AT89C5122D-RDRUM datasheet(174/208 Pages) ATMEL

Teilenummer	AT89C5122D-RDRUM

Bauteilbeschribung	C51 Microcontroller with USB and Smart Card Reader Interfaces

PDF	208 Pages

Scroll/Zoom	100%

Hersteller	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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174 / 208 page

174

AT83R5122, AT8xC5122/23

4202F–SCR–07/2008

Reset Controlled by an

External Superviser Device

As the reset pin can be forced in output by the Watch-Dog timer (WDT) or the POR/PFD

features, there can be a conflict between the external superviser device and the micro-

controller’s reset pin when in one side the external superviser is pulling the reset pin to

VCC and in another side the WDT or POR/PFD features tries to force the reset pin to

ground. Therefore, it recommended to insert a series resistor of 1.8K +/-10% or a diode

(1N4148 for instance) between the external superviser device and the reset pin as

detailed in the following figures.

Figure 105.

Use of an External Serial Resistor

Figure 106.

Use of an External Diode

RST

Vcc

10 K

Microcontrolleur

1.8 K

Superviser

device

To other on-board

circuitry

Power Fail

Detector

Watchdog

Timer

Power On

Reset

RST

Vcc

10 K

Microcontrolleur

Superviser

device

To other on-board

circuitry

Power Fail

Detector

Watchdog

Timer

Power On

Reset

1N4148

AT89C5122D-RDRUM Datenblatt(PDF) 174 Page - ATMEL Corporation

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