R29 datasheet(27/473 Pages) RENESAS

27 / 473 page

R8C/28 Group, R8C/29 Group

1. Overview

Rev.2.10

Sep 26, 2008

Page 8 of 441

REJ09B0279-0210

1.6

Pin Functions

Table 1.5 lists Pin Functions.

I: Input

O: Output

I/O: Input and output

Table 1.5

Pin Functions

Type

Symbol

I/O Type

Description

Power supply input

VCC, VSS

Apply 2.2 to 5.5 V (J, K version are 2.7 to 5.5 V) to the VCC

pin. Apply 0 V to the VSS pin.

Analog power

supply input

AVCC, AVSS

Power supply for the A/D converter.

Connect a capacitor between AVCC and AVSS.

Reset input

RESET

Input “L” on this pin resets the MCU.

MODE

Connect this pin to VCC via a resistor.

XIN clock input

XIN

These pins are provided for XIN clock generation circuit I/O.

Connect a ceramic resonator or a crystal oscillator between

the XIN and XOUT pins. To use an external clock, input it to

the XIN pin and leave the XOUT pin open.

XIN clock output

XOUT

XCIN clock input

(N, D version)

XCIN

These pins are provided for XCIN clock generation circuit I/O.

Connect a crystal oscillator between the XCIN and XCOUT

pins. To use an external clock, input it to the XCIN pin and

leave the XCOUT pin open.

XCIN clock output

(N, D version)

XCOUT

INT interrupt input

INT0, INT1, INT3

IINT interrupt input pins

Key input interrupt

KI0 to KI3

Key input interrupt input pins

Timer RA

TRAO

Timer RA output pin

TRAIO

I/O

Timer RA I/O pin

Timer RB

TRBO

Timer RB output pin

Timer RC

TRCCLK

External clock input pin

TRCTRG

External trigger input pin

TRCIOA, TRCIOB,

TRCIOC, TRCIOD

I/O

Sharing output-compare output / input-capture input / PWM /

PWM2 output pins

Serial interface

CLK0

I/O

Clock I/O pin

RXD0, RXD1

Receive data input pin

TXD0, TXD1

Transmit data output pin

I2C bus interface

SCL

I/O

Clock I/O pin

SDA

I/O

Data I/O pin

Clock synchronous

serial I/O with chip

select

SSI

I/O

Data I/O pin

SCS

I/O

Chip-select signal I/O pin

SSCK

I/O

Clock I/O pin

SSO

I/O

Data I/O pin

Reference voltage

input

VREF

Reference voltage input pin to A/D converter

A/D converter

AN8 to AN11

Analog input pins to A/D converter

I/O port

P1_0 to P1_7,

P3_3 to P3_5, P3_7,

P4_5

I/O

CMOS I/O ports. Each port has an I/O select direction

or output individually.

Any port set to input can be set to use a pull-up resistor or not

by a program.

P1_0 to P1_7 also function as LED drive ports (N, D version).

Input port

P4_2, P4_6, P4_7

Input-only ports

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