Freescale Semiconductor Microcontrollers - Manual (Page 425)

HC08 FSICEBASE Emulator
Bus State Analyzer (BSA)
425 Microcontrollers Debugger Manual
D occurs, the sequencer starts again looking for event A.) Data storage ends after the
specified number of post-trigger cycles.
If you select this mode, you must enable events A, B, and C. Otherwise, the bus state
analyzer cannot be triggered. If you disable event D, you convert this mode to a simple,
three-event sequence.
A -> B -> C -> D
After execution begins, the trace buffer begins storing data from all cycles. This continues
through the occurrence of four events, A, B, C, and D, in order. Data storage ends after the
specified number of post trigger cycles.
If you select this mode, you must enable all four events A, B, C, then D. Otherwise, the
bus state analyzer cannot be triggered.
Nth Event: A+B+C+D
After execution begins, the trace buffer begins storing data from N occurrences of cycles
that match the definitions of events A, B, C, or D (whichever are enabled). Then the bus
state analyzer captures the next 4096 cycles.
By selecting the terminal post trigger count, the user can control the number of cycles that
is stored. This can be used to speed uploading of the BSA data if only a small portion of
data is needed.
NOTE The terminal count or post trigger cycles are valid only for counted or
sequential modes. For a counted mode, this field specifies the number of cycles
to be stored. For a sequential mode, this field specifies the number of cycles to
be stored after the trigger sequence occurs.
Time Tag Clock Frequency
An optional part of analyzer setup is specifying the frequency and source of the time tag
clock. This clock provides a time reference value in each frame of the trace buffer. To
select the clock frequency, see
Defining Events .
You can select from the following frequencies:
• 32 Mhz Selects the 32 MHz oscillator.
• 16 Mhz Selects the 16 MHz oscillator.
• 8 Mhz Selects the 8 MHz oscillator.
• 4 Mhz Selects the 4 MHz oscillator.
• 2 Mhz Selects the 2 MHz oscillator.
• 1 Mhz Selects the 1 MHz oscillator.