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AT89C5122D-RDRUM 数据表(PDF) 173 Page - ATMEL Corporation |
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AT89C5122D-RDRUM 数据表(HTML) 173 Page - ATMEL Corporation |
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173 / 208 page  173 AT83R5122, AT8xC5122/23 4202F–SCR–07/2008 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 103. Long Reset Reset Controlled by the User The external capacitor is not needed if no long reset is required. Figure 104. 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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