M34551 View Datasheet(PDF) - MITSUBISHI ELECTRIC

Part Name

Description

Manufacturer

M34551

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

MITSUBISHI ELECTRIC  

MITSUBISHI MICROCOMPUTERS

4551 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for

INFRARED REMOTE CONTROL TRANSMITTER

PERFORMANCE OVERVIEW

Parameter

Function

Number of basic instructions

92

Minimum instruction execution time 1.5 µs (f(XIN) = 8.0 MHz:system clock = f(XIN)/4: VDD = 5.0 V)

Memory sizes ROM M34551M4 4096 words ! 10 bits

M34551E8 8192 words ! 10 bits

RAM

280 words ! 4 bits (LCD RAM 20 words ! 4 bits included)

Input/Output D0–D7 Output Eight independent output ports

ports

P00–P03 I/O

4-bit I/O port; each pin is equipped with a pull-up function.

P10–P13 I/O

4-bit I/O port; each pin is equipped with a pull-up function.

P20–P23 Input

4-bit input port

CARR Output 1-bit output port (CMOS output)

Timers

Timer 1

8-bit timer with a reload register

Timer 2/

14-bit timer/

Watchdog timer Fixed dividing frequency timer

Timer LC

4-bit timer with a reload register

Interrupt

Sources

3 (one for external and two for timer)

Nesting

1 level

Subroutine nesting

8 levels (however, only 7 levels can be used when an interrupt is used or the TABP p instruction

is executed)

LCD

Selective bias value 1/2, 1/3 bias

Selective duty value 2, 3, 4 duty

Common output 4

Segment output 20

Internal resistor for 200 kΩ ! 3

power supply

Device structure

CMOS silicon gate

Package

48-pin plastic molded QFP

Operating temperature range

–20 °C to 70 °C

Supply voltage

2.2 V to 5.5 V (One Time PROM version: 2.5 V to 5.5 V)

Power

at active

2.5 mA (f(XIN) = 8.0 MHz system clock = f(XIN)/4, VDD=5 V)

dissipation at clock operating 27.5 µA (at main clock oscillation stop, sub-clock oscillation frequency: 32.0 kHz, VDD=5 V)

(typical value) at RAM back-up 0.1 µA (at main clock oscillation stop, sub-clock oscillation stop, Ta=25 °C, VDD=5V)

DEFINITION OF CLOCK AND CYCLE

q System clock (STCK)

The system clock is the basic clock for controlling this product.

The system clock can be selected by bits 0 and 3 of the clock

control register MR as shown in the table below.

Table Selection of system clock

Register MR

MR3 MR0

System clock (STCK)

0

0 f(XIN)

0

1 f(XCIN)

1

0 f(XIN)/4

1

1 f(XCIN)/4

Note: f(XIN)/4 is selected immediately after system is released

from reset.

q Instruction clock (INSTK)

The instruction clock is the standard clock for controlling CPU.

The instruction clock is a signal derived from dividing the

system clock by 3. The one cycle of the instruction clock is

equivalent to the one machine cycle.

q Machine cycle

The machine cycle is the standard cycle required to execute

the instruction.

3

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