PIC16F882_12 datasheet(70/338 Pages) MICROCHIP

70 / 338 page

PIC16F882/883/884/886/887

DS41291G-page 70

 2006-2012 Microchip Technology Inc.

4.5.2.1

OSCTUNE Register

The HFINTOSC is factory calibrated but can be

adjusted in software by writing to the OSCTUNE

The default value of the OSCTUNE register is ‘0’. The

value is a 5-bit two’s complement number.

When the OSCTUNE register is modified, the

HFINTOSC frequency will begin shifting to the new

frequency. 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.

OSCTUNE: OSCILLATOR TUNING REGISTER

U-0

R/W-0

—

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 7-5

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 factory-calibrated frequency.

11111 =

•

10000 = Minimum frequency

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