R8CSLASH2G datasheet(103/344 Pages) RENESAS

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R8C/2G Group

8. I/O Ports

Rev.1.00

Apr 04, 2008

Page 83 of 318

REJ09B0387-0100

8.5

Unassigned Pin Handling

Table 8.34 lists Unassigned Pin Handling.

NOTES:

1. If these ports are set to output mode and left open, they remain in input mode until they are switched

to output mode by a program. The voltage level of these pins may be undefined and the power

current may increase while the ports remain in input mode.

The content of the direction registers may change due to noise or program runaway caused by

noise. In order to enhance program reliability, the program should periodically repeat the setting of

the direction registers.

2. Connect these unassigned pins to the MCU using the shortest wire length (2 cm or less) possible.

3. When the power-on reset function is in use.

Figure 8.10

Unassigned Pin Handling

Table 8.34

Unassigned Pin Handling

Pin Name

Connection

Ports P0_4 to P0_7, P1, P3,

P4_3 to P4_5, P6_0, P6_3 to P6_6

• After setting to input mode, connect each pin to VSS via a resistor

(pull-down) or connect each pin to VCC via a resistor (pull-up).(2)

• After setting to output mode, leave these pins open.(1, 2)

RESET (3)

Connect to VCC via a pull-up resistor(2)

NOTE:

1. When the power-on reset function is in use.

MCU

Port P0_4 to P0_7,

P1, P3

P4_3 to P4_5,

P6_0, P6_3 to P6_6

(Input mode )

(Input mode)

(Output mode)

RESET(1)

Open

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