Atmel C51 Ficha de datos descargar pdf (Pagina 6)

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7764A–8051–11/07

1.2.2 How to drive the RST pin according to the features implemented on the device

This procedure is only applicable to Active High reset pins. However, this procedure can be eas-

ily adapted for microcontrollers with Active Low Reset pins.

1.2.2.1 POR not implemented

When the POR is not implemented, it is necessary to implement external components to assure

a correct reset of the MCU.

a) Using an external capacitor

Read application note “ How to calculate the capacitor of the reset input of a C51 microcontrol-

ler” (doc 4284).

Internal pull-up

External Pull-up

RST

Internal Reset

Microcontroller

C

R

VCC

RST

Internal Reset

Microcontroller

C

R

VCC

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