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AT89C5122D-RDRUM 数据表(PDF) 174 Page - ATMEL Corporation |
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AT89C5122D-RDRUM 数据表(HTML) 174 Page - ATMEL Corporation |
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174 / 208 page  174 AT83R5122, AT8xC5122/23 4202F–SCR–07/2008 Reset Controlled by an External Superviser Device As the reset pin can be forced in output by the Watch-Dog timer (WDT) or the POR/PFD features, there can be a conflict between the external superviser device and the micro- controller’s reset pin when in one side the external superviser is pulling the reset pin to VCC and in another side the WDT or POR/PFD features tries to force the reset pin to ground. Therefore, it recommended to insert a series resistor of 1.8K +/-10% or a diode (1N4148 for instance) between the external superviser device and the reset pin as detailed in the following figures. Figure 105. Use of an External Serial Resistor Figure 106. Use of an External Diode RST Vcc 10 K Microcontrolleur 1.8 K Superviser device To other on-board circuitry Power Fail Detector Watchdog Timer Power On Reset RST Vcc 10 K Microcontrolleur Superviser device To other on-board circuitry Power Fail Detector Watchdog Timer Power On Reset 1N4148 |
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