Debugging Note - Renesas QB-78K0FX2L User Manual

QB-78K0FX2L In-Circuit Emulator

4.2 Debugging Note

- Operation after target system power application
After power application, a program will be executed for the target device mounted in the target system when reset
is released. However, with the QB-78K0FX2L, the program does not start until an operation to start execution is
performed after the program is downloaded using the debugger.
- Supply power from the target system
Be sure to supply power from the target system when the target system is connected. If the debugger is started
without supplying power from the target system, the target system may be damaged.
- Inputting the external clock
When inputting the external clock, input the square waveform with the same potential as the target device to the
clock pins (X2, XT2).
- A watchdog timer reset
A watchdog timer reset is not generated when an area for which the capacities of the internal ROM, internal high-
speed ROM, and internal expansion RAM are not set with the IMS registers is illegally accessed. Emulation is
performed with a fail-safe break.
- Target power supply during a break
Do not turn off the target power supply (do not allow it to become lower than the POC voltage) during a break
(power supply can be turned off only during RUN).
- Relation between Standby function and Break function
The break is interrupt function of CPU. The standby mode is released by the break for using the following debug
function.
- Stops execution of the user program.
- Step execution of the standby instruction (Stops user program after execution instruction)
- Pseudo real-time RAM monitor function (Break When Readout)
- Pseudo Dynamic Memory Modification (Break When Write)
- Breakpoint setting executing of the user program.
R20UT2057EJ0100 Rev.1.00
2012.05.18
CHAPTER 4 CAUTIONS
Page 34 of 37