R8C18 datasheet(25/257 Pages) RENESAS

25 / 257 page

R8C/18 Group, R8C/19 Group

1. Overview

Rev.1.30

Apr 14, 2006

Page 10 of 233

REJ09B0222-0130

1.6

Pin Functions

Table 1.5 lists Pin Functions, Table 1.6 lists Pin Name Information by Pin Number of PLSP0020JB-A,

PRDP0020BA-A packages, and Table 1.7 lists Pin Name Information by Pin Number of PWQN0028KA-

B package.

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 2.7 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 comparator

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.

Main clock input

XIN

These pins are provided for main 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.

Main clock output

XOUT

INT interrupt

INT0, INT1, INT3

IINT interrupt input pins

Key input interrupt

KI0 to KI3

Key input interrupt input pins

Timer X

CNTR0

I/O

Timer X I/O pin

CNTR0

Timer X output pin

Timer Z

TZOUT

Timer Z output pin

Timer C

TCIN

Timer C input pin

CMP0_0 to CMP0_2,

CMP1_0 to CMP1_2

Timer C output pins

Serial interface

CLK0

I/O

Transfer clock I/O pin

RXD0, RXD1

Serial data input pins

TXD0, TXD1

Serial data output pins

Reference voltage

input

VREF

Reference voltage input pin to comparator

Comparator

AN8 to AN11

Analog input pins to comparator

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 register, allowing each pin in the port to

be directed for input 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_3 also function as LED drive ports.

Input port

P4_2, P4_6, P4_7

Input-only ports

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