PIC16F1936T-E/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F1936T-E/SO

28/40/44-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt XLP™ Technology

Microchip Technology 

PIC16F193X/LF193X

8.5.2 HFINTOSC

The High-Frequency Internal Oscillator (HFINTOSC) is

a factory calibrated 16 MHz internal clock source. The

frequency of the HFINTOSC can be altered via

software using the OSCTUNE register (Register 8-3).

The output of the HFINTOSC connects to a postscaler

and multiplexer (see Figure 8-1). One of nine

frequencies derived from the HFINTOSC can be

selected via software using the IRCF<3:0> bits of the

OSCCON register. See Section 8.5.7 “Frequency

Select Bits (IRCF)” for more information.

The HFINTOSC is enabled by:

• Configure the IRCF<3:0> bits for the desired HF

frequency (see Register 8-1), and

• FOSC<2:0> = 100, or

• Set the System Clock Source (SCS) bits of the

OSCCON register to ‘1x’

The High Frequency Internal Oscillator Ready bit

(HFIOFR) of the OSCSTAT register indicates when the

HFINTOSC is running and can be utilized.

The High Frequency Internal Oscillator Status Locked

bit (HFIOFL) of the OSCSTAT register indicates when

the HFINTOSC is running within 2% of its final value.

The High Frequency Internal Oscillator Status Stable

bit (HFIOFS) of the OSCSTAT register indicates when

the HFINTOSC is running within 0.5% of its final value.

8.5.3 MFINTOSC

The Medium-Frequency Internal Oscillator

(MFINTOSC) is a factory calibrated 500 kHz internal

clock source. The frequency of the MFINTOSC can be

altered via software using the OSCTUNE register

(Register 8-3).

The output of the MFINTOSC connects to a postscaler

and multiplexer (see Figure 8-1). One of nine

frequencies derived from the MFINTOSC can be

selected via software using the IRCF<3:0> bits of the

OSCCON register. See Section 8.5.7 “Frequency

Select Bits (IRCF)” for more information.

The MFINTOSC is enabled by:

• Configure the IRCF<3:0> bits for the desired HF

frequency (see Register 8-1), and

• FOSC<2:0> = 100, or

• Set the System Clock Source (SCS) bits of the

OSCCON register to ‘1x’

The Medium Frequency Internal Oscillator Ready bit

(MFIOFR) of the OSCSTAT register indicates when the

MFINTOSC is running and can be utilized.

8.5.4 LFINTOSC

The Low-Frequency Internal Oscillator (LFINTOSC) is

an uncalibrated 31 kHz internal clock source.

The output of the LFINTOSC connects to a postscaler

and multiplexer (see Figure 8-1). Select 31 kHz, via

software, using the IRCF<2:0> bits of the OSCCON

register. See Section 8.5.7 “Frequency Select Bits

(IRCF)” for more information. The LFINTOSC is also the

frequency for the Power-up Timer (PWRT), Watchdog

Timer (WDT) and Fail-Safe Clock Monitor (FSCM).

The LFINTOSC is enabled by selecting 31 kHz

(IRCF<3:0> bits of the OSCCON register = 000) as the

system clock source (SCS bits of the OSCCON

register = 1x), or when any of the following are

enabled:

• Configure the IRCF<3:0> bits for the desired LF

frequency (see Register 8-1), and

• FOSC<2:0> = 100, or

• Set the System Clock Source (SCS) bits of the

OSCCON register to ‘1x’

Peripherals that use the LFINTOSC are:

• LCD

• Power-up Timer (PWRT)

• Watchdog Timer (WDT)

• Fail-Safe Clock Monitor (FSCM)

The Low Frequency Internal Oscillator Ready bit

(LFIOFR) of the OSCSTAT register indicates when the

LFINTOSC is running and can be utilized.

DS41364B-page 112

Preliminary

© 2009 Microchip Technology Inc.

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