R8C2K datasheet(28/471 Pages) RENESAS

28 / 471 page

R8C/2K Group, R8C/2L Group

1. Overview

Rev.1.10

Dec 21, 2007

Page 11 of 450

REJ09B0406-0110

1.5

Pin Functions

Table 1.8 lists 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

Item

Pin Name

I/O Type

Description

Power supply input

VCC, VSS

−

Apply 2.2 V 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 XIN pin and leave the XOUT pin open.

XIN clock output

XOUT

INT interrupt input

INT0, INT1, INT3

INT interrupt input pins.

INT0 is timer RB, timer RC and timer RD input pins.

Key input interrupt

KI0 to KI3

Key input interrupt input pins

Timer RA

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

Timer RC I/O pins

Timer RD

TRDIOA0, TRDIOA1,

TRDIOB0, TRDIOB1,

TRDIOC0, TRDIOC1,

TRDIOD0, TRDIOD1

I/O

Timer RD I/O pins

TRDCLK

External clock input pin

Serial interface

CLK0, CLK2

I/O

Transfer clock I/O pins

RXD0, RXD2

Serial data input pins

TXD0, TXD2

Serial data output pins

Reference voltage

input

VREF

Reference voltage input pin to A/D converter

A/D converter

AN2, AN4 to AN11

Analog input pins to A/D converter

I/O port

P0_0 to P0_3, P0_5,

P1_0 to P1_7,

P2_0 to P2_7,

P3_3 to P3_5,

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.

P2_0 to P2_7 also function as LED drive ports.

Input port

P4_2, P4_6, P4_7

Input-only ports

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