PIC16F882_12 datasheet(74/338 Pages) MICROCHIP

Part #	PIC16F882

Description	28/40/44-Pin Flash-Based, 8-Bit CMOS Microcontrollers

PDF	338 Pages

Scroll/Zoom	100%

Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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74 / 338 page

PIC16F882/883/884/886/887

DS41291G-page 74

 2006-2012 Microchip Technology Inc.

4.7.2

TWO-SPEED START-UP

SEQUENCE

Wake-up from Power-on Reset or Sleep.

Instructions begin execution by the internal

oscillator at the frequency set in the IRCF<2:0>

bits of the OSCCON register.

OST enabled to count 1024 clock cycles.

OST timed out, wait for falling edge of the

internal oscillator.

OSTS is set.

System clock held low until the next falling edge

of new clock (LP, XT or HS mode).

System clock is switched to external clock

source.

4.7.3

CHECKING TWO-SPEED CLOCK

STATUS

Checking the state of the OSTS bit of the OSCCON

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

1022 1023

PC + 1

TOST

HFINTOSC

OSC1

OSC2

Program Counter

System Clock

PC - N

PIC16F882 Datasheet(PDF) 74 Page - Microchip Technology