Technical information

Section 3 Software Specifications when Using the SH7080 Series/SH7146 Series/SH/Tiny Series

Rev. 5.00 Aug. 18, 2009 Page 52 of 78

REJ10J1237-0500

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 emulator 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

mode] 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 sources are not displayed.

2. The AUD branch 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. In the emulator, when multiple loops are performed to reduce the number of AUD trace

displays, only the IP counts up.

5. In the emulator, the maximum number of trace displays is 262144 lines (131072 branches).

However, the maximum number of trace displays differs according to the AUD trace

information to be output. Therefore, the above pointers cannot always be acquired.

6. If a completion-type exception occurs during exception branch acquisition, the next address to

the address in which an exception occurs is acquired.

7. The AUD trace is disabled while the profiling function is used.