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ST7LITEUS5 数据表(PDF) 45 Page - STMicroelectronics |
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ST7LITEUS5 数据表(HTML) 45 Page - STMicroelectronics |
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45 / 136 page  Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) ST7LITEUS2, ST7LITEUS5 Interrupts 45/136 7.4.2 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 supply voltage (VAVD). The VIT-(AVD) reference value for falling voltage is lower than the VIT+(AVD) reference value for rising voltage in order to avoid parasitic detection (hysteresis). The output of the AVD comparator is directly readable by the application software through a real time status bit (AVDF) in the SICSR register. This bit is read only. Monitoring the VDD main supply The AVD threshold is selected by the AVD[1:0] bits in the AVDTHCR register. If the AVD interrupt is enabled, an interrupt is generated when the voltage crosses the VIT+(AVD) 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 microcontroller. See Figure 17. The interrupt on the rising edge is used to inform the application that the VDD warning state is over Note: Make sure the right combination of LVD and AVD thresholds is used as LVD and AVD levels are not correlated. Refer to Table 47 on page 95 and Table 48 on page 96 for more details. Figure 17. 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 Obsolete Product(s) - Obsolete Product(s) |
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