R0E00008AKCE00EP9 Datasheet, PDF (15/23 Pages) Renesas Technology Corp – Microcomputer Development Environment System

E8a Emulator
Section 6 Notes on Using the E8a Emulator
10. Operation clock during a user program halt
When the user program halts, the emulator changes the CPU clock to the internal high-speed on-chip oscillator
(approx. 8MHz) to operate. However, the peripheral features operate with the clock specified by the user program.
11. Reset
The reset vector is used by the E8a emulator program. If the MCU is reset while executing the user program,
control is transferred to the E8a emulator program and the user program is forced to stop. Do not use the voltage
monitor 1 reset, voltage monitor 2 reset, watchdog timer reset and software reset, otherwise the E8a emulator will
not operate normally.
12. Memory access during emulation execution
When referring to or modifying the memory contents, the user program is temporarily halted. For this reason, a
real-time emulation cannot be performed. When a real-time emulation is necessary during a program execution,
disable the automatic update in the watch window or fix the display in the memory window before running the
program so that memory accesses do not occur during an execution.
13. When the E8a emulator does not supply power to the user system, it consumes the power voltage of the user
system from several mA to more than 10 mA. This is because the user power supply drives 74LVC125,
74LVC1T45 and 74LVC2T45 to make the communication signal level match the user system power supply
voltage.
14. When debugging, the Flash memory is frequently rewritten by the E8a emulator. Therefore, do not use an MCU
that has been used for debugging in products. Also, as the E8a emulator program is written to the MCU while
debugging, do not save the contents of the MCU Flash memory which were used for debugging nor use them as
the ROM data for products.
15. Reserved area
The addresses not specified in the Hardware Manual for R8C/18, R8C/19, R8C/1A and R8C/1B Groups are
reserved area. Do not change the contents. Otherwise, the E8a emulator cannot control the MCU.
16. Debugging in stop mode or wait mode
When debugging in stop mode or wait mode, do not operate windows until the program stops at the breakpoint by
setting the breakpoint at the line of the program which will be executed after the stop mode or wait mode is
cancelled. 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. When the program is forcibly
stopped, or the memory is referred to or modified in stop or wait mode, the stop or wait mode will be cancelled.
17. Peripheral I/Os during a halt
During a user program halt, interrupts are not accepted although peripheral I/Os continue to run. For example, a
timer interrupt is not accepted although the timer continues to count when a user program is stopped by a break
after the timer started.
REJ10J1646-0200 Rev.2.00 Jun. 17, 2009
Page 12 of 18