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EMK310 Additional notes XC866 timing From XC866 datasheet

EMK310 Additional notes XC866 timing From XC866 datasheet. Timing with internal osc = 10 MHz. Different clock frequencies. Thus…. The internal oscillator runs at f osc = 10 MHz The XC866 system frequency f sys = 80 MHz (refer to page 2 for equation)

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EMK310 Additional notes XC866 timing From XC866 datasheet

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  1. EMK310Additional notesXC866 timingFrom XC866 datasheet

  2. Timing with internal osc = 10 MHz

  3. Different clock frequencies

  4. Thus… • The internal oscillator runs at fosc = 10 MHz • The XC866 system frequency fsys = 80 MHz (refer to page 2 for equation) • Other clock sources derived from fsys usually by dividing by 3. • Clock relevant for Timers is peripheral clock fPCLK = 26.7 MHz • Clock relevant for instructions is CPU clock fCCLK = 26.7 MHz

  5. Baud rate calculation for 9600 BAUD • fPCLK = 26.7 MHz • PRE = 1 • BAUD rate = 9600 • BG = fPCLK /(baud rate x 16 x PRE) – 1 = 26.7e6 /(9600 x 16 x 1) – 1 = 173 = ADh

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