DBGC1 is set and State1 is entered.
The transition to Final State if End is selected signals the end of the tracing session. The transition to Final
State if Mid is selected signals that another 32 lines will be traced before ending the tracing session.
Tracing with Begin-Trigger starts at the opcode of the trigger.
16.4.5.1.1
Storing with Begin-Trigger, data is not stored in the Trace Buffer until the Final State is entered. Once the
trigger condition is met the S12XDBG module will remain armed until 64 lines are stored in the Trace
Buffer. If the trigger is at the address of the change-of-flow instruction the change of flow associated with
the trigger will be stored in the Trace Buffer. Using Begin-trigger together with tagging, if the tagged
instruction is about to be executed then the trace is started. Upon completion of the tracing session the
breakpoint is generated, thus the breakpoint does not occur at the tagged instruction boundary.
16.4.5.1.2
Storing with Mid-Trigger, data is stored in the Trace Buffer as soon as the S12XDBG module is armed.
When the trigger condition is met, another 32 lines will be traced before ending the tracing session,
irrespective of the number of lines stored before the trigger occurred, then the S12XDBG module is
disarmed and no more data is stored. Using Mid-trigger with tagging, if the tagged instruction is about to
be executed then the trace is continued for another 32 lines. Upon tracing completion the breakpoint is
generated, thus the breakpoint does not occur at the tagged instruction boundary.
Freescale Semiconductor
Trace Buffer Operation
Trace Trigger Alignment
Storing with Begin-Trigger
Storing with Mid-Trigger
Section
MC9S12XF - Family Reference Manual, Rev.1.19
16.3.2.3”) it is possible to align the trigger with the end, the middle,
Table
16-42. After each store the counter register bits
Chapter 16 S12X Debug (S12XDBGV3) Module
787
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