Renesas M306NKT3 用户手册
M306NKT3-RPD-E User’s Manual
4. Hardware Specifications
REJ10J0326-0400 Rev.4.00 Sep. 01, 2006
Page 83 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.
about the following precautions.
IMPORTANT
Note on Differences between the Actual MCU and Emulator:
Operations of the emulator system differ from those of actual MCUs as listed below.
(1) Reset
condition
Set the time for rising (0.2 Vcc to 0.8 Vcc) and falling (0.8 Vcc to 0.2 Vcc) 1μs or less.
(2) Initial values of internal resource data of an MCU at power-on
(3) Internal memories (ROM and RAM) capacities etc.
(3) Internal memories (ROM and RAM) capacities etc.
With this emulator system, regardless of ROM and RAM of the MCU you use, all the areas other than
the SFR area and a reserved area (addresses 27000h--27FFFh) can be read and written into.
the SFR area and a reserved area (addresses 27000h--27FFFh) can be read and written into.
(4) Oscillator
circuit
In the oscillator circuit where an oscillator is connected between pins XIN and XOUT, oscillation does
not occur because a converter board is used between the evaluation MCU and the user system. It is same
for pins XCIN and XCOUT. For notes on when using the oscillator circuit on the user system, refer to
"2.9.3 (5) Using the Oscillator Circuit on the User System" (page 44).
not occur because a converter board is used between the evaluation MCU and the user system. It is same
for pins XCIN and XCOUT. For notes on when using the oscillator circuit on the user system, refer to
"2.9.3 (5) Using the Oscillator Circuit on the User System" (page 44).
(5) A/D converter function
Because a converter board, flexible cable and other devices are used between the evaluation MCU and
the user system, the A/D converter operates differently from that of the actual MCU.
the user system, the A/D converter operates differently from that of the actual MCU.
(6) Characteristics of ports P0 to P5, and P10
This product emulates some I/O ports (P0 to P5, and P10). Therefore, the electrical characteristics of
these ports differ from those of an actual MCU.
these ports differ from those of an actual MCU.
(7) 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.
MCUs retain a preceding address and status of BHE#, while this product does not.
(8) 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.
bus is floating.
(9) ALE
signal
When the internal RAM or SFR area of the MCU is accessed during user program execution, with the
actual MCU, ALE output is fixed to Low, while this product outputs ALE signal.
actual MCU, ALE output is fixed to Low, while this product outputs ALE signal.
(10) Pins P57/CLKout
When pins P57/CLKout are used for CLKout function and Fc is selected by Clock output selection in
stop mode, CLKout output does not stop.
stop mode, CLKout output does not stop.
(11) DBC, single-step and BRK instruction interrupt vector table addresses
As the emulator uses the DBC, single-step and BRK instruction interrupt vector table addresses, when
reading these addresses, the downloaded data cannot be read (see Table 4.8).
reading these addresses, the downloaded data cannot be read (see Table 4.8).
Table 4.8 Vector table addresses for the emulator
Factor of interruption
Vector table addresses
Data read
DBC*1 FFFF4h--FFFF7h
Indefinite
Single-step*1 FFFECh--FFFEFh
Indefinite
BRK instruction
FFFE4h--FFFE7h
Indefinite
*1 Interruption for the emulator only
Note on Emulating External Area:
To emulate the external area using emulation memory in this product, set 0 wait (8MHz) or less or 1 wait or
more.
more.