User`s manual

M30850T2-EPB User’s Manual 4. Hardware Specifications
R20UT0208EJ0300 Rev.3.00 Page 77 of 100
Sep 16, 2010
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.
IMPORTANT
Notes on Power Supply to the User System:
• Pin Vcc of the emulator is connected to the user system to observe the voltage of the user system. Therefore
design your system so that the user system is powered separately.
• The voltage of the user system should be within the following.
(1) When JP1 of the M3085T2-EPBM is set as VCC1 = 2:
3.0 V ≤ VCC1 = VCC2 ≤ 5.5 V
(2) When JP1 of the M3085T2-EPBM is set as VCC1 > 2:
4.8 V ≤ VCC1 ≤ 5.2 V
3.3 V ≤ VCC2 < VCC1
• Do not change the voltage of the user system after turning on the power.
Notes on Using This Product When the Voltage of VCC1 is Higher than That of VCC2:
• If using this product when the voltage of VCC1 is higher than that of VCC2, set the JP1 of the M30850T2-
EPBM to VCC1>2. For the switch JP1 of the M3085T2-EPBM, refer to "2.10 Setting Switches" (page 37).
• If using this product when the voltage of VCC1 is higher than that of VCC2, the CPU clock must be 24 MHz or
less.
• If using a CPU clock of 30 MHz or more when the voltage of VCC1 is higher then that of VCC2, set the SFR
area of the intelligent I/O function to 2-wait (set the PM13 bit to "1") when reading this area.
This precaution only needs to be observed when using an emulator, and do not apply for the actual MCU.
Note on Intelligent I/O Resistor Access:
• If using a CPU clock of 30 MHz or more when the voltage of VCC1 is higher then that of VCC2, set the SFR
area of the intelligent I/O function to 2-wait (set the PM13 bit to "1") when reading this area.
This precaution only needs to be observed when using an emulator, and do not apply for the actual MCU.