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PIC12F683 Datasheet(PDF) 25 Page - Microchip Technology |
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PIC12F683 Datasheet(HTML) 25 Page - Microchip Technology |
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25 / 148 page  2004 Microchip Technology Inc. Preliminary DS41211B-page 23 PIC12F683 3.4.2.1 OSCTUNE Register The HFINTOSC is factory calibrated but can be adjusted in software by writing to the OSCTUNE register (Register 3-1). The OSCTUNE register has a tuning range of ±12%. The default value of the OSCTUNE register is ‘0’. The value is a 5-bit two’s complement number. Due to pro- cess variation, the monotonicity and frequency step cannot be specified. When the OSCTUNE register is modified, the HFINTOSC frequency will begin shifting to the new fre- quency. The HFINTOSC clock will stabilize within 1 ms. Code execution continues during this shift. There is no indication that the shift has occurred. OSCTUNE does not affect the LFINTOSC frequency. Operation of features that depend on the LFINTOSC clock source frequency, such as the Power-up Timer (PWRT), Watchdog Timer (WDT), Fail-Safe Clock Monitor (FSCM) and peripherals, are not affected by the change in frequency. REGISTER 3-1: OSCTUNE – OSCILLATOR TUNING RESISTOR (ADDRESS: 90h) U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 — — — TUN4 TUN3 TUN2 TUN1 TUN0 bit 7 bit 0 bit 7-5 Unimplemented: Read as ‘0’ bit 4-0 TUN<4:0>: Frequency Tuning bits 01111 = Maximum frequency 01110 = • • • 00001 = 00000 = Oscillator module is running at the calibrated frequency. 11111 = • • • 10000 = Minimum frequency 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 |
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