SE33 datasheet(72/478 Pages) MICROCHIP

Part #	SE33

Description	64-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt XLP Technology

PDF	478 Pages

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Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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72 / 478 page

PIC16(L)F1946/47

DS41414D-page 72

 2010-2012 Microchip Technology Inc.

5.4.2

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<3:0>

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.

5.4.3

CHECKING TWO-SPEED CLOCK

STATUS

Checking the state of the OSTS bit of the OSCSTAT

from the external clock source, as defined by the

FOSC<2:0> bits in the Configuration Words, or the

internal oscillator.

FIGURE 5-8:

TWO-SPEED START-UP

1022 1023

PC + 1

TOST

INTOSC

OSC1

OSC2

Program Counter

System Clock

PC - N

SE33 Datasheet(PDF) 72 Page - Microchip Technology