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数据搜索系统，热门电子元器件搜索 |
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ST72521 数据表(PDF) 30 Page - STMicroelectronics |
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ST72521 数据表(HTML) 30 Page - STMicroelectronics |
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30 / 211 page  ST72521 30/211 SYSTEM INTEGRITY MANAGEMENT (Cont’d) 6.4.2.2 Monitoring a Voltage on the EVD pin This mode is selected by setting the AVDS bit in the SICSR register. The AVD circuitry can generate an interrupt when the AVDIE bit of the SICSR register is set. This in- terrupt is generated on the rising and falling edges of the comparator output. This means it is generat- ed when either one of these two events occur: –VEVD rises up to VIT+(EVD) –VEVD falls down to VIT-(EVD) The EVD function is illustrated in Figure 16. For more details, refer to the Electrical Character- istics section. Figure 16. Using the Voltage Detector to Monitor the EVD pin (AVDS bit=1) VEVD VIT+(EVD) VIT-(EVD) AVDF 0 0 1 IF AVDIE = 1 Vhyst AVD INTERRUPT REQUEST INTERRUPT PROCESS INTERRUPT PROCESS |
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