M37544G2SP datasheet(7/68 Pages) RENESAS

7 / 68 page

7544 Group

Rev.1.04

2004.06.08

page 7 of 66

REJ03B0012-0104Z

PIN DESCRIPTION

Table 1 Pin description

Function

•Apply voltage of 4.0 to 5.5 V to Vcc, and 0 V to Vss.

•Reference voltage input pin for A/D converter

•Chip operating mode control pin, which is always connected to Vss.

•Reset input pin for active “L”

•Input and output pins for main clock generating circuit

•Connect a ceramic resonator or quartz-crystal oscillator between the XIN and XOUT pins.

•For using RC oscillator, short between the XIN and XOUT pins, and connect the capacitor and resistor.

•If an external clock is used, connect the clock source to the XIN pin and leave the XOUT pin open.

• When the on-chip oscillator is selected as the main clock, connect XIN pin to VCC and leave XOUT open.

Function expect a port function

Name

Power source

Analog reference

voltage

CNVss

Reset input

Clock input

I/O port P0

I/O port P1

Vcc, Vss

VREF

CNVss

______

RESET

XIN

P00/CNTR1

P01

P02

P03/TXOUT

P04–P07

• Key-input (key-on wake up

interrupt input) pins

• Timer X and timer A function

•8-bit I/O port.

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

grammed as either input or output.

•CMOS compatible input level

•CMOS 3-state output structure

•P0 can output a large current for driving LED.

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

termined by program.

•5-bit I/O port

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

grammed as either input or output.

•CMOS compatible input level

•CMOS 3-state output structure

•CMOS/TTL level can be switched for P10 and P12

•6-bit I/O port having almost the same function as P0

•CMOS compatible input level

•CMOS 3-state output structure

P10/RxD

P11/TxD

P12/SCLK

____

P13/SRDY

P14/CNTR0

P20/AN0–P25/AN5

P30–P33

P34/INT1

P37/INT0

I/O port P2

I/O port P3

• Serial I/O function pin

• Timer X function pin

• Input pins for A/D converter

• Interrupt input pins

•6-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/TTL level can be switched for P34 and P37).

•CMOS 3-state output structure

•P3 can output a large current for driving LED.

XOUT

Clock output

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

termined by program.

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