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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC18F23K22-E/ML датащи(PDF) 43 Page - Microchip Technology |
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PIC18F23K22-E/ML датащи(HTML) 43 Page - Microchip Technology |
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43 / 496 page  2010 Microchip Technology Inc. Preliminary DS41412C-page 43 PIC18(L)F2X/4XK22 2.10.2 TWO-SPEED START-UP SEQUENCE 1. Wake-up from Power-on Reset or Sleep. 2. Instructions begin executing by the internal oscillator at the frequency set in the IRCF<2:0> bits of the OSCCON register. 3. OST enabled to count 1024 external clock cycles. 4. OST timed out. External clock is ready. 5. OSTS is set. 6. Clock switch finishes according to Figure 2-9 2.10.3 CHECKING TWO-SPEED CLOCK STATUS Checking the state of the OSTS bit of the OSCCON register will confirm if the microcontroller is running from the external clock source, as defined by the FOSC<2:0> bits in CONFIG1H Configuration register, or the internal oscillator. OSTS = 0 when the external oscillator is not ready, which indicates that the system is running from the internal oscillator. FIGURE 2-9: CLOCK SWITCH TIMING Old Clock New Clock IRCF <2:0> System Clock Start-up Time(1) Clock Sync Running High Speed Low Speed Select Old Select New New Clk Ready Low Speed High Speed Old Clock New Clock IRCF <2:0> System Clock Start-up Time(1) Clock Sync Running Select Old Select New New Clk Ready Note 1: Start-up time includes TOST (1024 TOSC) for external clocks, plus TPLL (approx. 2 ms) for HSPLL mode. |
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