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3 description of switches – Renesas Single-Chip Microcomputer M34551T2-MCU User Manual

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Connects the V

DD

of the M34551T2-MCU to

the V

DD

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 V

DD

of the M34551T2-

MCU to the V

DD

of the target system.

Label

Switch position

Description

Factory-setting

ROMSIZE

OFF

ON

OFF

ON

5 V

3 V

5 V

3 V