PIC16F18344-ISLASHSS datasheet(82/489 Pages) MICROCHIP

82 / 489 page

PIC16(L)F18324/18344

DS40001800C-page 82

 2015-2017 Microchip Technology Inc.

7.2.2.3

Internal Oscillator Frequency

Adjustment

The HFINTOSC and LFINTOSC internal oscillators are

both factory-calibrated. The HFINTOSC oscillator can

be adjusted in software by writing to the OSCTUNE

LFINTOSC frequency.

The default value of the OSCTUNE register is 00h. The

value is a 6-bit two’s complement number. A value of

1Fh will provide an adjustment to the maximum

frequency. A value of 20h will provide an adjustment to

the minimum frequency.

When the OSCTUNE register is modified, the

HFINTOSC oscillator frequency will begin shifting to the

new frequency. Code execution continues during this

shift. There is no indication that the shift has occurred.

7.2.2.4

LFINTOSC

The Low-Frequency Internal Oscillator (LFINTOSC) is

a factory calibrated 31 kHz internal clock source.

The LFINTOSC is the clock source for the Power-up

Timer (PWRT), Watchdog Timer (WDT) and Fail-Safe

Clock Monitor (FSCM). The LFINTOSC can also be

used as the system clock, or as a clock or input source

to certain peripherals.

The LFINTOSC is selected as the clock source through

one of the following methods:

• Programming the RSTOSC<2:0> bits of

Configuration Word 1 to enable LFINTOSC.

• Write to the NOSC<2:0> bits of the OSCCON1

7.2.2.5

Oscillator Status and Manual Enable

The ‘ready’ status of each oscillator is displayed in the

OSCSTAT1 register (Register 7-4). The oscillators can

also be manually enabled through the OSCEN register

(Register 7-5). Manual enables make it possible to

verify the operation of the EXTOSC or SOSC crystal

oscillators. This can be achieved by enabling the

selected oscillator, then watching the corresponding

‘ready’ state of the oscillator in the OSCSTAT1 register.

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