PIC12F683 datasheet(25/148 Pages) MICROCHIP

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

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

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.

OSCTUNE – OSCILLATOR TUNING RESISTOR (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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