Rainbow Electronics AT89C5122 - Manual (Page 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