M3885 datasheet(4/103 Pages) RENESAS

4 / 103 page

3885 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

VCC, VSS

PIN DESCRIPTION

Functions

Name

•Apply voltage of 3.0 V ±10 % to Vcc, and 0 V to Vss.

•Connected to VSS.

•In the flash memory version, this pin functions as the VPP power source input pin.

•Reference voltage input pin for A-D and D-A converters.

•Analog power source input pin for A-D and D-A converters.

•Connect to VSS.

•Reset input pin for active “L”.

•Input and output pins for the clock generating circuit.

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

the oscillation frequency.

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

pin open.

•8-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 or N-channel open-drain output structure.

•8-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 or N-channel open-drain output structure.

•8-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.

•P24 to P27 (4 bits) are enabled to output large current for LED drive.

•8-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.

•These pins function as key-on wake-up and compara-

tor input.

•These pins are enabled to control pull-up.

Power source

Table 1 Pin description (1)

Function except a port function

•Comparator reference power source

input pin

Reference voltage

Analog power source

Clock input

Clock output

I/O port P0

I/O port P1

VREF

AVSS

CNVSS input

RESET

Reset input

XIN

XOUT

P00–P07

P10–P17

P21–P27

•Key-on wake-up input pins

•Comparator input pins

•PWM output pins

•Key-on wake-up input pins

•Comparator input pins

I/O port P2

I/O port P3

P30/PWM00

P31/PWM10

P32–P37

CNVSS

P20/CMPREF

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