PIC16F887 datasheet(72/288 Pages) MICROCHIP

Part #	PIC16F887

Description	28/40/44-Pin, Enhanced Flash-Based 8-Bit CMOS Microcontrollers with nanoWatt Technology

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Manufacturer	MICROCHIP [Microchip Technology]

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PIC16F882/883/884/886/887

41291D-page 70

Preliminary

4.7.3

CHECKING TWO-SPEED CLOCK

STATUS

Checking the state of the OSTS bit of the OSCCON

register will confirm if the microcontroller is running

from the external clock source, as defined by the

FOSC<2:0> bits in the Configuration Word Register 1

(CONFIG1), or the internal oscillator.

FIGURE 4-7:

TWO-SPEED START-UP

0

1

1022 1023

PC + 1

TOST

T

HFINTOSC

OSC1

OSC2

Program Counter

System Clock

PC - N

PC

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