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PIC18F23K20-E/ML Datasheet(PDF) 289 Page - Microchip Technology |
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PIC18F23K20-E/ML Datasheet(HTML) 289 Page - Microchip Technology |
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289 / 420 page  © 2007 Microchip Technology Inc. Advance Information DS41303B-page 287 PIC18F2XK20/4XK20 22.5 Applications In many applications, the ability to detect a drop below, or rise above, a particular threshold is desirable. For example, the HLVD module could be periodically enabled to detect Universal Serial Bus (USB) attach or detach. This assumes the device is powered by a lower voltage source than the USB when detached. An attach would indicate a high-voltage detect from, for example, 3.3V to 5V (the voltage on USB) and vice versa for a detach. This feature could save a design a few extra components and an attach signal (input pin). For general battery applications, Figure 22-4 shows a possible voltage curve. Over time, the device voltage decreases. When the device voltage reaches voltage VA, the HLVD logic generates an interrupt at time TA. The interrupt could cause the execution of an ISR, which would allow the application to perform “housekeeping tasks” and perform a controlled shutdown before the device voltage exits the valid operating range at TB. The HLVD, thus, would give the application a time window, represented by the difference between TA and TB, to safely exit. FIGURE 22-4: TYPICAL LOW-VOLTAGE DETECT APPLICATION TABLE 22-1: REGISTERS ASSOCIATED WITH HIGH/LOW-VOLTAGE DETECT MODULE Time VA VB TA TB VA = HLVD trip point VB = Minimum valid device operating voltage Legend: Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Reset Values on Page HLVDCON VDIRMAG — IRVST HLVDEN HLVDL3 HLVDL2 HLVDL1 HLVDL0 58 INTCON GIE/GIEH PEIE/GIEL TMR0IE INT0IE RBIE TMR0IF INT0IF RBIF 57 PIR2 OSCFIF C1IF C2IF EEIF BCLIF HLVDIF TMR3IF CCP2IF 60 PIE2 OSCFIE C1IE C2IE EEIE BCLIE HLVDIE TMR3IE CCP2IE 60 IPR2 OSCFIP C1IP C2IP EEIP BCLIP HLVDIP TMR3IP CCP2IP 60 Legend: — = unimplemented, read as ‘0’. Shaded cells are unused by the HLVD module. |
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