R8C2C datasheet(113/615 Pages) RENESAS

113 / 615 page

R8C/2C Group, R8C/2D Group

7. Programmable I/O Ports

Rev.2.00

Dec 05, 2007

Page 92 of 585

REJ09B0339-0200

7.5

Unassigned Pin Handling

Table 7.82 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 7.18

Unassigned Pin Handling

Table 7.82

Unassigned Pin Handling

Pin Name

Connection

Ports P0 to P3, P4_3 to P4_5,

P5 to P8, P9_0 to P9_3

• 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)

Ports P4_6, P4_7

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

VREF

Connect to VCC

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 to P3,

P4_3 to P4_5,

P5 to P8, P9_0 to P9_3

(Input mode )

(Input mode)

(Output mode)

Port P4_6, P4_7

RESET(1)

VREF

Open

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