PIC16F917ESLASHML301 datasheet(78/272 Pages) MICROCHIP

78 / 272 page

PIC16F917/916/914/913

DS41250E-page 76

Preliminary

4.4.2.1

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

process variation, the monotonicity and frequency step

cannot be specified.

When the OSCTUNE register is 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 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

= Center frequency. 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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