mc9s08ac128 Freescale Semiconductor, Inc, mc9s08ac128 Datasheet - Page 26

• Manufacturer Part Number: mc9s08ac128
• Description: 8-bit Hcs08 Central Processor Unit Cpu
• Manufacturer: Freescale Semiconductor, Inc

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Chapter 3 Electrical Characteristics and Timing Specifications
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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.
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.
This parameter is characterized before qualification rather than 100% tested.
Proper PC board layout procedures must be followed to achieve specifications.
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.
Jitter is the average deviation from the programmed frequency measured over the specified interval at maximum f
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
a given interval.
See
Figure 3-9
Figure 3-9. Internal Oscillator Deviation from Trimmed Frequency
Average of Percentage Error
DDA
and V
MC9S08AC128 Series Data Sheet, Rev. 1
SSA
Preliminary — Subject to Change
and variation in crystal oscillator frequency increase the C
Variable
Freescale Semiconductor
3 V
5 V
Jitter
percentage for
ICGOUT
.