R0E00008AKCE00EP9 Datasheet, PDF (17/23 Pages) Renesas Technology Corp – Microcomputer Development Environment System

E8a Emulator
Section 6 Notes on Using the E8a Emulator
22. Note on debugging in CPU rewrite mode
CPU rewrite can be executed only for the data area. If it is executed for the program area, the E8a emulator cannot
control the MCU. When rewriting the data area, do not halt the user program, while setting up the CPU rewrite
mode and releasing it. If halted, the E8a emulator may not control the MCU. In addition, disable the automatic
update in the watch window or fix the display in the memory window before running the program so memory
accesses do not occur during an execution.
To check the data after executing the CPU rewrite mode, halt the program after releasing the CPU rewrite mode
and refer to the memory window, etc.
If CPU rewrite can be executed for the data area, and erase/program process can be suspended, do not use software
breaks.
23. Note on rewriting Flash memory
Do not reset the MCU when rewriting the Flash memory.
The Flash memory is rewritten when the “Flash memory write end” is displayed in the output window of the High-
performance Embedded Workshop. If the MCU is reset when rewriting the Flash memory, the user program or the
E8a emulator program may be disrupted.
Flash memory rewrite occurs:
- When downloading the user program
- After setting PC breaks in the Flash memory and executing the user program
- After canceling PC breaks in the Flash memory and executing the user program
- After rewriting the value of the Flash memory in the memory window and executing the user program
24. Note on the E8a emulator power supply
When writing a program with the E8a emulator for mass production processes, the program requires reliability, so
do not use the E8a emulator power supply function. Supply power separately to the user system according to the
allowable voltage for MCU writing. Voltage supplied from the E8a emulator depends on the quality of the USB
power supply of the PC, and as such, precision is not guaranteed.
REJ10J1646-0200 Rev.2.00 Jun. 17, 2009
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