R8C34U_15 datasheet(13/95 Pages) RENESAS

13 / 95 page

R8C/34U Group, R8C/34K Group

1. Overview

R01DS0113EJ0110 Rev.1.10

Page 13 of 91

Jun 15, 2011

1.5

Pin Functions

Tables 1.8 and 1.9 list Pin Functions.

I: Input

O: Output

I/O: Input and output

Note:

1. Refer to the oscillator manufacturer for oscillation characteristics.

Table 1.8

Pin Functions (1)

Item

Pin Name

I/O Type

Description

Power supply input VCC, VSS

—

Apply 1.8 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. (1)

To use an external clock, input it to the XOUT pin and leave

the XIN pin open.

XIN clock output

XOUT

I/O

INT interrupt input

INT0 to INT4

INT interrupt input pins.

Key input interrupt

KI0 to KI3

Key input interrupt input pins.

Timer RA

TRAIO

I/O

Timer RA I/O pin.

TRAO

Timer RA output 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

Timer RC I/O pins.

Timer RF

TRFI

Timer RF input pins.

TRFO00, TRFO10,

TRFO01, TRFO02

Timer RF output pins.

Serial interface

CLK0, CLK1, CLK2,

CLK3

I/O

Transfer clock I/O pins.

RXD0, RXD1, RXD2,

RXD3

Serial data input pins.

TXD0, TXD1, TXD2,

TXD3

Serial data output pins.

CTS2

Transmission control input pin.

RTS2

Reception control output pin.

SSU

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.

I2C bus

SCL

I/O

Clock I/O pin.

SDA

I/O

Data I/O pin.

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