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PIC18LF26J53 Datasheet(PDF) 61 Page - Microchip Technology |
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PIC18LF26J53 Datasheet(HTML) 61 Page - Microchip Technology |
61 / 586 page 2010 Microchip Technology Inc. Preliminary DS39964B-page 61 PIC18F47J53 FAMILY 4.7 Ultra Low-Power Wake-up The Ultra Low-Power Wake-up (ULPWU) on RA0 allows a slow falling voltage to generate an interrupt-on-change without excess current consumption. Follow these steps to use this feature: 1. Configure a remappable output pin to output the ULPOUT signal. 2. Map an INTx interrupt-on-change input function to the same pin as used for the ULPOUT output func- tion. Alternatively, in step 1, configure ULPOUT to output onto a PORTB interrupt-on-change pin. 3. Charge the capacitor on RA0 by configuring the RA0 pin to an output and setting it to ‘1’. 4. Enable interrupt-on-change (PIE bit) for the corresponding pin selected in step 2. 5. Stop charging the capacitor by configuring RA0 as an input. 6. Discharge the capacitor by setting the ULPEN and ULPSINK bits in the WDTCON register. 7. Configure Sleep mode. 8. Enter Sleep mode. When the voltage on RA0 drops below VIL, an interrupt will be generated, which will cause the device to wake-up and execute the next instruction. This feature provides a low-power technique for periodically waking up the device from Sleep mode. The time-out is dependent on the discharge time of the RC circuit on RA0. When the ULPWU module causes the device to wake-up from Sleep mode, the ULPLVL (WDTCON<5>) bit is set. When the ULPWU module causes the device to wake-up from Deep Sleep, the DSULP (DSWAKEL<5>) bit is set. Software can check these bits upon wake-up to determine the wake-up source. Also in Sleep mode, only the remappable output function, ULPWU, will output this bit value to an RPn pin for externally detecting wake-up events. See Example 4-1 for initializing the ULPWU module. Note: For module related bit definitions, see the WDTCON register in Section 28.2 “Watchdog Timer (WDT)” and the DSWAKEL register (Register 4-6). |
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