AT89C5122 ATMEL [ATMEL Corporation], AT89C5122 Datasheet - Page 175

• Manufacturer Part Number: AT89C5122
• Description: MICROCONTROLLER WITH USB AND SMART CARD READER INTERFACES
• Manufacturer: ATMEL [ATMEL Corporation]

Reset pin
Long Reset
Reset Controlled by the User
4202D–SCR–06/05
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.
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
The external capacitor is not needed if no long reset is required.
Figure 105. Reset Controlled by the User
10 µF
RST
RST
Vcc
Vcc
10 K
10 K
Microcontrolleur
Microcontrolleur
Internal Reset
Internal Reset
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