M34280E1FP View Datasheet(PDF) - MITSUBISHI ELECTRIC

Part Name

Description

Manufacturer

M34280E1FP

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

MITSUBISHI ELECTRIC  

MITSUBISHI MICROCOMPUTERS

4280 Group

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

The 4280 Group timer consists of the following circuit.

• Timer 1 : 8-bit programmable timer

This timer can be controlled with the timer control register V1.

Timer 1 function is described below.

Table 3 Function related timer

Circuit

Structure

Timer 1

8-bit programmable

binary down counter

Count source

Frequency

dividing ratio

Use of output signal

• Carrier generating circuit 1 to 256

• Carrier wave output control

output (CARRY)

• Bit 5 of watchdog timer

Control

register

V1

V11

CARRY 0

1

V10 (Note 1)

0

1

Timer 1 (8)

Reload register R1 (8)

(TAB1)

(T1AB)(Note 2)

Register B Register A

V12

SNZT1 instruction

T1F

DQ

TR

V10

Carrier wave output control signal

XIN

CCK instruction

Initializing signal

(Note 3)

Frequency

divider

(divided by 8)

S Q Synchronous

circuit

R

Initializing signal (Note 3)

INSTCK

14-bit timer (WDT)

0

5

13

STCK (System clock)

Frequency

divider

(divided by 4)

WDF1 WDF2

INSTCK

(Instruction clock)

System reset

WRST instruction

Initializing signal

(Note 3)

Notes 1: Counting is stopped by clearing to “0.”

2: When the T1AB instruction is executed after V10 is set to “1,”

writing is performed only to reload register R1.

3: The initializing signal is output at reset or RAM back-up mode.

: Data is automatically set from a reload register

when timer 1 underflows (auto-reload function).

Fig. 13 Timers structure

MITSUBISHI

ELECTRIC

11

Share Link: