Fujitsu F2 Uživatelský manuál stáhnout pdf (Strana 182)

168

CHAPTER 2 DEPENDENCE FUNCTIONS

Figure 2.3-2 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 two regions:

- Address

- Address mask

- Access attribute (read/write)

Another function can be used so that sampling of redundant frames occupying two or more trace frames, such

as SLEEP and READY, can be reduced to sampling of one frame.

■ Trace Trigger Setup

When preselected conditions are met during MCU bus operation monitoring, a trigger for starting a trace can

be generated. This function is called a trace trigger.

For the use of the trace trigger function, specify the code (/CODE) and data access (/READ/WRITE).

Up to 8 trace triggers can be preset each for code attribute and data access attribute. However, actually, the

maximum number of trace triggers is determined as indicated below because the common hardware is used

with events.

Current trace trigger maximum constant

= 8 - (current data monitoring break count setting + current event count setting)

For the trace trigger setup conditions that can be defined, see Table 2.3-4.

For trace trigger setup, use the following commands:

- SET TRACETRIGGER : Sets trace trigger

- CANCEL TRACETRIGGER : Deletes trace trigger

- SHOW TRACE/STATUS : Displays trace setup status

Figure 2.3-3 shows a trace sampling operation.

-3

-2

-1

0 (Trigger point)

1 2 ... 177 178 179 180 181 182 183 184 185 186 187 ... 353 354

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Fujitsu F2 Uživatelský manuál Strana 182