PIC16F636TESLASHMF datasheet(35/196 Pages) MICROCHIP

35 / 196 page

Preliminary

DS41232B-page 33

PIC12F635/PIC16F636/639

3.4.2.1

OSCTUNE Register

The HFINTOSC is factory calibrated but can be

adjusted in software by writing to the OSCTUNE

The OSCTUNE register has a tuning range of

approximately

±12%.

The

default

value

the

OSCTUNE register is ‘0’. The value is a 5-bit two’s

complement number. Due to process variation, the

monotonicity and frequency step cannot be specified.

When

the

OSCTUNE

modified,

the

HFINTOSC frequency will begin shifting to the new

frequency. 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.

OSCTUNE – OSCILLATOR TUNING REGISTER (ADDRESS: 90h)

U-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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