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M306NKT-EPB User’s Manual 4. Hardware Specifications
REJ10J0519-0200 Rev.2.00 Oct. 16, 2006 Page 82 of 104
4.3 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.
IMPORTANT
Note on Differences between the Actual MCU and Emulator:
z Operations of the emulator system differ from those of actual MCUs as listed below.
(1) Reset condition
Set the time for starting up (0.2Vcc to 0.8Vcc) 1 μs or less.
(2) Initial values of internal resource data of an MCU at power-on
(3) Interrupt stack pointer (ISP) after a reset is released
(4) Capacities of the internal memories (ROM and RAM)
The evaluation MCU of this product has RAM of 31KB (00400h--07FFFh) and flash ROM of 4KB
(0F000h--0FFFFh) and 512KB (80000h--FFFFFh).
(5) Oscillator circuit
In the oscillator circuit where an oscillator is connected between pins X
IN
and X
OUT
, oscillation does not
occur because a converter board is used between the evaluation MCU and the user system. It is same for
pins X
CIN
and X
COUT
. For notes on when using the oscillator circuit on the user system, refer to "2.11.3
Using the Oscillator Circuit on the User System" (page 46).
(6) A/D conversion
The characteristics of the A/D converter differ from those of actual MCU because there are a package
converter board and other devices between the evaluation MCU and the user system.
(7) Ports P0 to P5, P10
This product emulates some I/O ports (P0 to P5, P10). Therefore, the electrical characteristics of these
ports differ from those of an actual MCU.
(8) Address and status of BHE#
When the internal RAM or ROM area of an MCU is accessed during user program execution, actual
MCUs retain a preceding address and status of BHE#, while this product does not.
(9) Status of a data bus
In stop or wait mode, actual MCUs retain a preceding status of a data bus, while with this product a data
bus is floating.
(10) Operation after releasing the reset
After releasing the reset, for about max. 380 cycles, a program to control the emulator will be executed.
Note that this will be included in the user program execution time and tracing result.
Note on RESET# Input:
z A low input to pin RESET# from the user system is accepted during the user program execution (only while the
RUN status LED on the PC7501's upper panel is lit).
Note on RDY# Input:
z Be sure to input "L" to pin RDY# of the user system during the user program execution (when the RUN status
LED on the PC7501's upper panel is lit). Inputting "L" to pin RDY# during the user program is being stopped
may cause a malfunction of the emulator.
Note on HOLD# Input:
z Be sure to input "L" to pin HOLD# of the user system during the user program execution (when the RUN status
LED on the PC7501's upper panel is lit). Inputting "L" to pin HOLD# during the user program is being stopped
may cause a malfunction of the emulator.
Note on NMI# Input:
z A low input to pin NMI# from the user system is accepted during the user program execution (only while the
RUN status LED on the emulator's upper panel is lit).