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Connects the VDD of the M34551T2-MCU to
the VDD of the target system.
Sets the MCU’s ROM size.
• M4, set SW2 to "4".
• E8, set SW2 to "8".
Operates the target MCU at +5 V.
Operates the target MCU at +3 V.
SW1
SW2
SW3
OFF
ON
5 V
3 V
OFF
4
5 V
4.3 Description of Switches
The M34551T2-MCU board has nine switches. Figure 4.2 shows the positions of these switches.
Tables 4.2 and 4.3 list the functions of the switches and the preset switch positions that are set before
the MCU board is shipped from the factory.
Figure 4.2 Positions of switches
Table 4.2 Functions of switches (1/2)
Does not connect the VDD of the M34551T2-
MCU to the VDD of the target system.
Label Switch position
Description Factory-setting
ROMSIZE
OFFON
OFFON
5 V
3 V
5 V
3 V