M34551 View Datasheet(PDF) - Renesas Electronics

Part Name

Description

Manufacturer

M34551

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for INFRARED REMOTE CONTROL TRANSMITTER

Renesas Electronics 

MITSUBISHI MICROCOMPUTERS

4551 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for

INFRARED REMOTE CONTROL TRANSMITTER

PIN DESCRIPTION

Pin

Name

VDD

Power supply

VSS

Ground

CNVSS

CNVSS

RESET

Reset input

XIN

XOUT

D0–D4

D5/INT

Main clock input

Main clock output

Output port D

Output port D

D6/XCIN

Output port D

D7/XCOUT Output port D

P00–P03 I/O port P0

P10–P13 I/O port P1

P20/SEG16– Input port P2

P23/SEG19

CARR

Carrier wave output

for remote control

SEG0–SEG15 Segment output

COM0–COM3 Common output

Input/Output

—

—

Input

I/O

Input

Output

Output

I/O

I/O

Output

I/O

I/O

I/O

Output

Output

Output

Function

Connected to a plus power supply.

Connected to a 0 V power supply.

Connect CNVSS to VSS and apply “L” (0V) to CNVSS certainly.

An N-channel open-drain I/O pin for a system reset. A pull-up resistor is built-in

this pin. When the watchdog timer causes the system to be reset or the low-

supply voltage is detected, the RESET pin outputs “L” level.

I/O pins of the main clock generating circuit. A ceramic resonator can be connected

between XIN pin and XOUT pin. A feedback resistor is built-in between them.

Each pin of port D has an independent 1-bit wide output function. The output

structure is N-channel open-drain.

1-bit output port. Port D5 is also used as an INT input pin. When D5/INT pin is

used as the INT input pin, set the output latch to “1.” The output structure is N-

channel open-drain.

Each pin of port D has an independent 1-bit output function. Ports D6 and D7 are

also used as pins XCIN and XCOUT for the sub-clock generating circuit, respectively.

When pins D6/XCIN and D7/XCOUT are used as the pins for the sub-clock generating

circuit, a 32.0 kHz quartz-crystal oscillator can be connected between XCIN pin

and XCOUT pin. A feedback resistor is built-in between them.

4-bit I/O port. It can be used as an input port when the output latch is set to “1.”

The output structure is N-channel open-drain. Every pin of the ports has a key-on

wakeup function and a pull-up function.

4-bit I/O port. It can be used as an input port when the output latch is set to “1.”

The output structure is N-channel open-drain. Every pin of the ports has a key-on

wakeup function and a pull-up function. Both functions can be switched by software.

4-bit input port. Ports P20–P23 are also used as the segment output pins SEG16–

SEG19, respectively.

Carrier wave output pin for remote control transmit. The output structure is the

CMOS circuit.

LCD segment output pins.

LCD common output pins. Pins COM0 and COM1 are used at 1/2 duty, pins COM0–

COM2 are used at 1/3 duty and pins COM0–COM3 are used at 1/4 duty.

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