PIC16LF1503 datasheet(50/340 Pages) MICROCHIP

50 / 340 page

PIC16(L)F1503

DS41607A-page 50

Preliminary

 2011 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 oscil-

lator delays are shown in Table 5-2.

TABLE 5-1:

OSCILLATOR SWITCHING DELAYS

Switch From

Switch To

Frequency

Oscillator Delay

Sleep/POR

LFINTOSC

HFINTOSC

31 kHz

31.25kHz-16MHz

2 cycles

Sleep/POR

DC – 20 MHz

2 cycles

LFINTOSC

DC – 20 MHz

1 cycle of each

Any clock source

HFINTOSC

31.25 kHz-16 MHz

s (typical)

Any clock source

LFINTOSC

31 kHz

1 cycle of each

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