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DSPIC33FJ64GP706 数据表(PDF) 146 Page - Microchip Technology |
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DSPIC33FJ64GP706 数据表(HTML) 146 Page - Microchip Technology |
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146 / 322 page  dsPIC33FJXXXGPX06/X08/X10 DS70286C-page 144 © 2009 Microchip Technology Inc. REGISTER 9-4: OSCTUN: FRC OSCILLATOR TUNING REGISTER U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0 — — — — — — — — bit 15 bit 8 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 — — TUN<5:0>(1) bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 15-6 Unimplemented: Read as ‘0’ bit 5-0 TUN<5:0>: FRC Oscillator Tuning bits(1) 011111 = Center frequency + 11.625% (8.23 MHz) 011110 = Center frequency + 11.25% (8.20 MHz) • • • 000001 = Center frequency + 0.375% (7.40 MHz) 000000 = Center frequency (7.37 MHz nominal) 111111 = Center frequency - 0.375% (7.345 MHz) • • • 100001 = Center frequency - 11.625% (6.52 MHz) 100000 = Center frequency - 12% (6.49 MHz) Note 1: OSCTUN functionality has been provided to help customers compensate for temperature effects on the FRC frequency over a wide range of temperatures. The tuning step size is an approximation and is neither characterized nor tested. |
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