7549 查看數據表（PDF） - Renesas Electronics

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7549

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Renesas Electronics 

7549 Group

PIN DESCRIPTION

Table 2 Pin description

Pin

Name

Function

Function except a port function

VCC,VSS

Power source

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

CNVSS

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

P02(LED2)

P03(LED3)/CAP0

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

Interrupt input pin

Capture input pin

P04(LED4)/RXD

P05(LED5)/TXD

P06(LED6)/SCLK

P07(LED7)/SRDY

•CMOS 3-state output structure

Serial interface function pin

•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.

P10/AN0/KEY0/CMP0

P11/AN1/KEY1/CMP1

P12/AN2/KEY2/CMP2

P13/AN3/KEY3/T2OUT

I/O port P1

P14/AN4/KEY4

P15/AN5/KEY5

P16/AN6/KEY6

P17/AN7/KEY7

•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

pin

Timer 2

output

pin

P20/XOUT/XCOUT

I/O port P2

P21/XIN/XCIN (Note)

•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

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.

Rev.2.02 Mar 31, 2009 Page 6 of 81

REJ03B0202-0202

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