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AT89C5131A-RDTUM Datasheet(PDF) 151 Page - ATMEL Corporation |
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AT89C5131A-RDTUM Datasheet(HTML) 151 Page - ATMEL Corporation |
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151 / 188 page  151 4337K–USB–04/08 AT89C5130A/31A-M 22. Reset 22.1 Introduction The reset sources are: Power Management, Hardware Watchdog, PCA Watchdog and Reset input. Figure 22-1. Reset schematic 22.2 Reset Input The Reset input can be used to force a reset pulse longer than the internal reset controlled by the Power Monitor. RST input has a pull-up resistor allowing power-on reset by simply connect- ing an external capacitor to VSS as shown in Figure 22-2. Resistor value and input characteristics are discussed in the Section “DC Characteristics” of the AT89C5130A/31A-M datasheet. Figure 22-2. Reset Circuitry and Power-On Reset 22.3 Reset Output As detailed in Section “Hardware Watchdog Timer”, page 158, the WDT generates a 96-clock period pulse on the RST pin. In order to properly propagate this pulse to the rest of the applica- tion in case of external capacitor or power-supply supervisor circuit, a 1 kΩ resistor must be added as shown Figure 22-3. Power Monitor Hardware Watchdog PCA Watchdog RST Internal Reset RST VCC To internal reset RST VSS + b. Power-on Reset a. RST input circuitry |
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