PIC16F1459-ESSQTP datasheet(70/418 Pages) MICROCHIP

部件名	PIC16F1459-ESSQTP

功能描述	14/20-Pin Flash, 8-Bit USB Microcontrollers with XLP Technology

PDF	418 Pages

Scroll/Zoom	100%

制造商	MICROCHIP [Microchip Technology]

网页	http://www.microchip.com

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70 / 418 page

PIC16(L)F1454/5/9

DS41639A-page 70

Preliminary

 2012 Microchip Technology Inc.

5.6.2

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.

5.6.3

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

PIC16F1459-ESSQTP 数据表(PDF) 70 Page - Microchip Technology

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