PIC16F1526-IPT View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F1526-IPT

64-Pin Flash Microcontrollers with nanoWatt XLP Technology

Microchip Technology 

5.4.2

TWO-SPEED START-UP

SEQUENCE

1. Wake-up from Power-on Reset or Sleep.

2. Instructions begin execution by the internal

oscillator at the frequency set in the IRCF<3:0>

bits of the OSCCON register.

3. OST enabled to count 1024 clock cycles.

4. OST timed out, wait for falling edge of the

internal oscillator.

5. OSTS is set.

6. System clock held low until the next falling edge

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

7. System clock is switched to external clock

source.

FIGURE 5-8:

TWO-SPEED START-UP

INTOSC

TOST

OSC1 0 1 1022 1023

OSC2

Program Counter

PC - N

PC

System Clock

PIC16(L)F1526/27

5.4.3

CHECKING TWO-SPEED CLOCK

STATUS

Checking the state of the OSTS bit of the OSCSTAT

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 1, or the

internal oscillator.

PC + 1

 2011 Microchip Technology Inc.

Preliminary

DS41458B-page 61

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