MC9S08AC60 Datasheet, PDF (319/348 Pages) Freescale Semiconductor, Inc – Microcontrollers

Appendix A Electrical Characteristics and Timing Specifications
3 _{Loss of reference frequency is the reference frequency detected internally, which transitions the ICG into self-clocked mode if it}
is not in the desired range.
4 _{Loss of DCO frequency is the DCO frequency detected internally, which transitions the ICG into FLL bypassed external mode}
(if an external reference exists) if it is not in the desired range.
5 _{This parameter is characterized before qualification rather than 100% tested.}
6 _{Proper PC board layout procedures must be followed to achieve specifications.}
7 _{This specification applies to the period of time required for the FLL to lock after entering FLL engaged internal or external modes.}
If a crystal/resonator is being used as the reference, this specification assumes it is already running.
8 _{Jitter is the average deviation from the programmed frequency measured over the specified interval at maximum fICGOUT.}
Measurements are made with the device powered by filtered supplies and clocked by a stable external clock signal. Noise
injected into the FLL circuitry via V_DDA and V_SSA and variation in crystal oscillator frequency increase the C_Jitter percentage for
a given interval.
9 _{See Figure A-9.}
Average of Percentage Error
Variable
3V
5V
Figure A-9. Internal Oscillator Deviation from Trimmed Frequency
MC9S08AC60 Series Data Sheet, Rev. 2
Freescale Semiconductor
319