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R0E521000CPE00 User's Manual
4.2 Differences between the Actual MCU and Emulator
Differences between the actual MCU and emulator are shown below. When debugging the MCU using this product, be careful
about the following precautions.
Notes on Internal Memory (ROM, RAM):
The evaluation MCU mounted on this product has RAM of 8 KB (00300h--012FFh, 03000h--03FFFh) and flash
ROM of 4 KB (02000h--02FFFh) and 112 KB (04000h--1FFFFh). For this reason, the nonexistent ROM or
RAM area of the target MCU may be accessed.
With this product, the flash ROM area of target MCU is cleared at "04h (NOP instruction)" when starting up the
emulator. If you want the MCU's internal flash ROM to be cleared when starting up the debugger, (when
cleared, the content of the flash ROM is initialized to 0FFh.), select the flash ROM block you want to clear in
the Flash Clear tab of the MCU setting dialog box.
Note on Access Prohibited Area:
You cannot use internally reserved areas. Because an evaluation MCU is operated in the special mode for the
emulator, a function which does not support the target MCU may run.
Notes on RESET# Input:
A low input to RESET# of the dedicated evaluation MCU from the user system is accepted only when a user
program is being executed (when the RUN status LED on the emulator's upper panel is lit).
The time for starting up (0.2 VCC to 0.8 VCC) and falling edge (0.8 VCC to 0.2 VCC) for RESET# pin should
be set to 1 μs or less.
Note on Power-on Reset Function:
This product emulates inputs to the VCC and RESET# pins for the purpose of emulator function control. For
this reason, the power-on reset function cannot be used.
Notes on Maskable Interrupts:
Even if a user program is not being executed (including when run-time debugging is being performed), the
evaluation MCU keeps running so as to control the emulator. Therefore, timers and other components do not
stop running. If a maskable interrupt is requested when the user program is not being executed (including when
run-time debugging is being performed), the maskable interrupt request cannot be accepted, because the
emulator disables interrupts. The interrupt request is accepted immediately after the user program execution is
started.
Take note that when the user program is not being executed (including when run-time debugging is being
performed), a peripheral I/O interruption is not accepted.
Notes on Oscillator Circuit:
Make note that in the oscillator circuit where a resonator is connected between pins P4_6/XIN and
P4_7/XOUT, oscillation does not occur because a flexible cable, buffer IC and other devices are used between
the evaluation MCU and the user system. It is same for sub-clock oscillators (pins P4_3/XCIN and
P4_4/XCOUT).
For notes on when using the oscillator circuit on the user system, refer to "2.3.4 (2) Using an Oscillator Circuit
on the User System" (page 28).
Note on Pin P4_4/XCOUT:
Make note that the pin P4_4/XCOUT of evaluation MCU used with this product does not have an XCOUT
output function.
REJ10J0845-0600 Rev.6.00 Aug. 20, 2009
Page 70 of 92
IMPORTANT
4. Hardware Specifications
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