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CHAPTER2 Dependence Functions
Notes:
1. The execution time display function is available only when a DSU4 evaluation chip with the
external trace bus interface is used. Furthermore, since the execution time is stored in the trace
memory on the adapter unit, measurements cannot be made in the external trace mode in which
the memory is used for trace data storage.
2. This function cannot be used when the performance mode in set as the event mode.
For details, refer to "1.6 SET MODE" in "SOFTUNE Workbench command Reference Manual".
3. When the MCU operation mode is set to "external trace mode" in FR80S, only the data write-
accessed in the built-in RAM area is stored in the trace buffer.
■ Frame Number
A number is assigned to each frame of sampled trace data. This number is called a frame number.
The frame number is used to specify the display start position of the trace buffer. The value 0 is assigned
to trace data at the triggering position for sequencer termination. Negative values are assigned to trace data
sampled before the arrival at the triggering position (Figure 2.3-1 ).
If there is no triggering position for sequencer termination, the value 0 is assigned to the last-sampled trace
data.
Figure 2.3-1 Frame Numbering at Tracing
■ Trace Filter
To make effective use of the limited trace buffer capacity, in addition to the code fetch function, a trace
filter function is incorporated to provide a means of acquiring information about data accesses to a specific
region.
The data trace filter function allows the following values to be specified for data access area.
In DSU4, code can be specified as an access attribute.
- Address
- Address mask
- Access attribute (read/write/code)
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-3
-2
-1
0 (Triggering position)