PIC12LF1552 datasheet(68/356 Pages) MICROCHIP

68 / 356 page

PIC16LF1566/1567

DS40001817B-page 68

Preliminary

 2015-2016 Microchip Technology Inc.

5.3

Clock Switching

The system clock source can be switched between

external and internal clock sources via software using

the System Clock Select (SCS) bits of the OSCCON

using the SCS bits:

• Default system oscillator determined by FOSC

bits in Configuration Words

• Internal Oscillator Block (INTOSC)

5.3.1

SYSTEM CLOCK SELECT (SCS)

BITS

The System Clock Select (SCS) bits of the OSCCON

the CPU and peripherals.

• When the SCS bits of the OSCCON register = 00,

the system clock source is determined by value of

the FOSC<1:0> bits in the Configuration Words.

• When the SCS bits of the OSCCON register = 1x,

the system clock source is chosen by the internal

oscillator frequency selected by the IRCF<3:0>

bits of the OSCCON register. After a Reset, the

SCS bits of the OSCCON register are always

cleared.

When switching between clock sources, a delay is

required to allow the new clock to stabilize. These

oscillator delays are shown in Table 5-1.

TABLE 5-1:

OSCILLATOR SWITCHING DELAYS

Switch From

Switch To

Frequency

Oscillator Delay

Sleep

LFINTOSC(1)

MFINTOSC(1)

HFINTOSC(1)

31 kHz

31.25 kHz-500 kHz

31.25kHz-16MHz

Oscillator Warm-Up Delay TWARM(2)

Sleep/POR

EC(1)

DC – 32 MHz

2 cycles

LFINTOSC

EC(1)

DC – 32 MHz

1 cycle of each

Any clock source

MFINTOSC(1)

HFINTOSC

31.25 kHz-500 MHz

31.25kHz-16MHz

s (approx.)

Any clock source

LFINTOSC

31 kHz

1 cycle of each

PLL inactive

PLL active

16-32 MHz

2 ms (approx.)

Note 1:

PLL inactive

See Section 25.0 “Electrical Specifications”

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