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

XIN

XCIN

MR0

0

1

ORCLK

CARRY

Frequency

dividing circuit

(divided by 4)

MR3

1

0

INSTCK W13

0

Frequency

dividing circuit

1

(divided by 3)

Prescaler

W12

1/4

0

1/8

1

STCK

12

W11,W10

00, 01

10

11

W20 (Note 1)

0

1

Timer 1 (8)

(TAB1)

Reload register R1 (8)

(T1AB) (Note 2)

Register B Register A

T1F

ORCLK

Timer 1

interrupt

Carrier wave

output control

ORCLK

STCK

W31

1

0

W30 (Note 1)

0

Count

source

1

Timer LC (4)

Reload register LC (4)

12

To port CARR

LCD clock

W23 (Note 3)

0

1 Count

source

WRST instruction

Reset signal

S

WEF Q

R

0 1 2 3 4 5 6 7 8 9 10 11 12 13

Timer 2

WDF

W22, W21

00

D

Q

T

System

reset

01

Not available

10,11

T2F

Timer 2

interrupt

Notes 1: Count source is stopped by setting to “0.”

2: When the T1AB instruction is executed after

setting W20 to “1,” data is written only to

reload register R1.

3: When the contents of W23 changes from “0”

to “1,” the count value of timer 2 is initialized.

Fig. 19 Timers structure

19

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