The HLVD module can be configured to monitor the device voltage. This is useful in battery monitoring applications.
Complete control of the HLVD module is provided through the HLVDCON0 and HLVDCON1 registers.
The module’s block diagram is shown in the figure below.
Since the HLVD can be software enabled through the HLVDEN bit, setting and clearing the enable bit does not produce a false HLVD event glitch. Each time the HLVD module is enabled, the RDY bit can be used to detect when the module is stable and ready to use.
The INTH and INTL bits determine the overall operation of the module. When INTH is set, the module monitors for rises in VDD above the trip point set by the bits. When INTL is set, the module monitors for drops in VDD below the trip point set by the SEL bits. When both the INTH and INTL bits are set, any changes above or below the trip point set by the SEL bits can be monitored.
The OUT bit can be read to determine if the voltage is greater than or less than the selected trip point.