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DM163006 Datasheet(PDF) 206 Page - Microchip Technology |
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DM163006 Datasheet(HTML) 206 Page - Microchip Technology |
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206 / 320 page  PIC18C601/801 DS39541A-page 206 Advance Information 2001 Microchip Technology Inc. 18.2.1 REFERENCE VOLTAGE SET POINT The Internal Reference Voltage of the LVD module may be used by other internal circuitry (the programmable Brown-out Reset). If these circuits are disabled (lower current consumption), the reference voltage circuit requires time to become stable before a low voltage con- dition can be reliably detected. This time is invariant of system clock speed. This start-up time is specified in electrical specification parameter #36. The low voltage interrupt flag will not be enabled until a stable reference voltage is reached. Refer to the waveform in Figure 18-3. 18.2.2 CURRENT CONSUMPTION When the module is enabled, the LVD comparator and voltage divider are enabled and will consume static cur- rent. The voltage divider can be tapped from multiple places in the resistor array. Total current consumption, when enabled, is specified in electrical specification parameter #D022B. 18.3 External Analog Voltage Input The LVD module has an additional feature that allows the user to supply the trip point voltage to the module from an external source (the LVDIN pin). The LVDIN pin is used as the trip point when the LVDL3:LVDL0 bits equal ’1111’. This state connects the LVDIN pin volt- age to the comparator. The other comparator input is connected to an internal reference voltage source. 18.4 Operation During SLEEP When enabled, the LVD circuitry continues to operate during SLEEP. If the device voltage crosses the trip point, the LVDIF bit will be set and the device will wake- up from SLEEP. Device execution will continue from the interrupt vector address, if interrupts have been globally enabled. 18.5 Effects of a RESET A device RESET forces all registers to their RESET state. This forces the LVD module to be turned off. |
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