Renesas User System Interface Board HS7047ECH61H Uživatelský manuál stáhnout pdf (Strana 224)

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5.7 Monitor Function

The foreground and background colors cannot be changed in some operating systems.

5.8 Performance Analysis Function

5.8.1 Errors

An error will be included in the measured performance as follows:

• ±one-resolution error (±20-ns error when the measurement resolution is 20 ns)

This error may occur when the user program execution starts or stops (breaks) or when the measurement start

or end condition is satisfied.

• Frequency stability of the crystal oscillating module for performance analysis: ±0.01%

5.8.2 Notes

• In all measurement modes, the interval between the end condition satisfaction and the next start condition

satisfaction must be longer than one-measurement-resolution time. If the interval is shorter than that, the

interval itself is included in the measured time.

• In [Time Of Specified Range Measurement], measurement stops when an instruction is fetched outside the

specified range. In [Start Point To End Point Measurement] and [Start Range To End Range Measurement],

measurement stops when the specified end condition is satisfied. When the same addresses are specified for

these modes, the time measured in [Time Of Specified Range Measurement] is longer than that measured in

[Start Point To End Point Measurement] or [Start Range To End Range Measurement].

• Execution time is measured by using address bus values in prefetch cycles. If the end address condition is

specified at an address near the instruction following a branch instruction or delayed slot instruction, correct

time cannot be measured. Check the bus trace display for the operation after the branch instruction prefetch

cycle, and specify the end address condition at the address in a prefetch cycle which will not be executed by

the branching.

• Channel 1 is not available for performance analysis when the Point to Point trace mode is selected.

• The resolution for the performance analysis function can be set in [Timer Resolution] of the [Configuration

Properties] dialog box. If the clock counter value is set as the resolution, the value shown in [RUN-TIME]

and [MAX-MIN-TIME] will be that of the clock counter (displayed in hexadecimal).

• The counter for measurement has 24 bits, and the maximum measurement time is as given below depending

on the value set in [Timer Resolution].

Table 5.8 Maximum Measurement Time

Value of [Timer Resolution] Maximum Measurement Time

52 us Approximately 14 minutes

1.6 us Approximately 26 seconds

20 ns Approximately 0.33 second

• The maximum measurement count for Access Count of Specified Range Measurement and Called Count of

Specified Range Measurement is 65,535.

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Renesas User System Interface Board HS7047ECH61H Uživatelský manuál Strana 224