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ST72F262G2B5 Datasheet(PDF) 25 Page - STMicroelectronics |
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ST72F262G2B5 Datasheet(HTML) 25 Page - STMicroelectronics |
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25 / 172 page  ST72260Gx, ST72262Gx, ST72264Gx 25/172 SYSTEM INTEGRITY MANAGEMENT (Cont’d) 6.4.2 Auxiliary Voltage Detector (AVD) The Voltage Detector function (AVD) is based on an analog comparison between a VIT- and VIT+ ref- erence value and the VDD main supply. The VIT- reference value for falling voltage is lower than the VIT+ reference value for rising voltage in order to avoid parasitic detection (hysteresis). The output of the AVD comparator is directly read- able by the application software through a real time status bit (VDF) in the SICSR register. This bit is read only. Caution: The AVD functions only if the LVD is en- abled through the option byte. 6.4.2.1 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 162). If the AVD interrupt is enabled, an interrupt is gen- erated when the voltage crosses the VIT+(AVD) or VIT-(AVD) threshold (AVDF bit toggles). 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 15. The interrupt on the rising edge is used to inform the application that the VDD warning state is over. If the voltage rise time trv is less than 256 or 4096 CPU cycles (depending on the reset delay select- ed by option byte), no AVD interrupt will be gener- ated when VIT+(AVD) is reached. If trv is greater than 256 or 4096 cycles then: – If the AVD interrupt is enabled before the VIT+(AVD) threshold is reached, then 2 AVD inter- rupts will be received: the first when the AVDIE bit is set, and the second when the threshold is reached. – If the AVD interrupt is enabled after the VIT+(AVD) threshold is reached then only one AVD interrupt will occur. Figure 15. Using the AVD to Monitor VDD VDD VIT+(AVD) VIT-(AVD) AVDF bit 0 0 RESET VALUE IF AVDIE bit = 1 Vhyst AVD INTERRUPT REQUEST INTERRUPT PROCESS INTERRUPT PROCESS VIT+(LVD) VIT-(LVD) LVD RESET Early Warning Interrupt (Power has dropped, MCU not not yet in reset) 1 1 trv VOLTAGE RISE TIME |
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