PIC12F635ESS datasheet(42/234 Pages) MICROCHIP

42 / 234 page

PIC12F635/PIC16F636/639

DS41232D-page 40

3.5.2.1

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

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 calibrated frequency.

11111

•

10000

= Minimum frequency

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