UPD17708 datasheet(144/356 Pages) NEC

No. de pieza	UPD17708

Descripción Electrónicos	4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DEDICATED HARDWARE FOR DIGITAL TUNING SYSTEM

PDF	356 Pages

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Fabricante Electrónico	NEC [NEC]

Página de inicio	http://www.nec.com/

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144 / 356 page

µPD17704, 17705, 17707, 17708, 17709

144

12.9 External Interrupts (CE and INT0 through INT4 pins)

12.9.1 Outline of external interrupts

Figure 19-20 outlines the external interrupts.

As shown in the figure, external interrupt requests are issued at the rising or falling edges of signals input

to the INT0 through INT4 pins, and at the falling edge of the CE pin.

Whether an interrupt request is issued at the rising or falling edge of an INT pin is independently specified

by the program.

The INT0 through INT4 and CE pins are Schmitt trigger input pins to prevent malfunctioning due to noise.

These pins do not accept a pulse input of less than 100 ns.

Figure 12-20. Outline of External Interrupts

INT0

INT0 flag

IEG0 flag

Edge detection

block

Schmitt trigger

IRQ0 flag

INT1

INT1 flag

IEG1 flag

Edge detection

block

Schmitt trigger

IRQ1 flag

INT2

INT2 flag

IEG2 flag

Edge detection

block

Schmitt trigger

IRQ2 flag

INT3

INT3 flag

IEG3 flag

Edge detection

block

Schmitt trigger

IRQ3 flag

INT4

INT4 flag

IEG4 flag

Edge detection

block

Schmitt trigger

IRQ4 flag

CE flag

Edge detection

block

Schmitt trigger

IRQCE flag

INT4SEL

INT3SEL

Interrupt control block

UPD17708 Datasheet(PDF) 144 Page - NEC

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