7549 datasheet(6/73 Pages) RENESAS

6 / 73 page

Rev.2.00

Mar 05, 2007

Page 6 of 70

REJ03B0202-0200

7549 Group

PRELIMINARY

Notice: This is not a final specification.

Some parametric limits are subject to change.

PIN DESCRIPTION

NOTE:

1. The oscillation circuit is built in the P20/XOUT/XCOUT pin and the P21/XIN/XCIN pin. When the Vcc of the microcomputer is lower than

the operation lower bound voltage even if these pins are used as I/O ports, the oscillation circuit is connected and undefined values

may be output from these pins.

Table 2

Pin description

Name

Function

Function expect a port function

VCC,VSS

Power source

Apply voltage of 1.8 to 5.5 V to Vcc, and 0 V to Vss.

CNVSS

Controls the operation mode of the chip. Connected to VSS.

RESET

Reset input

Reset input pin for active “L”

P00(LED0)/INT0

P01(LED1)/INT1

I/O port P0

•8-bit I/O port.

•I/O direction register allows each pin to be individu-

ally programmed as either input or output.

•CMOS compatible input level

•CMOS 3-state output structure

•Whether a built-in pull-up resistor is to be used or not

can be determined by program.

•High drive capacity for LED drive port can be

selected by program.

Interrupt input pin

P02(LED2)

P03(LED3)/CAP0

Capture input pin

P04(LED4)/RXD

P05(LED5)/TXD

P06(LED6)/SCLK

P07(LED7)/SRDY

Serial interface function pin

P10/AN0/KEY0/CMP0

P11/AN1/KEY1/CMP1

P12/AN2/KEY2/CMP2

I/O port P1

•8-bit I/O port.

•I/O direction register allows each pin to be individu-

ally programmed as either input or output.

•CMOS compatible input level

•CMOS 3-state output structure

•Whether a built-in pull-up resistor is to be used or not

can be determined by program.

Input pins

for A/D

converter

Key-input

(key-on

wake up

interrupt

input) pin

Compare

output

P13/AN3/KEY3/T2OUT

Timer 2

output

P14/AN4/KEY4

P15/AN5/KEY5

P16/AN6/KEY6

P17/AN7/KEY7

P20/XOUT/XCOUT

P21/XIN/XCIN (Note)

I/O port P2

•2-bit I/O port. (P20/XOUT/XCOUT is only for output)

•I/O direction register allows each pin to be individu-

ally programmed as either input or output.

•CMOS compatible input level

•CMOS 3-state output structure

•Function set ROM allows pins to be used as clock

pins.

Pins XIN and XOUT, or pins XCIN

and XCOUT, can be used as clock

pins by connecting a ceramic

resonator, crystal oscillator, or 32

kHz crystal oscillator between

them. Alternately, an external

clock may be input to the

P20/XOUT/XCOUT pin. In this case,

the P21/XIN/XCIN pin can be used

as an I/O port.

P30, P31

I/O port P3

•2-bit I/O port.

•I/O direction register allows each pin to be individually programmed as either input or

output.

•CMOS compatible input level

•CMOS 3-state output structure

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