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2. Handling Precautions
When using the M34551T2-MCU board, pay attention to the following:
(1) About the emulator
To use the M34551T2-MCU board, you always need to install it on the PC4504 emulator main
unit.
(2) About the MCU board installation
Before installing (and removing) the MCU board, always be sure to power off the PC4504
emulator main unit and unplug its power cord from the outlet. For details on how to install and
remove the MCU board, see "Chapter 2. Set-up" in the PC4504 System User’s Manual.
(3) Emulator debugger
When using the M34551T2-MCU board to debug your program, you need to have the M3T-PD45
emulator debugger (sold separately). You need also the data file for 4551/4555 Group included
with M3T-PD45.
(4) Registers that can be operated from M3T-PD45
Table 2.1 lists the registers that can be operated from the M3T-PD45. The "O" in the table means
that the register can be operated; the "X" means that the register cannot be operated.
Table 2.1 Registers that can be operated from M3T-PD45
(5) About the system clock frequency
When setting both bit 3 and bit 0 in the MR clock control register to "0" (high-speed mode, system
clock = f(XIN)), the system clock frequency should be in the following ranges.
•VDD = 3.0 V: XIN ≤ 1.0 MHz
•VDD = 5.0 V: XIN ≤ 2.0 MHz
Register Reference Modification Register Reference Modification
PC O O W1 O O
CY O O W2 O O
AOOW3OO
BOOC1OO
XOOC2XO
YOOCROO
ZOOPU0 O O
DOORLC O O
EOOMROO
SP O X R1 X O
V1 O O L1 X O
V2 O O L2 X O
I1 O O