PIC16F1513-I/SP 查看數據表（PDF） - Microchip Technology

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PIC16F1513-I/SP

28-Pin Flash Microcontrollers with 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)F1512/3

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 Words, or the

internal oscillator.

PC + 1

 2012-2014 Microchip Technology Inc.

DS40001624C-page 51

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