UPD17708 datasheet(145/356 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]

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µPD17704, 17705, 17707, 17708, 17709

12.9.2 Edge detection block

The edge detection block specifies the valid edge (rising or falling edge) of an input signal that issues the

interrupt request of INT0 to INT4 pins, by using an interrupt edge selection register.

Figure 12-21 shows the configuration and function of the interrupt edge selection register.

Figure 12-21. Configuration of Interrupt Edge Selection Register (1/2)

Caution

The external input delays about 100 ns.

Name

Flag symbol

Address

1EH

Read/Write

R/W

Interrupt edge selection 1

Power-ON reset

WDT&SP reset

CE reset

Clock stop

Interrupt pin (edge detection cricuit operates)

General-purpose port pin (edge detection cricuit stops)

Selects function of P1A2/INT3 pin

Rising edge

Falling edge

Selects input edge to issue interrupt request (INT3 pin)

Interrupt pin (edge detection cricuit operates)

General-purpose port pin (edge detection cricuit stops)

Selects function of P1A3/INT4 pin

Rising edge

Falling edge

Selects input edge to issue interrupt request (INT4 pin)

Retained

UPD17708 Datasheet(PDF) 145 Page - NEC