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PIC16F720-E/SS データシート(PDF) 70 Page - Microchip Technology |
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PIC16F720-E/SS データシート(HTML) 70 Page - Microchip Technology |
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70 / 244 page  PIC16F/LF720/721 DS41430A-page 70 2010 Microchip Technology Inc. 7.5 Oscillator Tuning The INTOSC is factory calibrated but can be adjusted in software by writing to the OSCTUNE register (Register 7-2). The default value of the OSCTUNE register is ‘0’. The value is a 6-bit two’s complement number. When the OSCTUNE register is modified, the INTOSC frequency will begin shifting to the new frequency. Code execution continues during this shift. There is no indication that the shift has occurred. REGISTER 7-2: OSCTUNE: OSCILLATOR TUNING REGISTER U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 — — TUN5 TUN4 TUN3 TUN2 TUN1 TUN0 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 7-6 Unimplemented: Read as ‘0’ bit 5-0 TUN<5:0>: Frequency Tuning bits 01 1111 = Maximum frequency 01 1110 = • • • 00 0001 = 00 0000 = Oscillator module is running at the factory-calibrated frequency. 11 1111 = • • • 10 0000 = Minimum frequency |
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