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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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68HC05PL4 датащи(PDF) 50 Page - Freescale Semiconductor, Inc |
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68HC05PL4 датащи(HTML) 50 Page - Freescale Semiconductor, Inc |
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50 / 98 page  GENERAL RELEASE SPECIFICATION April 30, 1998 SYSTEM CLOCKS MC68HC05PL4 8-2 REV 2.0 FMODE — Fast Mode RC select FMODE selects the oscillating frequency of the internal RC. After power-on- reset, the default setting is 500kHz. 1 = Internal RC oscillates at 500kHz 0 = Internal RC oscillates at 20kHz OSCF — OSC running Flag This bit is set when the external clock (External/crystal) from OSC1 is on. See also CKOSC bit below. RCF — RC Running Flag This bit is set when the internal RC clock is on. CKOSC — ChecK OSC The CKOSC bit enables the internal logic for external clock selection. The pro- cedure below should be followed when switching from RC to external clock. 1. Set the CKSEL1 and CKSEL2 bits for external clock source. 2. If crystal option is used — set the 8-bit timer for counting crystal stabilization delay (typically 4064 clock cycles). 3. Write a “1” to the CKOSC bit and check for OSCF bit set. 4. If the OSCF bit is not set, no external clock is available, the internal RC clock will be used as the system clock, irrespective of the setting for CKSEL1 and CKSEL2. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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