Renesas TM V.3.20A Especificaciones descargar pdf (Pagina 676)

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Renesas Technology, Tools FAQs

Last Updated: October 19, 2001

Document Number: 01100502_e

When I try to execute the instruction that sets the stack pointer with a step program, while using M38000TL2-FPD and M37531RSS

in combination, the emulator begins to malfunction, as shown below. Is there a work-around for this?

[Example]

------------------------------------------------------

C000 LDX #3Fh

C002 TXS ; Stack pointer setting

C003 LDM #C4,3Bh ; CPU mode register setting

C006 NOP

------------------------------------------------------

In the emulator system, the user's stack pointer uses 3 bytes for step execution or user program execution/stop.

In the example program above, when the TXS instruction in line 2 is executed, the stack pointer temporarily indicates the SFR area

of M37531 (not the internal RAM area). Therefore, the emulator system cannot access the stack correctly and, as a result,

malfunctions.

To avoid this problem, set a break point at the location where the stack pointer setting is completed, and then execute the program

from that point. In the above example, the break point should be set at address C006, and then the program should be executed from

there. Once you have done this, there should be no problem in executing the step program.

In the actual MCU, this problem will not occur, as the stack will not be used when executing these instructions.

The following restrictions apply to the stack area in the emulator system. Please keep these in mind when debugging your program.

In this emulator, up to 3 bytes of the user stack is used as a work area.

●

If there is not enough user stack area available, areas that cannot be used for stack (SFR areas, RAM or ROM areas which are

storing data) will be used as the work area, which may cause problems in the user program or loss of emulator functions.

Therefore, always reserve the users stack area with 3 bytes more than the maximum amount used by the user program.

●

After reset, the emulator will use the addresses stored in the MCU file as the beginning of the stack area.●

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