Rainbow-electronics AT89C5122 Manual do Utilizador descarregar pdf (Página 175)

175

AT8xC5122/23

4202E–SCR–06/06

Reset pin As explained in the POR section there is no need to use the reset pin as the internal

reset function at power up is ensured by the POR. Anyway, if some applications

requires a long reset, a reset controlled by the user or a reset controlled by external

superviser device, the use of the reset pin is necessary.

Long Reset As the pad integrates an internal pull-up of 10K, only an external capacitor of at least 10

µF is required to have an impact on the reset duration.

Figure 104. Long Reset

Reset Controlled by the User The external capacitor is not needed if no long reset is required.

Figure 105. Reset Controlled by the User

RST

Vcc

10 K

Internal Reset

Microcontrolleur

10 µF

RST

Vcc

10 K

Internal Reset

Microcontrolleur

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