3819 datasheet(18/218 Pages) RENESAS

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3819 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

•Reset input pin for active “L”

VCC, VSS

PIN DESCRIPTION

Name

Function

Function except a port function

Power source

•Apply voltage of 4.0 to 5.5 V to VCC, and 0 V to VSS.

•Applies voltage supplied to pull-down resistors of ports P0, P1, P20–P23, P3, and P9.

•Reference voltage input pin for A-D converter and D-A converter

•GND input pin for A-D converter and D-A converter

•Connect AVSS to VSS.

•Input and output pins for the main clock generating circuit

•Feedback resistor is built in between XIN pin and XOUT pin.

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

set oscillation frequency.

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

open.

•This clock is used as the oscillating source of system clock.

•8-bit output port

•This port builds in pull-down resistor between

port P0 and the VEE pin.

•At reset this port is set to VEE level.

•The high-breakdown-voltage P-channel

open-drain

VEE

VREF

AVSS

RESET

XIN

XOUT

P00/SEG32/

DIG0–P07/

SEG39/DIG7

P10/SEG40/

DIG8–P17/

DIG15

P20/DIG16–

P23/DIG19

P24–P27

•8-bit output port with the same function as

port P0

•4-bit output port with the same function as

port P0

•4-bit I/O port

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

•At reset this port is set to input mode.

•TTL input level

•CMOS 3-state output

P30/SEG24–

P37/SEG31

P40/INT0,

P45/INT1/

ZCR

P42/INT2–

P44/INT4

P41

P46/T1OUT,

P47/T3OUT

Pull-down

Power source

Analog reference

voltage

Reset input

Analog power source

Clock input

Clock output

Output port P0

Output port P1

Output port P2

I/O port P2

Output port P3

Input port P4

I/O port P4

•8-bit output port with the same function as

port P0

•2-bit input port

•CMOS compatible input level

•6-bit CMOS I/O port with the same function

as ports P24–P27

•CMOS compatible input level

•CMOS 3-state output

FLD automatic display pins

External interrupt input pins

A zero cross detection circuit input pin (P45)

Timer output pins

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