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ST7LITE05 Datasheet(PDF) 30 Page - STMicroelectronics |
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ST7LITE05 Datasheet(HTML) 30 Page - STMicroelectronics |
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30 / 122 page  ST7LITE0, ST7SUPERLITE 30/122 SYSTEM INTEGRITY MANAGEMENT (Cont’d) 7.5.2 Auxiliary Voltage Detector (AVD) The Voltage Detector function (AVD) is based on an analog comparison between a VIT-(AVD) and VIT+(AVD) reference value and the VDD main sup- ply voltage (VAVD). The VIT-(AVD) reference value for falling voltage is lower than the VIT+(AVD) refer- ence value for rising voltage in order to avoid par- asitic detection (hysteresis). The output of the AVD comparator is directly read- able by the application software through a real time status bit (AVDF) in the SICSR register. This bit is read only. Caution: The AVD functions only if the LVD is en- abled through the option byte. 7.5.2.1 Monitoring the VDD Main Supply The AVD voltage threshold value is relative to the selected LVD threshold configured by option byte (see section 15.1 on page 109). If the AVD interrupt is enabled, an interrupt is gen- erated when the voltage crosses the VIT+(LVD) or VIT-(AVD) threshold (AVDF bit is set). In the case of a drop in voltage, the AVD interrupt acts as an early warning, allowing software to shut down safely before the LVD resets the microcon- troller. See Figure 19. The interrupt on the rising edge is used to inform the application that the VDD warning state is over Figure 19. Using the AVD to Monitor VDD VDD VIT+(AVD) VIT-(AVD) AVDF bit 01 RESET IF AVDIE bit = 1 Vhyst AVD INTERRUPT REQUEST INTERRUPT Cleared by VIT+(LVD) VIT-(LVD) LVD RESET Early Warning Interrupt (Power has dropped, MCU not not yet in reset) 0 1 hardware INTERRUPT Cleared by reset 1 |
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