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PIC16LF1824 Datasheet(PDF) 62 Page - Microchip Technology |
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PIC16LF1824 Datasheet(HTML) 62 Page - Microchip Technology |
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62 / 440 page  PIC16(L)F1847 DS40001453D-page 62 Preliminary 2011-2013 Microchip Technology Inc. 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. 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. FIGURE 5-8: TWO-SPEED START-UP 0 1 1022 1023 PC + 1 TOST T INTOSC OSC1 OSC2 Program Counter System Clock PC - N PC |
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