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PORTGPA Datasheet(PDF) 82 Page - Microchip Technology |
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PORTGPA Datasheet(HTML) 82 Page - Microchip Technology |
82 / 222 page MCP19111 DS22331A-page 82 2013 Microchip Technology Inc. 13.3.1 OSCILLATOR DELAY UPON POWER-UP, WAKE-UP AND BASE FREQUENCY CHANGE In applications where the OSCTUNE register is used to shift the frequency of the internal oscillator, the application should not expect the frequency of the internal oscillator to stabilize immediately. In this case, the frequency may shift gradually toward the new value. The time for this frequency shift is less than eight cycles of the base frequency. On power up, the device is held in reset by the power-up time, if the power-up timer is enabled. Following a wake-up from Sleep mode or POR, an internal delay of ~10 µs is invoked to allow the memory bias to stabilize before program execution can begin. TABLE 13-1: SUMMARY OF REGISTERS ASSOCIATED WITH CLOCK SOURCES Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Register on Page OSCTUNE — — — TUN4 TUN3 TUN2 TUN1 TUN0 81 Legend: — = unimplemented locations read as ‘0’. Shaded cells are not used by clock sources. TABLE 13-2: SUMMARY OF CALIBRATION WORD ASSOCIATED WITH CLOCK SOURCES Name Bits Bit -/7 Bit -/6 Bit 13/5 Bit 12/4 Bit 11/3 Bit 10/2 Bit 9/1 Bit 8/0 Register on Page CALWD1 13:8 — — — — DOV3 DOV2 DOV1 DOV0 57 7:0 — FCAL6 FCAL5 FCAL4 FCAL3 FCAL2 FCAL1 FCAL0 Legend: — = unimplemented locations read as ‘0’. Shaded cells are not used by clock sources. |
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