R8CSLASH13 datasheet(162/224 Pages) RENESAS

162 / 224 page

Rev.1.20

Jan 27, 2006

page 151 of 205

REJ09B0111-0120

R8C/13 Group

15. Programmable I/O Ports

Pin nameConnection

Ports P0, P1, P30 to

P33, P37 P45

AVCC, VREF

AVSS

•After setting for input mode, connect every pin to VSS via a resistor(pull-down)

or connect every pin to VCC via a resistor(pull-up)

•Set to output mode and leave these pins open(1, 2)

Connect to VCC

Connect to VSS

NOTES:

1. When these ports are set for output mode and left open, they remain input mode until they are set for

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

current may increase for the time the ports remain input mode.

The content of the direction registers may change due to noise or runaway caused by noise. In order to

enhance program reliability, set the direction registers periodically by a program.

2. Connect these unassigned pins to the microcomputer using the shortest wire length (within 2 cm)

possible.

3. When power-on reset is used.

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

Ports P46, P47

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

RESET(3)

Table 15.24 Unassigned Pin Handling

15.3 Unassigned Pin Handling

Table 15.24 lists the handling of unassigned pins.

Figure 15.10 Unassigned Pin Handling

NOTES:

1. When power-on reset function is used.

Port P0, P1,

P30 to P33, P37, P45

Microcomputer

(Input mode)

(Output mode)

Open

Port P46, P47

RESET

AVCC/VREF

AVSS

(1)

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