Renesas SuperH HS0720KCU01HE - Manual (Page 44)

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• I-Bus: A bus cycle generated by the CPU or DMA is acquired. A bus cycle is not
acquired when the cache has been hit.
(c) Software Trace Function
Note: This function can be supported with SHC/C++ compiler (manufactured by Renesas
Technology Corp.; including OEM and bundle products) V7.0 or later.
When a specific instruction is executed, the PC value at execution and the contents of one
general register are acquired by trace. Describe the Trace(x) function (x is a variable name) to
be compiled and linked beforehand. For details, refer to the SHC manual.
When the load module is downloaded on the target system and is executed while a software
trace function is valid, the PC value that has executed the Trace(x) function, the general
register value for x, and the source lines are displayed.
To activate the software trace function, select the [Software trace] check box in the [AUD
function] group box of the [Trace mode] page.
Notes on AUD Trace:
1. When the trace display is performed during user program execution, the mnemonics, operands,
or source is not displayed.
2. The AUD trace function outputs the differences between newly output branch source addresses
and previously output branch source addresses. The window trace function outputs the
differences between newly output addresses and previously output addresses. If the previous
branch source address is the same as the upper 16 bits, the lower 16 bits are output. If it
matches the upper 24 bits, the lower 8 bits are output. If it matches the upper 28 bits, the lower
4 bits are output.
The emulator regenerates the 32-bit address from these differences and displays it in the
[Trace] window. If the emulator cannot display the 32-bit address, it displays the difference
from the previously displayed 32-bit address.
3. If the 32-bit address cannot be displayed, the source line is not displayed.
4. If a completion-type exception occurs during exception branch acquisition, the next address to
the address in which an exception occurs is acquired.
5. The AUD trace is disabled while the profiling function is used.
6. Set the AUD clock (AUDCK) frequency to 50 MHz or lower. If the frequency is higher than
50 MHz, the emulator will not operate normally.
7. If breaks occur immediately after executing non-delayed branch and TRAPA instructions and
generating a branch due to exception or interrupt, a trace for one branch will not be acquired
immediately before such breaks. However, this does not affect on generation of breaks caused
by a BREAKPOINT and a break before executing instructions of Event Condition.