Renesas M3T-SRA74 Manual de usuario descargar pdf (Pagina 51)

5.Limitations

5.2. Limitations on KD38

5.2.1. Monitor program

The MCU on the CPU board incorporates a monitor program. There are some following

precautions when operating the KD38 with this monitor program. Refer to “5.4

Limitations on user's program”.

1) Do not perform the step operation and break to the process of the user stack setting.

Set the the stack setting process to interrupt disable status. (I flag =1)

2) Reset a stack pointer to $00FF for a monitor program.

3) The monitor program uses $2000 to $207F and the reserved area of 7544 MCU SFR.

Do not modify the data in this area.

4) The monitor program uses an interrupt. Do not set to interrupt disable state (I flag =

1) in a program other than the stack setting process.

5) When the step operation of the debugger is performed to the I flag control instruction,

the user interrupt process may be operated. A break point set in the user interrupt

process will be disabled. Do not execute the step operation to the I flag control

instruction. (I flag control instruction : CLI,SEI,PLP,PHP,RTI)

6) When an interrupt is acknowledged, the branch to the interrupt process of the user's

program will be performed via the monitor program. Therefore, real time of the user's

program will not be guaranteed.

7) When pressing a reset switch of the CPU board, reload the user's program.

8) Do not perform the step operation for the branch instruction to the self-address.

Example)

NOP

LOOP: BCC LOOP

NOP

Do not perform the step operation for this

instruction

5.2.2. Limitations on stop mode and wait mode

When using stop mode and wait mode in the user's program, close the RAM monitor

window and watch window in advance before executing. Do not generate a memory

access by the debugger during executing the user's program.

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Renesas M3T-SRA74 Manual de usuario Pagina 51