D17133CS datasheet(33/289 Pages) NEC

номер детали	D17133CS

подробное описание детали	4-BIT SINGLE-CHIP MICROCONTROLLER

PDF	289 Pages

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производитель	NEC [NEC]

домашняя страница	http://www.nec.com/

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CHAPTER 2

PIN FUNCTIONS

2.4 CAUTIONS ON USE OF THE RESET AND INT PINS (in Normal Operation Mode only)

In addition to the function described in 2.1 PIN FUNCTIONS, the RESET pin and the INT pin have the function

(for IC testing only) of setting test mode for testing the internal operation of the

µPD17120 subseries.

If a voltage exceeding the VDD is applied to either of these pins, test mode is set. Therefore, adding a noise

exceeding VDD even in normal operation may result in placing the pin in test mode, thus impeding normal operation.

For example, if the RESET or INT pin wires are laid out too long, wiring noise is added to these pins, thus causing

the above problem. Therefore, make sure that the wires are laid down in such a manner that such inter-wire noises

are suppressed as much as possible. If noise is still a problem, take noise countermeasures based on external parts

as shown in the illustrations below.

•

Connecting a Diode of Small VF between VDDs

•

Connecting a Capacitor between VDDs

VDD

RESET, INT

VDD

Diode whose

VF is small

VDD

RESET, INT

VDD

D17133CS датащи(PDF) 33 Page - NEC