PIC16F15213 datasheet(80/439 Pages) MICROCHIP

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11.2.2.1.1 HFINTOSC Frequency Tuning

The HFINTOSC frequency can be fine-tuned via the HFINTOSC Frequency Tuning Register (OSCTUNE). The

OSCTUNE register provides small adjustments to the HFINTOSC nominal frequency.

The OSCTUNE register contains the HFINTOSC Frequency Tuning (TUN) bits. The TUN bits default to a 6-bit, two’s

compliment value of 0x00, which indicates that the oscillator is operating at the selected frequency. When a value

between 0x01 and 0x1F is written to the TUN bits, the HFINTOSC frequency is increased. When a value between

0x3F and 0x20 is written to the TUN bits, the HFINTOSC frequency is decreased.

When the OSCTUNE register is modified, the oscillator will begin to shift to the new frequency. Code execution

continues during this shift. There is no indication that the frequency shift occurred.

Important: OSCTUNE tuning does not affect the LFINTOSC frequency.

11.2.2.2 MFINTOSC

The Medium-Frequency Internal Oscillator (MFINTOSC) generates two constant clock outputs (500 kHz and 31.25

kHz). The MFINTOSC clock signals are created from the HFINTOSC using dynamic divider logic, which provides

constant MFINTOSC clock rates regardless of selected HFINTOSC frequency.

The MFINTOSC cannot be used as the system clock, but can be used as a clock source for certain peripherals, such

as a Timer.

11.2.2.3 SFINTOSC

The Specified Frequency Internal Oscillator (SFINTOSC) generates a 1 MHz output clock. The SFINTOSC clock

signal is created from the HFINTOSC using dynamic divider logic, which provides a constant SFINTOSC clock rate

regardless of the selected HFINTOSC frequency.

The SFINTOSC cannot be used as the system clock, but may be selected as a clock source for certain peripherals,

such as a Timer.

11.2.2.4 LFINTOSC

The Low-Frequency Internal Oscillator (LFINTOSC) is a factory-calibrated 31 kHz internal clock source.

The LFINTOSC can be used as a system clock source, and may be used by certain peripheral modules as a clock

source. Additionally, the LFINTOSC provides a time base for the following:

• Power-up Timer (PWRT)

• Watchdog Timer (WDT)

The LFINTOSC is enabled by programming the RSTOSC Configuration bits to select LFINTOSC.

11.2.2.5 ADCRC

The Analog-to-Digital RC (ADCRC) oscillator is dedicated to the ADC module. This oscillator is also referred to as the

FRC clock. The ADCRC operates at a fixed frequency of approximately 600 kHz, and is used as a conversion clock

source. The ADCRC allows the ADC module to operate in Sleep mode, which can reduce system noise during the

ADC conversion. The ADCRC is automatically enabled when it is selected as the clock source for the ADC module,

or when selected as the clock source of any peripheral that may use it. The ADCRC may also be manually enabled

via the ADC Oscillator Enable (ADOEN) bit, thereby avoiding start-up delays when this source is used intermittently.

11.2.3

Oscillator Status and Manual Enable

The Oscillator Status (OSCSTAT) register displays the Ready status for each of the following oscillators:

• HFINTOSC

• MFINTOSC

• LFINTOSC

• ADCRC

• SFINTOSC

PIC16F15213/14/23/24/43/44

OSC - Oscillator Module

and its subsidiaries

Data Sheet

DS40002195E-page 80

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