PIC16F1934-ESLASHML datasheet(116/418 Pages) MICROCHIP

116 / 418 page

PIC16F193X/LF193X

DS41364A-page 114

Preliminary

8.5.6

OSCTUNE REGISTER

The HFINTOSC and MFINTOSC are factory calibrated

but can be adjusted in software by writing to the

OSCTUNE register (Register 8-3).

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 oscillator

frequency will begin shifting to the new frequency. Code

execution continues during this shift. There is no

indication that the shift has occurred.

The OSCTUNE register applies the same adjustment to

both

the

HFINTOSC

and

the

MFINTOSC

simultaneously.

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-0/0

—

TUN5

TUN4

TUN3

TUN2

TUN1

TUN0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

u = bit is unchanged

x = Bit is unknown

-n/n = Value at POR and BOR/Value at all other Resets

‘1’ = Bit is set

‘0’ = Bit is cleared

bit 7-6

Unimplemented: Read as ‘0’

bit 5-0

TUN<4:0>: Frequency Tuning bits

011111

= Maximum frequency

011110

•

000001

000000

= Oscillator module is running at the factory-calibrated frequency.

111111

•

100000

= Minimum frequency

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