MC9S08SF4 Datasheet, PDF (17/32 Pages) Freescale Semiconductor, Inc – Technical Data

AC Characteristics
1 _{Data in Typical column was characterized at 5.0 V, 25 °C or is typical recommended value.}
2 _{This parameter is characterized and not tested on each device.}
3 _{This specification applies to any time the FLL reference source or reference divider is changed, trim value changed,}
DMX32 bit is changed, DRS bit is changed, or changing from FLL disabled (FBELP, FBILP) to FLL enabled (FEI,
FEE, FBE, FBI). If a crystal/resonator is being used as the reference, this specification assumes it is already running.
4 _{Jitter is the average deviation from the programmed frequency measured over the specified interval at maximum fBus.}
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_DD and V_SS and variation in crystal oscillator frequency increase the C_Jitter
percentage for a given interval.
1.00%
0.50%
0.00%
-60
-40
-20
0
-0.50%
-1.00%
20
40
60
TBD
80
100
120
-1.50%
-2.00%
Temperature
Figure 13. Deviation of DCO Output from Trimmed Frequency (20 MHz, 5.0 V)
3.9 AC Characteristics
This section describes AC timing characteristics for each peripheral system.
MC9S08SF4 Series MCU Data Sheet, Rev. 2
Freescale Semiconductor
17