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CHAPTER 2 DEPENDENCE FUNCTIONS
2.6 Emulator Debugger (MB2100-01)
Software
2.6.8
Support
Ma nual
Viewing Program Execution History [Trace]
This section describes the trace function.
■ What is Trace
The function that records the program execution history is called "trace".
Trace data contains address information before and after branch, which is available for the analysis of the
program execution history.
■ Trace Functions
This emulator debugger has the following trace functions.
• Forced start:
Forcibly starts acquiring trace data without stopping the execution of a user program
while forced stop is executed and trace data acquisition is stopped.
• Forced stop:
Forcibly ends acquiring trace data without stopping the execution of a user program
during acquisition of trace data.
■ Acquiring Trace Data
The followings show the timing of the start/end of trace data acquisition.
● The acquisition is started when:
- a user program has been executed; or
- the [Start] menu has been selected when a user program has been executed.
● The acquisition is ended when:
- a user program has been stopped; or
- the [Abort] menu has been selected during trace data acquisition.
■ Clearing Trace Data
The following shows the timing for clearing trace data.
● Clear
• When a user program is executed
• When the [Forced start] menu is selected while a user program is executed
• When the chip reset is input while a user program is executed
• When the [Clear] menu is selected
■ Trace Buffer
A place to store recorded data is called a "trace buffer".
Each unit of data stored in the trace buffer is called a "frame".
The trace buffer can contain up to 42 frames.
The trace buffer has a ring-like structure. If the trace buffer becomes full, it is automatically overwritten
from the beginning.
July 1, 2014, CM41-00313-8E
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