AT89C51ED2-RDTIM datasheet(27/137 Pages) ATMEL

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AT89C51ED2-RDTIM 데이터시트(PDF) 27 Page - ATMEL Corporation

27 / 137 page

AT89C51RD2/ED2

4235E–8051–04/04

Reset

Introduction

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

Reset input.

Figure 9. 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 VCC as shown in Figure 10. Resistor

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

AT89C51RD2/ED2 datasheet.

Figure 10. 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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