Renesas Single-Chip Microcomputer M34551T2-MCU User Manual download pdf (Page 17)

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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

5 V

3 V

OFF

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

5 V

3 V

5 V

3 V

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 41 42

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Renesas Single-Chip Microcomputer M34551T2-MCU User Manual Page 17