4250 Просмотр технического описания (PDF) - MITSUBISHI ELECTRIC

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4250

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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MITSUBISHI MICROCOMPUTERS

4250 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

EXTERNAL INTERRUPTS

The 4250 Group has an external interrupt. An external interrupt

request occurs when a valid waveform is input to an interrupt

input pin (edge detection).

The external interrupt can be controlled with the key-on wakeup

control register K0.

Table 7 External interrupt activated condition

Name

External interrupt

Input pin

G0/INT

Valid waveform

Falling waveform (“H”→“L”)

Rising waveform (“L”→“H”)

Valid waveform selection bit(K02)

1

0

External interrupt

Key-on wakeup

input

EXF0

Register A

One-sided

edge detection

circuit

K02

Rising

0

1

Falling

IAG instruction

Pull-up transistor

PU00

(Note)

G0/INT pin

A0

DQ

OGA instruction T

Fig. 17 External interrupt circuit structure

Note:

This symbol represents a

parasitic diode.

Applied potential to port G0 must be VDD

or less.

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