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PIC18LF4331 Datasheet(PDF) 261 Page - Microchip Technology |
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PIC18LF4331 Datasheet(HTML) 261 Page - Microchip Technology |
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261 / 392 page  2010 Microchip Technology Inc. DS39616D-page 261 PIC18F2331/2431/4331/4431 22.5 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. 22.6 Effects of a Reset A device Reset forces all registers to their Reset state. This forces the LVD module to be turned off. 22.7 Applications Figure 22-3 shows a possible application voltage curve (typically for batteries). Over time, the device voltage decreases. When the device voltage equals voltage, VA, the LVD logic generates an interrupt. This occurs at time, TA. The application software then has the time, until the device voltage is no longer in valid operating range, to perform “housekeeping tasks” and to shut down the system. Voltage point, VB, is the minimum valid operating voltage specification. This occurs at time, TB. The difference, TB – TA, is the total time for shutdown. FIGURE 22-3: TYPICAL LOW-VOLTAGE DETECT APPLICATION TABLE 22-1: REGISTERS ASSOCIATED WITH LOW-VOLTAGE DETECT MODULE Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 LVDCON — — IRVST LVDEN LVDL3 LVDL2 LVDL1 LVDL0 INTCON GIE/GIEH PEIE/GIEL TMR0IE INT0IE RBIE TMR0IF INT0IF RBIF IPR2 OSCFIP — — EEIP —LVDIP — CCP2IP PIR2 OSCFIF — — EEIF —LVDIF — CCP2IF PIE2 OSCFIE — — EEIE —LVDIE — CCP2IE Legend: — = unimplemented, read as ‘0’. Shaded cells are unused by the LVD module. Time VA VB TA TB VA = LVD trip point VB = Minimum valid device operating voltage Legend : |
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