MC9S08GT16A Datasheet, PDF (276/300 Pages) Freescale Semiconductor, Inc – Microcontrollers

Electrical Characteristics
1 _{Self-clocked mode frequency is the frequency that the DCO generates when the FLL is open-loop.}
2 _{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.
3 _{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.
4 _{This parameter is characterized before qualification rather than 100% tested.}
5 _{Proper PC board layout procedures must be followed to achieve specifications.}
6 _{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.
7 _{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.
8 _{See Figure A-10}
0.1
–60
–40
–20
0
–0.1
80
100
120
20
40
60
–0.2
–0.3
–0.4
2V
–0.5
3V
–0.6
TEMPERATURE (°C)
Figure A-10. Internal Oscillator Deviation from Trimmed Frequency
A.10 AC Characteristics
This section describes ac timing characteristics for each peripheral system. For detailed information about
how clocks for the bus are generated, see Chapter 9, “Internal Clock Generator (S08ICGV4).”
MC9S08GT16A/GT8A Data Sheet, Rev. 1
276
Freescale Semiconductor