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

No. de pieza AT89C51ED2-RDTIM
Descripción Electrónicos  8-bit Flash Microcontroller
PDF  137 Pages
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Fabricante Electrónico  ATMEL [ATMEL Corporation]
Página de inicio  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51ED2-RDTIM Datasheet(HTML) 27 Page - ATMEL Corporation

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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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