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

EXTERNAL INTERRUPTS

An external interrupt request occurs when a valid waveform (=

waveform causing the external 0 interrupt) is input to an interrupt

input pin (edge detection).

The external 0 interrupt can be controlled with the interrupt control

register I1.

Table 7 External interrupt activated condition

Name

Input pin

Valid waveform

External 0 interrupt D5/INT

Falling waveform (“H”→“L”)

Rising waveform (“L”→“H”)

Valid waveform

selection bit (I12)

0

1

D5/INT

I12

Falling

0

One-sided edge

detection circuit

1

Rising SNZI0

instruction

EXF0

Skip

External 0

interrupt

Fig. 17 External interrupt circuit structure

16

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