AT89C51ID2-RDTIM datasheet(32/159 Pages) ATMEL

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AT89C51ID2-RDTIM Datasheet(PDF) 32 Page - ATMEL Corporation

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AT89C51ID2

4289A–8051–09/03

Reset

Introduction

The reset sources are : Power Management, Hardware Watchdog, PCA Watchdog and

Reset input.

Figure 8. Reset schematic

Reset Input

The Reset input can be used to force a reset pulse longer than the internal reset con-

trolled by the Power Monitor. RST input has a pull-down resistor allowing power-on

reset by simply connecting an external capacitor to V

CC as shown in Figure 9. Resistor

value and input characteristics are discussed in the Section “DC Characteristics” of the

AT89C51ID2 datasheet.

Figure 9. Reset Circuitry and Power-On Reset

Power

Monitor

Hardware

Watchdog

PCA

Watchdog

RST

Internal Reset

RST

VSS

To internal reset

RST

VDD

b. Power-on Reset

a. RST input circuitry

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